uiDrawManager/uiDrawManager.cpp

//-
// ==========================================================================
// Copyright 2015 Autodesk, Inc.  All rights reserved.
//
// Use of this software is subject to the terms of the Autodesk
// license agreement provided at the time of installation or download,
// or which otherwise accompanies this software in either electronic
// or hard copy form.
// ==========================================================================
//+

// Plugin: uiDrawManager.cpp

// This plugin demonstrates the use of MUIDrawManager.
//
// It provides the 'uiDrawManager' node which uses MUIDrawManager to display 3D (world coordinates)
// or 2D (screen coordinates) primitives such as text, lines, spheres, etc, based on values set
// on its attributes.
//
// For example, to draw a 2D, 15x30 pixel rectangle in the viewport, centered on pixel position
// (50, 20) and tilted at a 45 degree angle, you would do the following:
// createNode -n testo uiDrawManager;
// setAttr testo.draw2D true;
// setAttr testo.rectScale -type double 2 15 30;
// setAttr testo.position -type double 3 50 20 0;
// setAttr testo.rectUp -type double3 1 1 0;

#include <maya/MPxLocatorNode.h>
#include <maya/MFnPlugin.h>
#include <maya/MFnEnumAttribute.h>
#include <maya/MFnNumericAttribute.h>
#include <maya/MFnTypedAttribute.h>
#include <maya/MFnStringData.h>
#include <maya/MFnPointArrayData.h>
#include <maya/MPointArray.h>
#include <maya/MUintArray.h>

// Viewport 2.0 includes
#include <maya/MDrawRegistry.h>
#include <maya/MPxDrawOverride.h>
#include <maya/MUserData.h>
#include <algorithm>

using namespace MHWRender;

class uiDrawManager : public MPxLocatorNode
{
public:
    enum EuiType {
        kText,
        kLine,
        kPoint,
        kRect,
        kQuad,
        kSphere,
        kCircle,
        kArc,
        kLineList,
        kPointList,
        kLineStrip,
        kIcon,
        kCone,
        kBox
    };

public:
    uiDrawManager();
    virtual ~uiDrawManager();

    static void*            creator();
    static MStatus            initialize();

    // ui type attribute
    static MObject            aUIType;

    // color
    static MObject            aPrimitiveColor;
    static MObject            aPrimitiveTransparency;

    // line width and line style attributes
    static MObject            aLineWidth;
    static MObject            aLineStyle;

    // fill attribute
    static MObject            aIsFilled;

    // shaded attribute
    static MObject            aShaded;

    // x-ray attribute
    static MObject            aXRay;

    // radius attribute
    static MObject            aRadius;

    // 2D attributes
    static MObject            aDraw2D;
    static MObject            aPosition;

    // WorldViewportConverter attribute
    static MObject            aWorldViewportConverter;

    // Text attributes
    static MObject            aTextAlignment;
    static MObject            eTextIncline;
    static MObject            aTextWeight;
    static MObject            aTextStretch;
    static MObject            aTextLine;
    static MObject            aTextBoxSize;
    static MObject            aText;
    static MObject            aTextBoxColor;
    static MObject            aTextBoxTransparency;
    static MObject            aTextFontSize;
    static MObject            aFontFaceName;

    // point attributes
    static MObject            aPointSize;

    // line attributes
    static MObject            aLineStartPoint;
    static MObject            aLineEndPoint;

    // rect attributes
    static MObject            aRectUp;
    static MObject            aRectNormal;
    static MObject            aRectScale;

    // quad attributes
    static MObject            aQuadVertex[4];

    // circle attributes
    static MObject            aCircleNormal;

    // arc attributes
    static MObject            aArcStart;
    static MObject            aArcEnd;
    static MObject            aArcNormal;

    // cone attributes
    static MObject          aConeDirection;
    static MObject          aConeHeight;

    // box attributes
    static MObject          aBoxUp;
    static MObject          aBoxRight;
    static MObject          aBoxScale;

    // icon attributes
    static MObject           aIconName;
    static MObject           aIconScale;
public:
    static    MTypeId        id;
    static    MString        drawDbClassification;
    static    MString        drawRegistrantId;
};

MObject uiDrawManager::aUIType;

MObject uiDrawManager::aPrimitiveColor;
MObject uiDrawManager::aPrimitiveTransparency;

MObject uiDrawManager::aLineWidth;
MObject uiDrawManager::aLineStyle;

MObject uiDrawManager::aIsFilled;

MObject uiDrawManager::aShaded;

MObject uiDrawManager::aXRay;

MObject uiDrawManager::aRadius;

MObject uiDrawManager::aDraw2D;
MObject uiDrawManager::aPosition;

MObject uiDrawManager::aWorldViewportConverter;

MObject uiDrawManager::aTextAlignment;
MObject uiDrawManager::eTextIncline;
MObject uiDrawManager::aTextWeight;
MObject uiDrawManager::aTextStretch;
MObject uiDrawManager::aTextLine;

MObject uiDrawManager::aTextBoxSize;
MObject uiDrawManager::aText;
MObject uiDrawManager::aTextBoxColor;
MObject uiDrawManager::aTextBoxTransparency;
MObject uiDrawManager::aTextFontSize;
MObject uiDrawManager::aFontFaceName;

MObject uiDrawManager::aPointSize;

MObject uiDrawManager::aLineStartPoint;
MObject uiDrawManager::aLineEndPoint;

MObject    uiDrawManager::aRectUp;
MObject    uiDrawManager::aRectNormal;
MObject    uiDrawManager::aRectScale;

MObject uiDrawManager::aQuadVertex[4];

MObject    uiDrawManager::aCircleNormal;

MObject    uiDrawManager::aArcStart;
MObject    uiDrawManager::aArcEnd;
MObject    uiDrawManager::aArcNormal;

MObject    uiDrawManager::aIconName;
MObject    uiDrawManager::aIconScale;

MObject    uiDrawManager::aConeDirection;
MObject    uiDrawManager::aConeHeight;

MObject    uiDrawManager::aBoxUp;
MObject    uiDrawManager::aBoxRight;
MObject    uiDrawManager::aBoxScale;

MTypeId uiDrawManager::id(0x0008002A);
MString    uiDrawManager::drawDbClassification("drawdb/geometry/uiDrawManager");
MString    uiDrawManager::drawRegistrantId("uiDrawManagerPlugin");

uiDrawManager::uiDrawManager() {}

uiDrawManager::~uiDrawManager() {}

void* uiDrawManager::creator()
{
    return new uiDrawManager();
}


//---------------------------------------------------------------------------
//---------------------------------------------------------------------------
// Viewport 2.0 override implementation
//---------------------------------------------------------------------------
//---------------------------------------------------------------------------
class uiDrawManagerData : public MUserData
{
public:
    uiDrawManagerData();
    virtual ~uiDrawManagerData() {};

    uiDrawManager::EuiType fUIType;

    MColor fColor;

    float fLineWidth;
    MUIDrawManager::LineStyle fLineStyle;

    bool fIsFilled;
    bool fShaded;
    bool fXRay;

    double fRadius;

    bool fDraw2D;
    bool fWorldViewportConverter;

    MPoint fPosition;

    // text
    MString fText;
    unsigned int fTextFontSize;
    unsigned int fFontFaceIndex;
    static MStringArray fFontList;

    MUIDrawManager::TextAlignment fTextAlignment;
    int fTextIncline;
    int fTextWeight;
    int fTextStretch;
    int fTextLine;

    int fTextBoxWidth;
    int fTextBoxHeight;
    MColor fTextBoxColor;

    // point
    float fPointSize;
    MPointArray fPoints;

    // line
    MPoint fLineStartPoint;
    MPoint fLineEndPoint;
    MPointArray fLines;

    // rect
    MVector fRectUp;
    MVector fRectNormal;
    double fRectScaleX;
    double fRectScaleY;

    // quad
    MPoint fQuadVertex[4];

    // circle
    MVector fCircleNormal;

    // arc
    MVector fArcStart;
    MVector fArcEnd;
    MVector fArcNormal;

    // icon
    float fIconScale;
    unsigned int fIconIndex;
    static MStringArray fIconList;

    // cone
    MVector fConeDirection;
    double  fConeHeight;

    // box
    MVector fBoxUp;
    MVector fBoxRight;
    MPoint  fBoxScale;
};

MStringArray uiDrawManagerData::fFontList;
MStringArray uiDrawManagerData::fIconList;

uiDrawManagerData::uiDrawManagerData() : MUserData(false)
    , fUIType(uiDrawManager::kText)
    , fColor(1.0f, 0.0f, 0.0f, 1.0f)
    , fLineWidth(2.0f)
    , fLineStyle(MUIDrawManager::kSolid)
    , fIsFilled(false)
    , fShaded(false)
    , fXRay(false)
    , fRadius(1.0)
    , fDraw2D(false)
    , fPosition(0.0, 0.0, 0.001)
    , fWorldViewportConverter(false)
    // text
    , fText("uiDrawManager-Text")
    , fTextFontSize(MUIDrawManager::kDefaultFontSize)
    , fFontFaceIndex(0)
    , fTextAlignment(MUIDrawManager::kLeft)
    , fTextIncline(MUIDrawManager::kInclineNormal)
    , fTextWeight(MUIDrawManager::kWeightBold)
    , fTextStretch(MUIDrawManager::kStretchUnstretched)
    , fTextLine(0)
    , fTextBoxWidth(0)
    , fTextBoxHeight(0)
    , fTextBoxColor(0.0f, 1.0f, 1.0f, 1.0f)
    // point
    , fPointSize(2.0f)
    // line
    , fLineStartPoint(0.0, 0.0, 0.0)
    , fLineEndPoint(1.0, 1.0, 1.0)
    // rect
    , fRectUp(0.0, 1.0, 0.0)
    , fRectNormal(0.0, 0.0, 1.0)
    , fRectScaleX(1.0)
    , fRectScaleY(1.0)
    // circle
    , fCircleNormal(0.0, 0.0, 1.0)
    // arc
    , fArcStart(1.0, 0.0, 0.0)
    , fArcEnd(0.0, 1.0, 0.0)
    , fArcNormal(0.0, 0.0, 1.0)
    // icon
    , fIconScale(1.0f)
    // Cone
    , fConeDirection(0.0, 0.0, 1.0)
    , fConeHeight(1.0)
    // Box
    , fBoxUp(0.0, 0.0, 1.0)
    , fBoxRight(0.0, 1.0, 0.0)
    , fBoxScale(1.0, 1.0, 1.0)
{
    // quad
    fQuadVertex[0] = MPoint(0.0, 0.0, 0.0);
    fQuadVertex[1] = MPoint(1.0, 0.0, 0.0);
    fQuadVertex[2] = MPoint(1.0, 1.0, 0.0);
    fQuadVertex[3] = MPoint(0.0, 1.0, 0.0);
}

class uiDrawManagerDrawOverride : public MPxDrawOverride
{
public:
    static MPxDrawOverride* Creator(const MObject& obj)
    {
        return new uiDrawManagerDrawOverride(obj);
    }

    virtual ~uiDrawManagerDrawOverride();

    virtual DrawAPI supportedDrawAPIs() const;

    virtual bool isBounded(
        const MDagPath& objPath,
        const MDagPath& cameraPath) const;

    virtual MBoundingBox boundingBox(
        const MDagPath& objPath,
        const MDagPath& cameraPath) const;

    virtual MUserData* prepareForDraw(
        const MDagPath& objPath,
        const MDagPath& cameraPath,
        const MFrameContext& frameContext,
        MUserData* oldData);

    virtual bool hasUIDrawables() const { return true; }

    virtual void addUIDrawables(
        const MDagPath& objPath,
        MHWRender::MUIDrawManager& drawManager,
        const MHWRender::MFrameContext& frameContext,
        const MUserData* data);

protected:

private:
    uiDrawManagerDrawOverride(const MObject& obj);
};

uiDrawManagerDrawOverride::uiDrawManagerDrawOverride(const MObject& obj)
    : MPxDrawOverride(obj, NULL)
{
}

uiDrawManagerDrawOverride::~uiDrawManagerDrawOverride()
{
}

DrawAPI uiDrawManagerDrawOverride::supportedDrawAPIs() const
{
    // this plugin supports both GL and DX
    return (kOpenGL | kDirectX11 | kOpenGLCoreProfile);
}

bool uiDrawManagerDrawOverride::isBounded(const MDagPath& /*objPath*/,
    const MDagPath& /*cameraPath*/) const
{
    return false;
}

MBoundingBox uiDrawManagerDrawOverride::boundingBox(
    const MDagPath& objPath,
    const MDagPath& cameraPath) const
{
    return MBoundingBox();
}

MUserData* uiDrawManagerDrawOverride::prepareForDraw(
    const MDagPath& objPath,
    const MDagPath& cameraPath,
    const MHWRender::MFrameContext& frameContext,
    MUserData* oldData)
{
    uiDrawManagerData* data = dynamic_cast<uiDrawManagerData*>(oldData);
    if (!data) {
        data = new uiDrawManagerData();
    }

    MStatus status;
    MObject uiDrawManagerNode = objPath.node(&status);
    if (status) {
        // retrieve uiType
        {
            MPlug plug(uiDrawManagerNode, uiDrawManager::aUIType);
            data->fUIType = (uiDrawManager::EuiType)plug.asInt();
        }

        // common attributes
        // retrieve color
        {
            MPlug plug(uiDrawManagerNode, uiDrawManager::aPrimitiveColor);
            MObject o = plug.asMObject();
            MFnNumericData nData(o);
            nData.getData(data->fColor.r, data->fColor.g, data->fColor.b);
        }

        // retrieve transparency
        {
            MPlug plug(uiDrawManagerNode, uiDrawManager::aPrimitiveTransparency);
            data->fColor.a = 1.0f - plug.asFloat();
        }

        // retrieve line width
        {
            MPlug plug(uiDrawManagerNode, uiDrawManager::aLineWidth);
            data->fLineWidth = plug.asFloat();
        }

        // retrieve line style
        {
            MPlug plug(uiDrawManagerNode, uiDrawManager::aLineStyle);
            data->fLineStyle = (MUIDrawManager::LineStyle)plug.asShort();
        }

        // retrieve filled flag
        {
            MPlug plug(uiDrawManagerNode, uiDrawManager::aIsFilled);
            data->fIsFilled = plug.asBool();
        }

        // retrieve shaded flag
        {
            MPlug plug(uiDrawManagerNode, uiDrawManager::aShaded);
            data->fShaded = plug.asBool();
        }

        // retrieve x-ray flag
        {
            MPlug plug(uiDrawManagerNode, uiDrawManager::aXRay);
            data->fXRay = plug.asBool();
        }

        // retrieve radius
        {
            MPlug plug(uiDrawManagerNode, uiDrawManager::aRadius);
            data->fRadius = plug.asDouble();
        }

        // retrieve 2D flag
        {
            MPlug plug(uiDrawManagerNode, uiDrawManager::aDraw2D);
            data->fDraw2D = plug.asBool();
        }

        // retrieve WorldViewportConverter flag
        {
            MPlug plug(uiDrawManagerNode, uiDrawManager::aWorldViewportConverter);
            data->fWorldViewportConverter = plug.asBool();
        }
        // retrieve screen position
        {
            MPlug plug(uiDrawManagerNode, uiDrawManager::aPosition);
            MObject o = plug.asMObject();
            MFnNumericData nData(o);
            nData.getData(data->fPosition.x, data->fPosition.y, data->fPosition.z);
            data->fPosition.w = 1.0f;
        }

        switch (data->fUIType)
        {
        case uiDrawManager::kText:
            // retrieve text
            {
                MPlug plug(uiDrawManagerNode, uiDrawManager::aText);
                data->fText = plug.asString();
            }

            // retrieve text font size
            {
                MPlug plug(uiDrawManagerNode, uiDrawManager::aTextFontSize);
                data->fTextFontSize = std::max(plug.asInt(), 0);
            }

            // retrieve font face index
            {
                MPlug plug(uiDrawManagerNode, uiDrawManager::aFontFaceName);
                data->fFontFaceIndex = (unsigned int)plug.asInt();
            }

            // retrieve text alignment
            {
                MPlug plug(uiDrawManagerNode, uiDrawManager::aTextAlignment);
                data->fTextAlignment = (MUIDrawManager::TextAlignment)plug.asShort();
            }

            // retrieve text incline
            {
                MPlug plug(uiDrawManagerNode, uiDrawManager::eTextIncline);
                data->fTextIncline = plug.asInt();
            }

            // retrieve text weight
            {
                MPlug plug(uiDrawManagerNode, uiDrawManager::aTextWeight);
                data->fTextWeight = plug.asInt();
            }

            // retrieve text stretch
            {
                MPlug plug(uiDrawManagerNode, uiDrawManager::aTextStretch);
                data->fTextStretch = plug.asInt();
            }

            // retrieve text line
            {
                MPlug plug(uiDrawManagerNode, uiDrawManager::aTextLine);
                data->fTextLine = plug.asInt();
            }

            // retrieve text box size
            {
                MPlug plug(uiDrawManagerNode, uiDrawManager::aTextBoxSize);
                MObject o = plug.asMObject();
                MFnNumericData nData(o);
                nData.getData(data->fTextBoxWidth, data->fTextBoxHeight);
            }

            // retrieve text box color
            {
                MPlug plug(uiDrawManagerNode, uiDrawManager::aTextBoxColor);
                MObject o = plug.asMObject();
                MFnNumericData nData(o);
                nData.getData(data->fTextBoxColor.r, data->fTextBoxColor.g, data->fTextBoxColor.b);
            }

            // retrieve text box transparency
            {
                MPlug plug(uiDrawManagerNode, uiDrawManager::aTextBoxTransparency);
                data->fTextBoxColor.a = 1.0f - plug.asFloat();
            }
            break;

            case uiDrawManager::kPoint:
            case uiDrawManager::kPointList:
            // retrieve point size
            {
                MPlug plug(uiDrawManagerNode, uiDrawManager::aPointSize);
                data->fPointSize = plug.asFloat();
            }

            if (data->fUIType == uiDrawManager::kPoint)
            {
                data->fPoints.clear();
                data->fPoints.append( data->fPosition );
            }
            else
            {
                unsigned int divisionCount = 50;
                double ddivisionCount = 100.0 / (double)divisionCount;
                data->fPoints.clear();

                MPoint newPoint;
                for (unsigned int i=0; i<=divisionCount; i++)
                {
                    for (unsigned int j=0; j<=divisionCount; j++)
                    {
                        for (unsigned int k=0; k<=divisionCount; k++)
                        {
                            MPoint delta(double(i)*ddivisionCount, double(j)*ddivisionCount, double(k)*ddivisionCount);
                            newPoint = data->fPosition + delta;
                            data->fPoints.append( newPoint );
                        }
                    }
                }
            }
            break;

        case uiDrawManager::kLine:
        case uiDrawManager::kLineList:
        case uiDrawManager::kLineStrip:
            // retrieve line start point
            {
                MPlug plug(uiDrawManagerNode, uiDrawManager::aLineStartPoint);
                MObject o = plug.asMObject();
                MFnNumericData nData(o);
                nData.getData(data->fLineStartPoint.x, data->fLineStartPoint.y, data->fLineStartPoint.z);
                data->fLineStartPoint.w = 1.0f;
            }

            // retrieve line end point
            {
                MPlug plug(uiDrawManagerNode, uiDrawManager::aLineEndPoint);
                MObject o = plug.asMObject();
                MFnNumericData nData(o);
                nData.getData(data->fLineEndPoint.x, data->fLineEndPoint.y, data->fLineEndPoint.z);
                data->fLineEndPoint.w = 1.0f;
            }

            if (data->fUIType == uiDrawManager::kLine)
            {
                data->fLines.clear();
                data->fLines.append( data->fLineStartPoint );
                data->fLines.append( data->fLineEndPoint );
            }
            else
            {
                unsigned int divisionCount = 50;
                double ddivisionCount = 100.0 / (double)divisionCount;
                data->fLines.clear();

                MPoint newPoint;
                for (unsigned int i=0; i<=divisionCount; i++)
                {
                    for (unsigned int j=0; j<=divisionCount; j++)
                    {
                        for (unsigned int k=0; k<=divisionCount; k++)
                        {
                            MPoint delta(double(i)*ddivisionCount, double(j)*ddivisionCount, double(k)*ddivisionCount);
                            newPoint = data->fLineStartPoint + delta;
                            data->fLines.append( newPoint );
                            newPoint = data->fLineEndPoint + delta;
                            data->fLines.append( newPoint );
                        }
                    }
                }
            }
            break;

        case uiDrawManager::kRect:
            // retrieve rect up vector
            {
                MPlug plug(uiDrawManagerNode, uiDrawManager::aRectUp);
                MObject o = plug.asMObject();
                MFnNumericData nData(o);
                nData.getData(data->fRectUp.x, data->fRectUp.y, data->fRectUp.z);
            }

            // retrieve rect normal vector
            {
                MPlug plug(uiDrawManagerNode, uiDrawManager::aRectNormal);
                MObject o = plug.asMObject();
                MFnNumericData nData(o);
                nData.getData(data->fRectNormal.x, data->fRectNormal.y, data->fRectNormal.z);
            }

            // retrieve rect scale
            {
                MPlug plug(uiDrawManagerNode, uiDrawManager::aRectScale);
                MObject o = plug.asMObject();
                MFnNumericData nData(o);
                nData.getData(data->fRectScaleX, data->fRectScaleY);
            }

            break;

        case uiDrawManager::kQuad:
            // retrieve quad vertices
            {
                for (int i = 0; i < 4; ++i)
                {
                    MPlug plug(uiDrawManagerNode, uiDrawManager::aQuadVertex[i]);
                    MObject o = plug.asMObject();
                    MFnNumericData nData(o);
                    nData.getData(data->fQuadVertex[i].x, data->fQuadVertex[i].y, data->fQuadVertex[i].z);
                }
            }

            break;

        case uiDrawManager::kCircle:
            // retrieve circle normal
            {
                MPlug plug(uiDrawManagerNode, uiDrawManager::aCircleNormal);
                MObject o = plug.asMObject();
                MFnNumericData nData(o);
                nData.getData(data->fCircleNormal.x, data->fCircleNormal.y, data->fCircleNormal.z);
            }

            break;

        case uiDrawManager::kArc:
            // retrieve arc start vector
            {
                MPlug plug(uiDrawManagerNode, uiDrawManager::aArcStart);
                MObject o = plug.asMObject();
                MFnNumericData nData(o);
                nData.getData(data->fArcStart.x, data->fArcStart.y, data->fArcStart.z);
            }

            // retrieve arc end vector
            {
                MPlug plug(uiDrawManagerNode, uiDrawManager::aArcEnd);
                MObject o = plug.asMObject();
                MFnNumericData nData(o);
                nData.getData(data->fArcEnd.x, data->fArcEnd.y, data->fArcEnd.z);
            }

            // retrieve arc normal
            {
                MPlug plug(uiDrawManagerNode, uiDrawManager::aArcNormal);
                MObject o = plug.asMObject();
                MFnNumericData nData(o);
                nData.getData(data->fArcNormal.x, data->fArcNormal.y, data->fArcNormal.z);
            }

            break;

        case uiDrawManager::kSphere:
            break;

        case uiDrawManager::kIcon:
            {
                MPlug plug(uiDrawManagerNode, uiDrawManager::aIconName);
                data->fIconIndex = (unsigned int)plug.asInt();
            }
            // Get the name and scale
            {
                MPlug plug(uiDrawManagerNode, uiDrawManager::aIconScale);
                data->fIconScale = std::max(plug.asFloat(), 1.0f);
            }
            break;

        case uiDrawManager::kCone:
            // retrieve cone direction vector
            {
                MPlug plug(uiDrawManagerNode, uiDrawManager::aConeDirection);
                MObject o = plug.asMObject();
                MFnNumericData nData(o);
                nData.getData(data->fConeDirection.x, data->fConeDirection.y, data->fConeDirection.z);
            }
            // retrieve cone height
            {
                MPlug plug(uiDrawManagerNode, uiDrawManager::aConeHeight);
                data->fConeHeight = std::max(plug.asFloat(), 0.0f);
            }
            break;

        case uiDrawManager::kBox:
            // retrieve box up vector
            {
                MPlug plug(uiDrawManagerNode, uiDrawManager::aBoxUp);
                MObject o = plug.asMObject();
                MFnNumericData nData(o);
                nData.getData(data->fBoxUp.x, data->fBoxUp.y, data->fBoxUp.z);
            }
            // retrieve box right vector
            {
                MPlug plug(uiDrawManagerNode, uiDrawManager::aBoxRight);
                MObject o = plug.asMObject();
                MFnNumericData nData(o);
                nData.getData(data->fBoxRight.x, data->fBoxRight.y, data->fBoxRight.z);
            }
            // retrieve box scale
            {
                MPlug plug(uiDrawManagerNode, uiDrawManager::aBoxScale);
                MObject o = plug.asMObject();
                MFnNumericData nData(o);
                nData.getData(data->fBoxScale.x, data->fBoxScale.y, data->fBoxScale.z);
            }
            break;

        default:
            perror("unhandled ui type.");
            break;
        }
    }

    return data;
}

void uiDrawManagerDrawOverride::addUIDrawables(
    const MDagPath& objPath,
    MHWRender::MUIDrawManager& drawManager,
    const MHWRender::MFrameContext& frameContext,
    const MUserData* data)
{
    const uiDrawManagerData* thisdata = dynamic_cast<const uiDrawManagerData*>(data);
    if (!thisdata) {
        return;
    }

    switch (thisdata->fUIType)
    {
    case uiDrawManager::kText:
        {
            // Draw a text "uiDrawManager"
            // All drawing operations must take place between calls to beginDrawable()
            // and endDrawable().
            drawManager.beginDrawable();

            drawManager.setColor(thisdata->fColor);
            drawManager.setFontSize(thisdata->fTextFontSize);
            drawManager.setFontIncline(thisdata->fTextIncline);
            drawManager.setFontWeight(thisdata->fTextWeight);
            drawManager.setFontStretch(thisdata->fTextStretch);
            drawManager.setFontLine(thisdata->fTextLine);

            MString faceName = uiDrawManagerData::fFontList[thisdata->fFontFaceIndex];
            drawManager.setFontName(faceName);
            int boxSize[] = { thisdata->fTextBoxWidth, thisdata->fTextBoxHeight };

            // if fWorldViewportConverter flag is set
            // draw 2D text using text() position is converted from world space.
            // draw 3D text using text2d(), position is converted from view port.
            if (thisdata->fWorldViewportConverter)
            {
                if (thisdata->fDraw2D)
                {
                    double x = thisdata->fPosition.x, y = thisdata->fPosition.y;
                    double viewX, viewY;
                    MPoint worldPos, worldFarPt;
                    char buff[128];

                    // viewportToWorld() convert a point in viewport to points in near and far cliping plane.
                    frameContext.viewportToWorld(x, y, worldPos, worldFarPt);

                    // use near point to draw the text, to ensure the point in frustum
                    // move it a little towards far point direction.
                    worldPos = (worldFarPt - worldPos) * 0.01 + worldPos;
                    sprintf(buff, "(%.2lf %.2lf)->(%.2lf, %.2lf, %.2lf)", x, y,
                        worldPos.x, worldPos.y, worldPos.z);
                    drawManager.text(worldPos, buff, thisdata->fTextAlignment,
                        boxSize[0]+boxSize[1] == 0 ? NULL : boxSize, &thisdata->fTextBoxColor, false);
                    frameContext.worldToViewport(worldPos, viewX, viewY);
                    printf("2D: (%.2lf %.2lf)->(%.2lf, %.2lf, %.2lf)->(%.2lf, %.2lf)\n", x, y,
                        worldPos.x, worldPos.y, worldPos.z, viewX, viewY);
                }
                else
                {
                    double x, y;
                    char buff[128];
                    MPoint worldPt, worldFarPt;
                    frameContext.worldToViewport(thisdata->fPosition, x, y);
                    sprintf(buff, "(%.2lf, %.2lf, %.2lf)->(%.2lf %.2lf)", thisdata->fPosition.x,
                        thisdata->fPosition.y, thisdata->fPosition.z, x, y);
                    drawManager.text2d(MPoint(x, y), buff, thisdata->fTextAlignment,
                        boxSize[0]+boxSize[1] == 0 ? NULL : boxSize, &thisdata->fTextBoxColor, false);
                    frameContext.viewportToWorld(x, y, worldPt, worldFarPt);
                    printf("3D: (%.2lf, %.2lf, %.2lf)->(%.2lf %.2lf)->(%.2lf, %.2lf, %.2lf)\n", thisdata->fPosition.x,
                        thisdata->fPosition.y, thisdata->fPosition.z, x, y, worldPt.x, worldPt.y, worldPt.z);
                }
            }
            else
            {
                if (thisdata->fDraw2D)
                {
                    // uiDrawManagerData::fPosition gives a screen space position
                    // where 2D UI item is located.
                    drawManager.text2d(thisdata->fPosition, thisdata->fText, thisdata->fTextAlignment,
                        boxSize[0]+boxSize[1] == 0 ? NULL : boxSize, &thisdata->fTextBoxColor, false);
                }
                else
                {
                    // for 3D items, place it at the origin of the world space.
                    drawManager.text(thisdata->fPosition, thisdata->fText, thisdata->fTextAlignment,
                        boxSize[0]+boxSize[1] == 0 ? NULL : boxSize, &thisdata->fTextBoxColor, false);
                }
            }
            drawManager.endDrawable();
        }
        break;

    case uiDrawManager::kLine:
    case uiDrawManager::kLineList:
    case uiDrawManager::kLineStrip:
        {
            drawManager.beginDrawable();

            drawManager.setColor(thisdata->fColor);
            drawManager.setLineWidth(thisdata->fLineWidth);
            drawManager.setLineStyle(thisdata->fLineStyle);
            if (thisdata->fUIType == uiDrawManager::kLineStrip)
                drawManager.lineStrip(thisdata->fLines, thisdata->fDraw2D);
            else
                drawManager.lineList(thisdata->fLines, thisdata->fDraw2D);
            drawManager.endDrawable();
        }
        break;

    case uiDrawManager::kPoint:
    case uiDrawManager::kPointList:
        {
            drawManager.beginDrawable();

            drawManager.setColor(thisdata->fColor);
            drawManager.setPointSize(thisdata->fPointSize);
            drawManager.points(thisdata->fPoints, thisdata->fDraw2D);
            drawManager.endDrawable();
        }
        break;

    case uiDrawManager::kRect:
        {
            drawManager.beginDrawable();

            drawManager.setColor(thisdata->fColor);
            drawManager.setLineWidth(thisdata->fLineWidth);
            drawManager.setLineStyle(thisdata->fLineStyle);
            drawManager.setPaintStyle(thisdata->fShaded ?
                MUIDrawManager::kShaded : MUIDrawManager::kFlat);
            if (thisdata->fXRay)
                drawManager.beginDrawInXray();
            if (thisdata->fDraw2D) {
                // For 2d rectangle, an up vector in screen space is used to determine its X
                // and Y directions. In addition, "fRectScaleX" and "fRectScaleY"(in pixels)
                // specify the half-lengths of the 2d rectangle.
                drawManager.rect2d(thisdata->fPosition, thisdata->fRectUp,
                    thisdata->fRectScaleX, thisdata->fRectScaleY, thisdata->fIsFilled);
            }
            else {
                // For 3d rectangle, the up vector should not be parallel with the normal vector.
                drawManager.rect(thisdata->fPosition, thisdata->fRectUp, thisdata->fRectNormal,
                    thisdata->fRectScaleX, thisdata->fRectScaleY, thisdata->fIsFilled);
            }
            if (thisdata->fXRay)
                drawManager.endDrawInXray();
            drawManager.endDrawable();
        }
        break;

    case uiDrawManager::kQuad:
        {
            drawManager.beginDrawable();

            drawManager.setColor(thisdata->fColor);
            drawManager.setLineWidth(thisdata->fLineWidth);
            drawManager.setLineStyle(thisdata->fLineStyle);

            // prepare primitive type
            MUIDrawManager::Primitive mode =
                thisdata->fIsFilled ? MUIDrawManager::kTriStrip : MUIDrawManager::kClosedLine;
            // prepare position list
            MPointArray position;
            for (int i = 0; i < 4; ++i) {
                position.append(thisdata->fQuadVertex[i]);
            }
            // prepare index
            MUintArray index;
            index.append(0);
            index.append(1);
            index.append(3);
            index.append(2);

            // draw mesh
            drawManager.setPaintStyle(thisdata->fShaded ?
                MUIDrawManager::kShaded : MUIDrawManager::kFlat);
            if (thisdata->fXRay)
                drawManager.beginDrawInXray();
            if (thisdata->fDraw2D) {
                drawManager.mesh2d(mode, position, NULL, thisdata->fIsFilled ? &index : NULL);
            }
            else {
                drawManager.mesh(mode, position, NULL, NULL, thisdata->fIsFilled ? &index : NULL);
            }
            if (thisdata->fXRay)
                drawManager.endDrawInXray();
            drawManager.endDrawable();
        }
        break;

    case uiDrawManager::kSphere:
        {
            drawManager.beginDrawable();

            drawManager.setColor(thisdata->fColor);
            drawManager.setLineWidth(thisdata->fLineWidth);
            drawManager.setLineStyle(thisdata->fLineStyle);
            drawManager.setPaintStyle(thisdata->fShaded ?
                MUIDrawManager::kShaded : MUIDrawManager::kFlat);
            if (thisdata->fXRay)
                drawManager.beginDrawInXray();
            drawManager.sphere(thisdata->fPosition, thisdata->fRadius, thisdata->fIsFilled);
            if (thisdata->fXRay)
                drawManager.endDrawInXray();
            drawManager.endDrawable();
        }
        break;

    case uiDrawManager::kCircle:
        {
            drawManager.beginDrawable();

            drawManager.setColor(thisdata->fColor);
            drawManager.setLineWidth(thisdata->fLineWidth);
            drawManager.setLineStyle(thisdata->fLineStyle);
            drawManager.setPaintStyle(thisdata->fShaded ?
                MUIDrawManager::kShaded : MUIDrawManager::kFlat);
            if (thisdata->fXRay)
                drawManager.beginDrawInXray();
            if (thisdata->fDraw2D) {
                // The radius in specified as pixel unit for 2d items.
                drawManager.circle2d(thisdata->fPosition, thisdata->fRadius,
                    thisdata->fIsFilled);
            }
            else {
                drawManager.circle(thisdata->fPosition, thisdata->fCircleNormal, thisdata->fRadius,
                    thisdata->fIsFilled);
            }
            if (thisdata->fXRay)
                drawManager.endDrawInXray();

            drawManager.endDrawable();
        }
        break;

    case uiDrawManager::kArc:
        {
            drawManager.beginDrawable();

            drawManager.setColor(thisdata->fColor);
            drawManager.setLineWidth(thisdata->fLineWidth);
            drawManager.setLineStyle(thisdata->fLineStyle);
            drawManager.setPaintStyle(thisdata->fShaded ?
                MUIDrawManager::kShaded : MUIDrawManager::kFlat);
            if (thisdata->fXRay)
                drawManager.beginDrawInXray();
            if (thisdata->fDraw2D) {
                // If 2d, the range of the arc is defined by the start and end vectors
                // specified in screen space.
                drawManager.arc2d(thisdata->fPosition, thisdata->fArcStart, thisdata->fArcEnd,
                    thisdata->fRadius, thisdata->fIsFilled);
            }
            else {
                // For 3d arc, the projections of the start and end vectors onto the arc plane(
                // determined by the normal vector) determine the range of the arc.
                drawManager.arc(thisdata->fPosition, thisdata->fArcStart, thisdata->fArcEnd,
                    thisdata->fArcNormal, thisdata->fRadius, thisdata->fIsFilled);
            }
            if (thisdata->fXRay)
                drawManager.endDrawInXray();

            drawManager.endDrawable();
        }
        break;

    case uiDrawManager::kIcon:
        {
            MString iconName = uiDrawManagerData::fIconList[thisdata->fIconIndex];
            drawManager.beginDrawable();
            drawManager.setColor(thisdata->fColor);
            if (thisdata->fXRay)
                drawManager.beginDrawInXray();
            drawManager.icon(thisdata->fPosition, iconName, thisdata->fIconScale);
            if (thisdata->fXRay)
                drawManager.endDrawInXray();
            drawManager.endDrawable();
        }
        break;

    case uiDrawManager::kCone:
        {
            drawManager.beginDrawable();

            drawManager.setColor(thisdata->fColor);
            drawManager.setLineWidth(thisdata->fLineWidth);
            drawManager.setLineStyle(thisdata->fLineStyle);
            drawManager.setPaintStyle(thisdata->fShaded ?
                MUIDrawManager::kShaded : MUIDrawManager::kFlat);
            if (thisdata->fXRay)
                drawManager.beginDrawInXray();
            drawManager.cone(thisdata->fPosition,
                            thisdata->fConeDirection,
                            thisdata->fRadius,
                            thisdata->fConeHeight,
                            thisdata->fIsFilled);
            if (thisdata->fXRay)
                drawManager.endDrawInXray();

            drawManager.endDrawable();
        }
        break;

    case uiDrawManager::kBox:
        {
            drawManager.beginDrawable();

            drawManager.setColor(thisdata->fColor);
            drawManager.setLineWidth(thisdata->fLineWidth);
            drawManager.setLineStyle(thisdata->fLineStyle);
            drawManager.setPaintStyle(thisdata->fShaded ?
                MUIDrawManager::kShaded : MUIDrawManager::kFlat);
            if (thisdata->fXRay)
                drawManager.beginDrawInXray();
            drawManager.box(thisdata->fPosition,
                            thisdata->fBoxUp,
                            thisdata->fBoxRight,
                            thisdata->fBoxScale[0],
                            thisdata->fBoxScale[1],
                            thisdata->fBoxScale[2],
                            thisdata->fIsFilled);
            if (thisdata->fXRay)
                drawManager.endDrawInXray();

            drawManager.endDrawable();
        }
        break;

    default:
        perror("unhandled ui types.");
        break;
    }

}

//---------------------------------------------------------------------------
//---------------------------------------------------------------------------
// Plugin Registration
//---------------------------------------------------------------------------
//---------------------------------------------------------------------------

MStatus uiDrawManager::initialize()
{
    MStatus status;

    MFnNumericAttribute nAttr;
    MFnEnumAttribute eAttr;
    MFnTypedAttribute typedAttr;

    // Add ui type attribute
    aUIType = eAttr.create("uiType", "ut", uiDrawManager::kText);
    eAttr.addField("text", uiDrawManager::kText);
    eAttr.addField("line", uiDrawManager::kLine);
    eAttr.addField("point", uiDrawManager::kPoint);
    eAttr.addField("rect", uiDrawManager::kRect);
    eAttr.addField("quad", uiDrawManager::kQuad);
    eAttr.addField("sphere", uiDrawManager::kSphere);
    eAttr.addField("circle", uiDrawManager::kCircle);
    eAttr.addField("arc", uiDrawManager::kArc);
    eAttr.addField("line list", uiDrawManager::kLineList);
    eAttr.addField("line strip", uiDrawManager::kLineStrip);
    eAttr.addField("point list", uiDrawManager::kPointList);
    eAttr.addField("icon", uiDrawManager::kIcon);
    eAttr.addField("cone", uiDrawManager::kCone);
    eAttr.addField("box", uiDrawManager::kBox);
    MPxNode::addAttribute(aUIType);

    // Add color attribute
    aPrimitiveColor = nAttr.create("primitiveColor", "pc", MFnNumericData::k3Float);
    nAttr.setDefault(1.0f, 0.0f, 0.0f);
    nAttr.setUsedAsColor(true);
    MPxNode::addAttribute(aPrimitiveColor);

    // Add transparency attribute
    aPrimitiveTransparency = nAttr.create("primitiveTransparency", "pt", MFnNumericData::kFloat, 0.0);
    nAttr.setSoftMin(0.0);
    nAttr.setSoftMax(1.0);
    MPxNode::addAttribute(aPrimitiveTransparency);

    // add line width and line style attributes
    aLineWidth = nAttr.create("lineWidth", "lw", MFnNumericData::kFloat, 2.0);
    MPxNode::addAttribute(aLineWidth);

    aLineStyle = eAttr.create("lineStyle", "ls", MUIDrawManager::kSolid);
    eAttr.addField("solid", MUIDrawManager::kSolid);
    eAttr.addField("shortdotted", MUIDrawManager::kShortDotted);
    eAttr.addField("shortdashed", MUIDrawManager::kShortDashed);
    eAttr.addField("dashed", MUIDrawManager::kDashed);
    eAttr.addField("dotted", MUIDrawManager::kDotted);
    MPxNode::addAttribute(aLineStyle);

    // Add filled attribute
    aIsFilled = nAttr.create("isFilled", "if", MFnNumericData::kBoolean, 0);
    MPxNode::addAttribute(aIsFilled);

    // Add shaded attribute
    aShaded = nAttr.create("shaded", "sd", MFnNumericData::kBoolean, 0);
    MPxNode::addAttribute(aShaded);

    // Add xray attribute
    aXRay = nAttr.create("xray", "xr", MFnNumericData::kBoolean, 0);
    MPxNode::addAttribute(aXRay);

    // Add radius attribute
    aRadius = nAttr.create("radius", "ra", MFnNumericData::kDouble, 1.0);
    MPxNode::addAttribute(aRadius);

    // add 2D attributes
    aDraw2D = nAttr.create("draw2D", "d2", MFnNumericData::kBoolean, 0);
    MPxNode::addAttribute(aDraw2D);

    // add  WorldViewportConverter attribute
    aWorldViewportConverter = nAttr.create("useWorldViewportConverter", "wvc", MFnNumericData::kBoolean, 0);
    MPxNode::addAttribute(aWorldViewportConverter);

    aPosition = nAttr.create("position", "pos", MFnNumericData::k3Double);
    nAttr.setDefault(0.0, 0.0, 0.001);
    MPxNode::addAttribute(aPosition);

    // Add text attributes.
    MFnStringData stringFn;
    MObject defaultText = stringFn.create("uiDrawManager-Text");
    aText = typedAttr.create("text", "t", MFnData::kString, defaultText);
    MPxNode::addAttribute(aText);

    aTextFontSize = nAttr.create("textFontSize", "tfs", MFnNumericData::kInt, MUIDrawManager::kDefaultFontSize);
    nAttr.setMin(-1);
    nAttr.setMax(99);
    MPxNode::addAttribute(aTextFontSize);

    unsigned int nFont = MUIDrawManager::getFontList(uiDrawManagerData::fFontList);
    if (nFont == 0)
    {
        perror("No font available!");
    }
    aFontFaceName = eAttr.create("fontFaceName", "ffn", 0);
    for (unsigned int i = 0; i < nFont; i++)
    {
        MString str = uiDrawManagerData::fFontList[i];
        eAttr.addField(str, (short)i);
    }
    MPxNode::addAttribute(aFontFaceName);

    aTextAlignment = eAttr.create("textAlignment", "ta", MUIDrawManager::kLeft);
    eAttr.addField("left", MUIDrawManager::kLeft);
    eAttr.addField("center", MUIDrawManager::kCenter);
    eAttr.addField("right", MUIDrawManager::kRight);
    MPxNode::addAttribute(aTextAlignment);

    eTextIncline = eAttr.create("textIncline", "tic", MUIDrawManager::kInclineNormal);
    eAttr.addField("normal", MUIDrawManager::kInclineNormal);
    eAttr.addField("italic", MUIDrawManager::kInclineItalic);
    MPxNode::addAttribute(eTextIncline);

    aTextWeight = eAttr.create("textWeight", "tw", MUIDrawManager::kWeightBold);
    eAttr.addField("light", MUIDrawManager::kWeightLight);
    eAttr.addField("normal", MUIDrawManager::kWeightNormal);
    eAttr.addField("demiBold", MUIDrawManager::kWeightDemiBold);
    eAttr.addField("bold", MUIDrawManager::kWeightBold);
    eAttr.addField("black", MUIDrawManager::kWeightBlack);
    MPxNode::addAttribute(aTextWeight);

    aTextStretch = nAttr.create("textStretch", "ts", MFnNumericData::kInt, MUIDrawManager::kStretchUnstretched);
    nAttr.setMin(50);
    nAttr.setMax(200);
    MPxNode::addAttribute(aTextStretch);

    aTextLine = eAttr.create("textLine", "tl", 0);
    eAttr.addField("none", 0);
    eAttr.addField("overline", MUIDrawManager::kLineOverline);
    eAttr.addField("underline", MUIDrawManager::kLineUnderline);
    eAttr.addField("strikeout", MUIDrawManager::kLineStrikeoutLine);
    MPxNode::addAttribute(aTextLine);

    aTextBoxSize = nAttr.create("textBoxSize", "tbs", MFnNumericData::k2Int);
    nAttr.setDefault(0, 0);
    MPxNode::addAttribute(aTextBoxSize);

    aTextBoxColor = nAttr.create("textBoxColor", "tbc", MFnNumericData::k3Float);
    nAttr.setDefault(0.0f, 1.0f, 1.0f);
    nAttr.setUsedAsColor(true);
    MPxNode::addAttribute(aTextBoxColor);

    aTextBoxTransparency = nAttr.create("textBoxTransparency", "tbt", MFnNumericData::kFloat, 0.0);
    nAttr.setSoftMin(0.0);
    nAttr.setSoftMax(1.0);
    MPxNode::addAttribute(aTextBoxTransparency);

    // add point attributes
    aPointSize = nAttr.create("pointSize", "ps", MFnNumericData::kFloat, 2.0);
    MPxNode::addAttribute(aPointSize);

    // add line attributes
    aLineStartPoint = nAttr.create("lineStartPoint", "lsp", MFnNumericData::k3Double);
    nAttr.setDefault(0.0, 0.0, 0.0);
    MPxNode::addAttribute(aLineStartPoint);

    aLineEndPoint = nAttr.create("lineEndPoint", "lep", MFnNumericData::k3Double);
    nAttr.setDefault(1.0, 1.0, 1.0);
    MPxNode::addAttribute(aLineEndPoint);

    // add rect attributes
    aRectUp = nAttr.create("rectUp", "ru", MFnNumericData::k3Double);
    nAttr.setDefault(0.0, 1.0, 0.0);
    MPxNode::addAttribute(aRectUp);

    aRectNormal = nAttr.create("rectNormal", "rn", MFnNumericData::k3Double);
    nAttr.setDefault(0.0, 0.0, 1.0);
    MPxNode::addAttribute(aRectNormal);

    aRectScale = nAttr.create("rectScale", "rs", MFnNumericData::k2Double);
    nAttr.setDefault(1.0, 1.0);
    MPxNode::addAttribute(aRectScale);

    // add quad attributes
    double defaultPosition[4][3] =
    {
        {0.0, 0.0, 0.0},
        {1.0, 0.0, 0.0},
        {1.0, 1.0, 0.0},
        {0.0, 1.0, 0.0}
    };
    for (int i = 0; i < 4;  ++i)
    {
        MString fullName = "quadVertex";
        MString shortName = "qv";
        aQuadVertex[i] = nAttr.create(fullName + i, shortName + i, MFnNumericData::k3Double);
        nAttr.setDefault(defaultPosition[i][0], defaultPosition[i][1], defaultPosition[i][2]);
        MPxNode::addAttribute(aQuadVertex[i]);
    }

    // add circle attributes
    aCircleNormal = nAttr.create("circleNormal", "cn", MFnNumericData::k3Double);
    nAttr.setDefault(0.0, 0.0, 1.0);
    MPxNode::addAttribute(aCircleNormal);

    // add arc attributes
    aArcStart = nAttr.create("arcStartVector", "asv", MFnNumericData::k3Double);
    nAttr.setDefault(1.0, 0.0, 0.0);
    MPxNode::addAttribute(aArcStart);

    aArcEnd = nAttr.create("arcEndVector", "aev", MFnNumericData::k3Double);
    nAttr.setDefault(0.0, 1.0, 0.0);
    MPxNode::addAttribute(aArcEnd);

    aArcNormal = nAttr.create("arcNormal", "an", MFnNumericData::k3Double);
    nAttr.setDefault(0.0, 0.0, 1.0);
    MPxNode::addAttribute(aArcNormal);

    // icon attributes
    aIconName = eAttr.create("icon", "i", 0 );
    unsigned int iconCount = MUIDrawManager::getIconNames(uiDrawManagerData::fIconList);
    for (unsigned int i=0; i<iconCount; i++)
    {
        MString str = uiDrawManagerData::fIconList[i];
        eAttr.addField(str, (short)i);
    }
    MPxNode::addAttribute(aIconName);

    aIconScale = nAttr.create("iconScale", "cs", MFnNumericData::kFloat, 1.0);
    MPxNode::addAttribute(aIconScale);

    // cone attributes
    aConeDirection = nAttr.create("coneDirection", "cd", MFnNumericData::k3Double);
    nAttr.setDefault(0.0, 0.0, 1.0);
    MPxNode::addAttribute(aConeDirection);

    aConeHeight = nAttr.create("coneHeight", "ch", MFnNumericData::kDouble);
    nAttr.setDefault(1.0);
    MPxNode::addAttribute(aConeHeight);

    // box attributes
    aBoxUp = nAttr.create("boxUp", "bu", MFnNumericData::k3Double);
    nAttr.setDefault(0.0, 0.0, 1.0);
    MPxNode::addAttribute(aBoxUp);

    aBoxRight = nAttr.create("boxRight", "br", MFnNumericData::k3Double);
    nAttr.setDefault(0.0, 1.0, 0.0);
    MPxNode::addAttribute(aBoxRight);

    aBoxScale = nAttr.create("boxScale", "bs", MFnNumericData::k3Double);
    nAttr.setDefault(1.0, 1.0, 1.0);
    MPxNode::addAttribute(aBoxScale);

    return MS::kSuccess;
}

MStatus initializePlugin( MObject obj )
{
    MStatus   status;
    MFnPlugin plugin( obj, PLUGIN_COMPANY, "3.0", "Any");

    status = plugin.registerNode(
        "uiDrawManager",
        uiDrawManager::id,
        &uiDrawManager::creator,
        &uiDrawManager::initialize,
        MPxNode::kLocatorNode,
        &uiDrawManager::drawDbClassification);
    if (!status) {
        status.perror("registerNode");
        return status;
    }

    status = MHWRender::MDrawRegistry::registerDrawOverrideCreator(
        uiDrawManager::drawDbClassification,
        uiDrawManager::drawRegistrantId,
        uiDrawManagerDrawOverride::Creator);
    if (!status) {
        status.perror("registerDrawOverrideCreator");
        return status;
    }

    return status;
}

MStatus uninitializePlugin( MObject obj)
{
    MStatus   status;
    MFnPlugin plugin( obj );

    status = MDrawRegistry::deregisterGeometryOverrideCreator(
        uiDrawManager::drawDbClassification,
        uiDrawManager::drawRegistrantId);
    if (!status) {
        status.perror("deregisterGeometryOverrideCreator");
        return status;
    }

    status = plugin.deregisterNode( uiDrawManager::id );
    if (!status) {
        status.perror("deregisterNode");
        return status;
    }

    return status;
}