meshReorder/meshReorderCmd.cpp

//-
// ==========================================================================
// Copyright 1995,2006,2008 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.
// ==========================================================================
//+

#include "meshMapUtils.h"
#include "meshReorderCmd.h"

#include <maya/MArgList.h>
#include <maya/MDagPathArray.h>
#include <maya/MFnMesh.h>
#include <maya/MFnMeshData.h>
#include <maya/MFnNumericData.h>
#include <maya/MIOStream.h>
#include <maya/MItSelectionList.h>
#include <maya/MItMeshVertex.h>
#include <maya/MPlug.h>
#include <maya/MString.h>


//
// DESCRIPTION:    
// The meshReorder plug-in produces a meshReorder command that re-indexes a polygon 
// mesh based on a used defined starting face, and creates a new mesh that has this new ordering. 
//
// Run the following commands to create a polygon plane and modify the order of the vertices of the first face.
// polyPlane;
// delete -ch;
// ToggleVertIDs;
// meshReorder pPlane1.vtx[12] pPlane1.vtx[1] pPlane1.vtx[0]
// 
// The plane turns black after the order of its vertices is reversed, since you have reversed the winding order
// of the plane.
//
// See Also:
//      meshReorderTool.cpp : This context allows you to interactively pick vertices and invoke this command.
//      meshRemapCmd.cpp: This command allows you to remap vertex/edge/face information 
//      from one mesh onto another.
//     



// CONSTRUCTOR DEFINITION:
meshReorderCommand::meshReorderCommand()
{
    fClampedArray = NULL;
    fRepArray = NULL;
    fColorArrays = NULL;
    fVertexColorArrays = NULL;
    fColorIdsArrays = NULL;
    fUArrays = NULL;
    fVArrays = NULL;
    fUVIdsArrays = NULL;
}


// DESTRUCTOR DEFINITION:
meshReorderCommand::~meshReorderCommand()
{
    resetColorsUVsMemory();
}


// METHOD FOR CREATING AN INSTANCE OF THIS COMMAND:
void* meshReorderCommand::creator()
{
    return new meshReorderCommand;
}


MStatus meshReorderCommand::parseArgs(const MArgList& args)
{
    MStatus stat;
    MString err;


    if( args.length() != 3 )
    {
        displayError("3 vertices must be specified");
        return MS::kFailure;
    }

    MObjectArray selectedComponent(3);
    MDagPathArray selectedPath;

    selectedPath.setLength(3);

    int argIdx = 0;
    for (unsigned int j = 0; j < 3; j++)
    {
        MString arg;

        if( ( stat = args.get( argIdx, arg )) != MStatus::kSuccess )
        {
            displayError( "Can't parse arg");
            return stat;
        }

        MSelectionList list;
        if (! list.add( arg ) )
        {
            err = arg + ": no such component";
            displayError(err);
            return MS::kFailure; // no such component
        }

        MItSelectionList selectionIt (list, MFn::kComponent);
        if (selectionIt.isDone ())
        {
            err = arg + ": not a component";
            displayError (err);
            return MS::kFailure;
        }

        if( selectionIt.getDagPath (selectedPath[j], selectedComponent[j]) != MStatus::kSuccess )
        {
            displayError( "Can't get path for");
            return stat;
        }


        if (!selectedPath[j].node().hasFn(MFn::kMesh) && !(selectedPath[j].node().hasFn(MFn::kTransform) && selectedPath[j].hasFn(MFn::kMesh)))
        {
            err = arg + ": Invalid type!  Only a mesh or its transform can be specified!";
            displayError (err);
            return MStatus::kFailure;
        }

        argIdx++;
    }

    if( ( stat = meshMapUtils::validateFaceSelection( selectedPath, selectedComponent, &fFaceIdxSrc, &fFaceVtxSrc ) ) != MStatus::kSuccess )
    {
        displayError("Selected vertices don't define a unique face on source mesh");
        return stat;
    }

    fDagPathSrc = selectedPath[0];

    return stat;
}

// FIRST INVOKED WHEN COMMAND IS CALLED, PARSING THE COMMAND ARGUMENTS, INITIALIZING DEFAULT PARAMETERS, THEN CALLING redoIt():
MStatus meshReorderCommand::doIt(const MArgList& args)
{
    MStatus  stat = MStatus::kSuccess;

    if ( ( stat = parseArgs( args ) ) != MStatus::kSuccess )
    {
        displayError ("Error parsing arguments");
        return stat;
    }

    return redoIt();
}

MStatus meshReorderCommand::redoIt()
{
    MStatus  stat = MStatus::kSuccess;

    MIntArray           newPolygonCounts;
    MIntArray           newPolygonConnects;
    MFloatPointArray    origVertices;
    MFloatPointArray    newVertices;

    unsigned i;

    MFnMesh theMesh( fDagPathSrc, &stat );
    if( stat != MStatus::kSuccess )
    {
        displayError(" MFnMesh creation");
        return stat;
    }

    //  The mesh cannot have history or this won't work.
    MPlug   historyPlug = theMesh.findPlug("inMesh", true);

    if (historyPlug.isDestination()) {
        displayError("The mesh has history. Its geometry cannot be modified.");
        return MS::kInvalidParameter;
    }

    stat = theMesh.getPoints (origVertices, MSpace::kObject );
    if( stat != MStatus::kSuccess )
    {
        displayError(" MFnMesh getPoints");
        return stat;
    }

    // Initialize the traversal flags and CV mappings for this shape 
    MIntArray           faceTraversal( theMesh.numPolygons(), false );
    MIntArray cvMapping(theMesh.numVertices(), -1);
    MIntArray cvMappingInverse(theMesh.numVertices(), -1);

    //
    //  Starting with the user selected face, recursively rebuild the entire mesh
    //
    stat = meshMapUtils::traverseFace( fDagPathSrc, fFaceIdxSrc, fFaceVtxSrc[0], fFaceVtxSrc[1], faceTraversal,
                    cvMapping, cvMappingInverse, 
                    newPolygonCounts, newPolygonConnects, 
                    origVertices, newVertices );

    if ( stat != MStatus::kSuccess )
    {
        displayError(" could not process all the mesh faces.");
        return stat;
    }

    // Store mesh vertices and connectivity information for undo. Must collect the information here before it is 
    // modified by createInPlace() call.
    fVertices.copy(origVertices);
    MItMeshPolygon polyIter(fDagPathSrc.node());
    while(!polyIter.isDone()) 
    {
        fPolygonCounts.append(polyIter.polygonVertexCount());
        for(i = 0; i < polyIter.polygonVertexCount(); i++)
        {
            fPolygonConnects.append(polyIter.vertexIndex(i));
        }
        polyIter.next();
    }

    fColorSetNames.clear();
    theMesh.getColorSetNames(fColorSetNames);
    int numColorSets = fColorSetNames.length();
    fColorArrays = new MColorArray[numColorSets];
    fColorIdsArrays = new MIntArray[numColorSets];

    collectColorsUVs(theMesh, false);

    stat = theMesh.createInPlace( newVertices.length(), newPolygonCounts.length(), newVertices, newPolygonCounts, newPolygonConnects );

    if ( stat != MStatus::kSuccess )
    {
        displayError(" MFnMesh::createInPlace failed.");

        fCVMapping.clear();
        fCVMappingInverse.clear();
        fVertices.clear();
        fPolygonCounts.clear();
        fPolygonConnects.clear();
        delete [] fColorArrays;  fColorArrays = NULL;
        delete [] fColorIdsArrays;fColorIdsArrays = NULL;

        // Free memeory allocated in collectColorsUVs()
        resetColorsUVsMemory();

        return stat;
    }

    // Clear out the tweaks/pnts attribute (as they are now baked into the mesh)
    MFnNumericData numDataFn;
    MObject zeroVector = numDataFn.create( MFnNumericData::k3Float );
    numDataFn.setData( 0.0f, 0.0f, 0.0f );

    MFnDependencyNode depFn( fDagPathSrc.node() );
    MPlug tweaks = depFn.findPlug("pnts");
    MIntArray tweakIndices;
    tweaks.getExistingArrayAttributeIndices( tweakIndices );
    unsigned int numTweaks = (unsigned int) tweakIndices.length();
    for( i = 0; i < numTweaks; i++ )
    {
        MPlug tweakElem = tweaks.elementByLogicalIndex( tweakIndices[i] );
        tweakElem.setMObject( zeroVector );
    }

    assignColorsUVs(theMesh, cvMapping, cvMappingInverse, false);

    // Store fCVMapping and fCVMappingInverse for undo
    fCVMapping = cvMapping;
    fCVMappingInverse = cvMappingInverse;

    return stat;
}

MStatus meshReorderCommand::undoIt()
{
    MStatus  stat = MStatus::kSuccess;
    MFnMesh theMesh( fDagPathSrc );

    fColorSetNames.clear();
    theMesh.getColorSetNames(fColorSetNames);

    collectColorsUVs(theMesh, true);

    stat = theMesh.createInPlace( fVertices.length(), fPolygonCounts.length(), fVertices, fPolygonCounts, fPolygonConnects );

    assignColorsUVs(theMesh, fCVMappingInverse, fCVMapping, true);

    fCVMapping.clear();
    fCVMappingInverse.clear();
    fVertices.clear();
    fPolygonCounts.clear();
    fPolygonConnects.clear();
    delete [] fColorArrays;  fColorArrays = NULL;
    delete [] fColorIdsArrays;fColorIdsArrays = NULL;

    return stat;
}

void meshReorderCommand::collectColorsUVs(MFnMesh &theMesh, bool isUndo)
{
    int i;
    // Store Colors
    int numColorSets = fColorSetNames.length();
    fClampedArray = new bool[numColorSets];
    fRepArray = new MFnMesh::MColorRepresentation[numColorSets];
    fVertexColorArrays = new MColorArray[numColorSets];

    for (i = 0; i < numColorSets; i++)
    {
        fClampedArray[i] = theMesh.isColorClamped(fColorSetNames[i]);
        fRepArray[i] = theMesh.getColorRepresentation(fColorSetNames[i]);
        // We need to use two different approaches to set colors because unfortunately 
        // setVertexColors() doesn't work in the case of undo and setColors() will
        // require a huge effort to construct the colorIds in the non undo case.
        theMesh.getVertexColors(fVertexColorArrays[i], &(fColorSetNames[i]));

        if(!isUndo) {
            theMesh.getColors(fColorArrays[i], &(fColorSetNames[i]));
            unsigned nth = 0;
            fColorIdsArrays[i].setLength(theMesh.numColors(fColorSetNames[i]));
            MItMeshPolygon polyIter(fDagPathSrc.node());
            while(!polyIter.isDone()) 
            {
                for(unsigned j = 0; j < polyIter.polygonVertexCount(); j++)
                {
                    unsigned polygonIdx = polyIter.index();
                    int colorId;
                    theMesh.getColorIndex(polygonIdx, j, colorId, &(fColorSetNames[i]));
                    fColorIdsArrays[i][nth] = colorId;
                    nth++;
                }
                polyIter.next();
            }
        }
        theMesh.deleteColorSet(fColorSetNames[i]);
    }

    // Store UVs 
    fUVSetNames.clear();
    theMesh.getUVSetNames(fUVSetNames);
    int numUVSets = fUVSetNames.length();
    fUArrays = new MFloatArray[numUVSets];
    fVArrays = new MFloatArray[numUVSets];
    fUVIdsArrays = new MIntArray[numUVSets];

    for (i = 0; i < numUVSets; i++) 
    {
        MIntArray uvCounts;
        MIntArray uvIds;
        theMesh.getAssignedUVs(uvCounts, uvIds, &(fUVSetNames[i]));

        unsigned nth = 0;
        fUVIdsArrays[i].setLength(fVertices.length());
        MItMeshPolygon polyIter(fDagPathSrc.node());
        while(!polyIter.isDone()) 
        {
            for(unsigned j = 0; j < polyIter.polygonVertexCount(); j++)
            {
                unsigned vertexIdx = polyIter.vertexIndex(j);
                fUVIdsArrays[i][vertexIdx] = uvIds[nth];
                nth++;
            }
            polyIter.next();
        }

        theMesh.getUVs(fUArrays[i], fVArrays[i], &(fUVSetNames[i]));
        theMesh.deleteUVSet(fUVSetNames[i]);
    }
}

void meshReorderCommand::assignColorsUVs(MFnMesh &theMesh, MIntArray &colorMapping, MIntArray &uvMapping, bool isUndo)
{
    int i;

    // Copy Colors 
    MString defaultColorSetName;
    theMesh.getCurrentColorSetName(defaultColorSetName);
    int numColorSets = fColorSetNames.length();
    for (i = 0; i < numColorSets; i++) 
    {
        // Not to duplicate default color set
        if (fColorSetNames[i] != defaultColorSetName)
        {
            theMesh.createColorSet(fColorSetNames[i], NULL, fClampedArray[i], fRepArray[i]);
        }

        if (fVertexColorArrays[i].length() > 0 && fVertexColorArrays[i].length() == fVertices.length())
        {
            // We need to use two different approaches to set colors because unfortunately 
            // setVertexColors() doesn't work in the case of undo and setColors() will
            // require a huge effort to construct the colorIds in the non undo case.
            if(!isUndo) 
            {
                theMesh.setVertexColors(fVertexColorArrays[i], colorMapping, NULL, fRepArray[i]);
            } else {
                theMesh.setColors(fColorArrays[i], NULL, fRepArray[i]);
                theMesh.assignColors(fColorIdsArrays[i], &(fColorSetNames[i]));
            }
        }
    }

    // Copy UVs
    MString defaultUVSetName;
    theMesh.getCurrentUVSetName(defaultUVSetName);
    int numUVSets = fUVSetNames.length();
    for (i = 0; i < numUVSets; i++) 
    {
        // Not to duplicate default uv set
        if (fUVSetNames[i] != defaultUVSetName)
        {
            theMesh.createUVSet(fUVSetNames[i]);
        }

        if (fUArrays[i].length() > 0 && fUArrays[i].length() == fVArrays[i].length())
        {
            theMesh.setUVs(fUArrays[i], fVArrays[i], &(fUVSetNames[i]));
            MItMeshPolygon polyIter(fDagPathSrc.node());
            while(!polyIter.isDone()) 
            {
                for(unsigned j = 0; j < polyIter.polygonVertexCount(); j++)
                {
                    unsigned polygonIdx = polyIter.index();
                    unsigned vertexIdx = polyIter.vertexIndex(j);
                    int uvId = fUVIdsArrays[i][uvMapping[vertexIdx]];
                    theMesh.assignUV(polygonIdx, j, uvId);
                }
                polyIter.next();
            }
        }
    }

    resetColorsUVsMemory();
}

void meshReorderCommand::resetColorsUVsMemory()
{
    if (fClampedArray != NULL) 
    {
        delete [] fClampedArray; 
        fClampedArray = NULL;
    }
    if (fRepArray != NULL)
    {
        delete [] fRepArray;
        fRepArray = NULL;
    }
    if (fVertexColorArrays != NULL)
    {
        delete [] fVertexColorArrays;
        fVertexColorArrays = NULL;
    }
    if (fUArrays != NULL)
    {
        delete [] fUArrays;
        fUArrays = NULL;
    }
    if (fVArrays != NULL)
    {
        delete [] fVArrays;
        fVArrays = NULL;
    }
    if (fUVIdsArrays != NULL)
    {
        delete [] fUVIdsArrays;
        fUVIdsArrays = NULL;
    }
    fColorSetNames.clear();
    fUVSetNames.clear();
}