#include <maxapi.h>

Class Description

See also: Snap Flags, Class Ray, Class Point3, Class IPoint2, Class Matrix3, Class ModContext, Class HitData, Class GraphicsWindow, Class INode.

Description:: This class provides methods to access properties of the viewport, convert points between viewport and world coordinates, snap points and lengths, etc. Many methods associated with hit testing are also here. All the methods of this class are implemented by the system.

Inheritance diagram for ViewExp:

Public Types
enum	{ kEXECUTE_GET_VIEWEXP_10 = 0, kEXECUTE_GET_VIEWPORT_ID = 1, kEXECUTE_GET_VIEWEXP_11 = 2, kEXECUTE_GET_VIEWEXP_13 = 3 }

Public Member Functions
virtual int	GetViewID ()=0
	Return the unique ID of the viewport represented by the ViewExp. More...

virtual ViewExp *	ToPointer ()=0

virtual bool	IsAlive ()=0

virtual Point2	MapViewToScreen (const Point3 &p)=0

virtual float	GetFPS ()=0
	Get the FPS from the active viewport. More...

virtual void	SetSolidBackgroundColorMode (bool bSolidColor)=0
	Set the viewport background color mode as solid color mode or gradient color mode. More...

virtual bool	IsSolidBackgroundColorMode ()=0
	Get the current viewport background color mode. More...

virtual void	ResetBackgroundColorMode ()=0
	Reset viewport background color mode. More...

virtual void	InvalidateRect (const Rect &rect)=0

virtual INT_PTR	Execute (int cmd, ULONG_PTR arg1=0, ULONG_PTR arg2=0, ULONG_PTR arg3=0)

World Space Conversion
virtual Point3	GetPointOnCP (const IPoint2 &ps)=0

virtual float	GetCPDisp (const Point3 base, const Point3 &dir, const IPoint2 &sp1, const IPoint2 &sp2, BOOL snap=FALSE)=0

virtual Point3	MapScreenToView (IPoint2 &sp, float depth)=0

virtual void	MapScreenToWorldRay (float sx, float sy, Ray &ray)=0

virtual BOOL	SetAffineTM (const Matrix3 &m)=0

virtual void	GetAffineTM (Matrix3 &tm)=0

virtual float	GetScreenScaleFactor (const Point3 worldPoint)=0

virtual float	GetVPWorldWidth (const Point3 wPoint)=0

virtual Point3	MapCPToWorld (const Point3 cpPoint)=0

virtual float	NonScalingObjectSize ()=0

Snapping
virtual Point3	SnapPoint (const IPoint2 &in, IPoint2 &out, Matrix3 *plane2d=NULL, DWORD flags=0)=0

virtual void	SnapPreview (const IPoint2 &in, IPoint2 &out, Matrix3 *plane2d=NULL, DWORD flags=0)=0

virtual void	GetGridDims (float MinX, float MaxX, float MinY, float MaxY)=0

virtual float	SnapLength (float in)=0

Access to Viewport Properties

virtual GraphicsWindow *	getGW ()=0

virtual int	IsWire ()=0

virtual Rect	GetDammageRect ()=0

virtual void	GetConstructionTM (Matrix3 &tm)=0

virtual void	SetGridSize (float size)=0

virtual float	GetGridSize ()=0

virtual BOOL	IsGridVisible ()=0

virtual void	SetGridVisibility (BOOL bVisible)=0

virtual int	GetGridType ()=0

virtual BOOL	setBkgImageDsp (BOOL onOff)=0

virtual int	getBkgImageDsp (void)=0

virtual void	setSFDisplay (int onOff)=0

virtual int	getSFDisplay (void)=0

virtual HWND	GetHWnd ()=0

virtual BOOL	IsActive ()=0

virtual BOOL	IsEnabled ()=0

Perspective/Camera View Properties
virtual int	GetViewType ()=0

virtual BOOL	IsPerspView ()=0

virtual BOOL	IsCanvasNavigationMode ()=0

virtual float	GetFOV ()=0

virtual float	GetFocalDist ()=0

virtual void	SetFocalDist (float fd)=0

virtual INode *	GetViewCamera ()=0

virtual void	SetViewCamera (INode *camNode)=0

virtual void	SetViewUser (BOOL persp)=0

virtual INode *	GetViewSpot ()=0

virtual void	SetViewSpot (INode *spotNode)=0

Node Level Hit-testing

virtual void	ClearHitList ()=0

virtual INode *	GetClosestHit ()=0

virtual INode *	GetHit (int i)=0

virtual int	HitCount ()=0

Subobject Level Hit-testing
virtual void	LogHit (INode nr, ModContext mc, DWORD dist, ulong info, HitData *hitdata=NULL)=0
	This method records a sub-object level hit record with the system using the specified parameters. More...

virtual HitLog &	GetSubObjHitList ()=0

virtual void	ClearSubObjHitList ()=0

virtual int	NumSubObjHits ()=0

Controller Apparatus Hit-testing
virtual void	CtrlLogHit (INode *nr, DWORD dist, ulong info, DWORD infoExtra)=0

virtual CtrlHitLog &	GetCtrlHitList ()=0

virtual void	ClearCtrlHitList ()=0

AutoGrid Related Methods
virtual void	TrackImplicitGrid (IPoint2 m, Matrix3 *mat=NULL, ULONG hitTestFlags=0)=0

virtual void	CommitImplicitGrid (IPoint2 m, int mouseflags, Matrix3 *mat=NULL)=0

virtual void	ReleaseImplicitGrid ()=0

Public Member Functions inherited from InterfaceServer
virtual UtilExport	~InterfaceServer ()
	Destructor. More...

virtual UtilExport BaseInterface *	GetInterface (Interface_ID id)

Additional Inherited Members
Static Public Member Functions inherited from MaxHeapOperators
static UtilExport void *	operator new (size_t size)
	Standard new operator used to allocate objects If there is insufficient memory, an exception will be thrown. More...

static UtilExport void *	operator new (size_t size, const std::nothrow_t &e)
	Standard new operator used to allocate objects if there is insufficient memory, NULL will be returned. More...

static UtilExport void *	operator new (size_t size, const char *filename, int line)
	New operator used to allocate objects that takes the filename and line number where the new was called If there is insufficient memory, an exception will be thrown. More...

static UtilExport void *	operator new (size_t size, int block_type, const char *filename, int line)
	New operator used to allocate objects that takes the type of memory, filename and line number where the new was called If there is insufficient memory, an exception will be thrown. More...

static UtilExport void *	operator new (size_t size, const std::nothrow_t &e, const char *filename, int line)
	New operator used to allocate objects that takes the filename and line number where the new was called If there is insufficient memory, NULL will be returned. More...

static UtilExport void *	operator new (size_t size, unsigned long flags)
	New operator used to allocate objects that takes extra flags to specify special operations If there is insufficient memory, an exception will be thrown. More...

static UtilExport void *	operator new (size_t size, const std::nothrow_t &e, unsigned long flags)
	New operator used to allocate objects that takes extra flags to specify special operations If there is insufficient memory, NULL will be returned. More...

static UtilExport void *	operator new[] (size_t size)
	New operator used to allocate arrays of objects If there is insufficient memory, an exception will be thrown. More...

static UtilExport void *	operator new[] (size_t size, const std::nothrow_t &e)
	New operator used to allocate arrays of objects If there is insufficient memory, NULL will be returned. More...

static UtilExport void *	operator new[] (size_t size, const char *filename, int line)
	New operator used to allocate arrays of objects If there is insufficient memory, an exception will be thrown. More...

static UtilExport void *	operator new[] (size_t size, int block_type, const char *filename, int line)
	New operator used to allocate arrays of objects. More...

static UtilExport void *	operator new[] (size_t size, const std::nothrow_t &e, const char *filename, int line)
	New operator used to allocate arrays of objects If there is insufficient memory, NULL will be returned. More...

static UtilExport void *	operator new[] (size_t size, unsigned long flags)
	New operator used to allocate arrays of objects If there is insufficient memory, an exception will be thrown. More...

static UtilExport void *	operator new[] (size_t size, const std::nothrow_t &e, unsigned long flags)
	New operator used to allocate arrays of objects If there is insufficient memory, NULL will be returned. More...

static UtilExport void	operator delete (void *ptr)
	Standard delete operator used to deallocate an object If the pointer is invalid, an exception will be thrown. More...

static UtilExport void	operator delete (void *ptr, const std::nothrow_t &e)
	Standard delete operator used to deallocate an object If the pointer is invalid, nothing will happen. More...

static UtilExport void	operator delete (void ptr, const char filename, int line)
	Delete operator used to deallocate an object that takes the filename and line number where the delete was called If the pointer is invalid, an exception will be thrown. More...

static UtilExport void	operator delete (void ptr, int block_type, const char filename, int line)
	Delete operator used to deallocate an object that takes the type of memory, filename and line number where the delete was called If the pointer is invalid, an exception will be thrown. More...

static UtilExport void	operator delete (void ptr, const std::nothrow_t &e, const char filename, int line)
	Delete operator used to deallocate an object that takes the filename and line number where the delete was called If the pointer is invalid, nothing will happen. More...

static UtilExport void	operator delete (void *ptr, unsigned long flags)
	Delete operator used to deallocate an object that takes extra flags to specify special operations If the pointer is invalid, an exception will be thrown. More...

static UtilExport void	operator delete (void *ptr, const std::nothrow_t &e, unsigned long flags)
	Delete operator used to deallocate an object that takes extra flags to specify special operations If the pointer is invalid, nothing will happen. More...

static UtilExport void	operator delete[] (void *ptr)
	Standard delete operator used to deallocate an array of objects If the pointer is invalid, an exception will be thrown. More...

static UtilExport void	operator delete[] (void *ptr, const std::nothrow_t &e)
	Standard delete operator used to deallocate an array of objects If the pointer is invalid, nothing will happen. More...

static UtilExport void	operator delete[] (void ptr, const char filename, int line)
	Delete operator used to deallocate an array of objects that takes the filename and line number where the delete was called If the pointer is invalid, an exception will be thrown. More...

static UtilExport void	operator delete[] (void ptr, int block_type, const char filename, int line)
	Delete operator used to deallocate an array of objects that takes the type of memory, filename and line number where the delete was called If the pointer is invalid, an exception will be thrown. More...

static UtilExport void	operator delete[] (void ptr, const std::nothrow_t &e, const char filename, int line)
	Delete operator used to deallocate an array of objects that takes the filename and line number where the delete was called If the pointer is invalid, nothing will happen. More...

static UtilExport void	operator delete[] (void *ptr, unsigned long flags)
	Delete operator used to deallocate an array of objects that takes extra flags to specify special operations If the pointer is invalid, an exception will be thrown. More...

static UtilExport void	operator delete[] (void *ptr, const std::nothrow_t &e, unsigned long flags)
	Delete operator used to deallocate an array of objects that takes extra flags to specify special operations If the pointer is invalid, an exception will be thrown. More...

static UtilExport void *	operator new (size_t size, void *placement_ptr)
	Placement new operator. More...

static UtilExport void	operator delete (void ptr, void placement_ptr)
	Placement delete operator. More...

static UtilExport void *	aligned_malloc (size_t size, size_t alignment)
	Allocates memory on a specified alignment boundary. More...

static UtilExport void *	aligned_realloc (void *ptr, size_t size, size_t alignment)
	Reallocates memory on a specified alignment boundary. More...

static UtilExport void	aligned_free (void *ptr)
	Frees a block of memory that was allocated with aligned_malloc/aligned_realloc. More...

Member Enumeration Documentation

anonymous enum

Enumerator
kEXECUTE_GET_VIEWEXP_10	Command id to be passed to ViewExp::Execute in order to get the viewport's ViewExp10 interface.
kEXECUTE_GET_VIEWPORT_ID	Command id to be passed to ViewExp::Execute in order to get the viewport's unique ID (different from its index)
kEXECUTE_GET_VIEWEXP_11	Command id to be passed to ViewExp::Execute in order to get the viewport's ViewExp11 interface.
kEXECUTE_GET_VIEWEXP_13	Command id to be passed to ViewExp::Execute in order to get the viewport's ViewExp13 interface.

         {
             kEXECUTE_GET_VIEWEXP_10 = 0,
             kEXECUTE_GET_VIEWPORT_ID = 1,
             kEXECUTE_GET_VIEWEXP_11 = 2,
             kEXECUTE_GET_VIEWEXP_13 = 3,
         };

Member Function Documentation

virtual int GetViewID ( )

pure virtual

Return the unique ID of the viewport represented by the ViewExp.

NOTE: Each view panel can have 4 viewports whose indexes are usually all from 0 to 3. But their view IDs are unique. Besides, view ID is persistent during FileIO. So user can store this ID during saving. And then after loading, user can use the stored ID to retrieve the same viewExp interface by calling Interface14::GetViewExpByID(int id)

Returns: the view ID of the viewport

virtual ViewExp* ToPointer ( )

pure virtual

virtual bool IsAlive ( )

pure virtual

virtual Point3 GetPointOnCP ( const IPoint2 & ps )

pure virtual

Remarks: Returns a point in world space on the current construction plane based on the specified screen coordinate.

Parameters

ps	The 2D screen point to convert to a 3D world space coordinate.

Returns: The world space coordinate on the current construction plane.

virtual Point3 SnapPoint	(	const IPoint2 &	in,
		IPoint2 &	out,
		Matrix3 *	plane2d = `NULL`,
		DWORD	flags = `0`
	)

pure virtual

Remarks: Given a 2D screen coordinate, this method returns a 3D point on the current construction plane based on the current snap settings and flags passed.

Parameters

in	The 2D screen coordinate to snap.
out	The snapped 2D screen coordinate. This is used if you need to move the mouse position to the snapped location.
plane2d	This optional argument allows you to use any plane (not just the current construction plane).
flags	See Snap Flags.

Returns: The snapped 3D point in construction plane coordinates.

virtual void SnapPreview	(	const IPoint2 &	in,
		IPoint2 &	out,
		Matrix3 *	plane2d = `NULL`,
		DWORD	flags = `0`
	)

pure virtual

Remarks: This is a method used as part of the osnap system in 3ds Max. It is the method that displays the snap marker in the viewports prior to the first point event. It's really just a call to SnapPoint() which returns nothing. This method should be called in response to a MOUSE_FREEMOVE event from any creation or transformation proc which calls SnapPoint(). Here's an example creation proc:

Sample Code:: int PointHelpObjCreateCallBack::proc(ViewExp *vpt,int msg, int point, int flags, IPoint2 m, Matrix3& mat )

{

if (msg == MOUSE_FREEMOVE)

// Show a preview snap in the viewport prior to the

// first point event.

vpt->SnapPreview(m,m,NULL, SNAP_IN_3D);

if (msg==MOUSE_POINT||msg==MOUSE_MOVE)

{

switch(point)

{

case 0:

ob->suspendSnap = TRUE;

mat.SetTrans(vpt->SnapPoint(m,m,NULL,SNAP_IN_3D));

break;

case 1:

mat.SetTrans(vpt->SnapPoint(m,m,NULL,SNAP_IN_3D));

if (msg==MOUSE_POINT)

{

ob->suspendSnap = FALSE;

return 0;

}

break;

}

}

else if (msg == MOUSE_ABORT)

{

return CREATE_ABORT;

}

return 1;

}

Parameters

in	The 2D screen coordinate to snap.
out	The snapped 2D screen coordinate. This is used if you need to move the mouse position to the snapped location.
plane2d	This optional argument allows you to use any plane (not just the current construction plane).
flags	See Snap Flags.

virtual void GetGridDims	(	float *	MinX,
		float *	MaxX,
		float *	MinY,
		float *	MaxY
	)

pure virtual

Remarks: This method is used internally. It fills up it's arguments with the world space extents of the home grid (i.e. the extents of the grid as displayed). It doesn't work for grid helper which always display to their size limits. This was exposed so 3ds Max could do the grid snapping and is not needed by plug-in developers.

virtual float SnapLength ( float in )

pure virtual

Remarks: Given the distance passed, this method snaps the length to the nearest snap increment and returns the snapped distance.

Parameters

in	The input distance to be snapped.

Returns: The snapped distance.

virtual float GetCPDisp	(	const Point3	base,
		const Point3 &	dir,
		const IPoint2 &	sp1,
		const IPoint2 &	sp2,
		BOOL	snap = `FALSE`
	)

pure virtual

Remarks: This method returns a length in world space given a start screen point, an end screen point, a base point and a direction vector. For example, when creating a cylinder, the user clicks the mouse down to define the center point of the cylinder (base), then drags out a radius. They then drag out a height for the cylinder. This method is used to return intermediate and final heights for the cylinder based on the initial base point, the direction vector (the Z axis), the start mouse point, and the current point the user is interactively adjusting.

Parameters

base	Base point in object space.
dir	Direction vector in object space.
sp1	Screen start point. This is the point where the user clicked down with the mouse.
sp2	Screen end point. This is the point where the user let up the mouse.
snap

Returns: The length in world space based on the screen points and their projection onto the direction vector.

Sample Code:: float h = vpt->SnapLength(vpt->GetCPDisp(p[1],Point3(0,0,1),sp1,m));

From /MAXSDK/SAMPLES/OBJECTS/CYL.CPP in CylinderObjCreateCallBack::proc

virtual GraphicsWindow* getGW ( )

pure virtual

Remarks: Returns a pointer to the instance of GraphicsWindow associated with this viewport.

Note: A GraphicsWindow always has a transform associated with it, for faster object-to-screen space conversions. The GraphicsWindow * returned by this method may have a non-identity transform already in place. A developer can call gw->setTransform() with a node's transform for fast work in Display routines. But this value must be explicitly set to the identity for world-to-screen displays.

virtual int IsWire ( )

pure virtual

Remarks: Determines if this viewport is in wire-frame rendering mode (as opposed to a shaded mode).

Returns: Nonzero if the viewport is in wire-frame rendering mode; otherwise 0.

virtual Rect GetDammageRect ( )

pure virtual

Remarks: Returns the damaged rectangle of the viewport. This is the area that needs to be updated on the next screen refresh. This can be used for example, to pass into the Mesh method render() to only display the damaged area of the object. A developer could also use this in the implementation of their own Display() method.

Sample Code:: int SimpleObject::Display(TimeValue t, INode* inode, ViewExp *vpt, int flags)

{

if (!OKtoDisplay(t))

return 0;

GraphicsWindow *gw = vpt->getGW();

Matrix3 mat = inode->GetObjectTM(t);

UpdateMesh(t); // UpdateMesh() just calls BuildMesh()

gw->setTransform(mat);

mesh.render(gw, inode->Mtls(), (flags&USE_DAMAGE_RECT) ? &vpt->GetDammageRect() : NULL,

COMP_ALL, inode->NumMtls());

return(0);

}

virtual Point2 MapViewToScreen ( const Point3 & p )

pure virtual

Remarks: Given a point with view coordinates, this method maps the point into screen(windows) coordinates.

Parameters

p	Point in view coordinates.

Returns: Point in screen coordinates.

Sample Code:: Point2 p0 = vpt->MapScreenToView(affinePos);

virtual Point3 MapScreenToView	(	IPoint2 &	sp,
		float	depth
	)

pure virtual

Remarks: Given a point on the screen (in window coordinates), and a depth in view coordinates, this method maps the point into view coordinates. This is just a scaling operation for parallel projections, but involves a divide by Z for perspective projections.

Parameters

sp	Point in window coordinates.
depth	Depth in view coordinates.

Returns: Point in view coordinates.

Sample Code:: Point3 p0 = vpt->MapScreenToView(mBase,GetPerspMouseSpeed());

virtual void MapScreenToWorldRay	(	float	sx,
		float	sy,
		Ray &	ray
	)

pure virtual

Remarks: Creates a Ray in world space passing through the specified pixel directed toward the scene in the direction of view.

Parameters

sx	The x screen coordinate.
sy	The y screen coordinate.
ray	The Ray in world space. See Class Ray.

virtual BOOL SetAffineTM ( const Matrix3 & m )

pure virtual

Remarks: This method sets the viewport affine transformation and returns TRUE if the view is a user view (isometric or perspective). If the view is not a user view then the transformation is not changed and the method returns FALSE. See SetViewUser() below.

Parameters

m	The transformation matrix to set.

virtual void GetAffineTM ( Matrix3 & tm )

pure virtual

Remarks: This method retrieves the affineTM which transforms from World coordinates to View coordinates. See the sample code below for an example of its use.

Parameters

tm

The matrix to hold the affine TM.

// This routine returns the view direction from the active viewport.
Point3 Utility::GetViewDirection()
{
    Matrix3 aTM, coordSysTM;
    ViewExp& ve = ip->GetActiveViewExp();
    // The affine TM transforms from world coords to view coords
    // so we need the inverse of this matrix
    ve.GetAffineTM(aTM);
    coordSysTM = Inverse(aTM);
    // The Z axis of this matrix is the view direction.
    Point3 viewDir = coordSysTM.GetRow(2);
    return viewDir;
}

Note: You can also get the view position from this matrix. For example, in the above code, the statement: Point3 viewPt = coordSysTM.GetRow(3); gets the point in space the view is taken from.

virtual int GetViewType ( )

pure virtual

Remarks: Returns the type of view. One of the following values:

enum ViewType {

VIEW_LEFT,VIEW_RIGHT,VIEW_TOP,VIEW_BOTTOM,VIEW_FRONT,VIEW_BACK,

VIEW_ISO_USER, VIEW_PERSP_USER, VIEW_CAMERA, VIEW_GRID, VIEW_NONE,

VIEW_TRACK, VIEW_SPOT, VIEW_SHAPE, VIEW_SCHEMATIC, VIEW_OTHER

};

virtual BOOL IsPerspView ( )

pure virtual

Remarks: Returns TRUE if the viewport is a perspective view; otherwise returns FALSE.

virtual BOOL IsCanvasNavigationMode ( )

pure virtual

Remarks: Returns TRUE if the viewport is 2D canvas navigation mode; otherwise returns FALSE.

virtual float GetFOV ( )

pure virtual

Remarks: Returns the field of view of a perspective viewport in radians.

virtual float GetFocalDist ( )

pure virtual

Remarks: Returns the focal distance of a perspective view.

virtual void SetFocalDist ( float fd )

pure virtual

Remarks: Sets the focal distance of a perspective view.

Parameters

fd	Specifies the focal distance to set.

virtual float GetFPS ( )

pure virtual

Get the FPS from the active viewport.

Returns: Return the frame per second of the active viewport.

virtual float GetScreenScaleFactor ( const Point3 worldPoint )

pure virtual

Remarks: Returns the screen scale factor for a point given in world coordinates. This factor gives the width in world-space units at the point's distance of the viewport.

Parameters

worldPoint The point in world coordinates.

Returns: The screen scale factor in world space units.

virtual float GetVPWorldWidth ( const Point3 wPoint )

pure virtual

Remarks: Returns the viewport screen width factor in world space at a point in world space.

Parameters

wPoint The point in world space.

Returns: The viewport screen width factor in world space.

virtual Point3 MapCPToWorld ( const Point3 cpPoint )

pure virtual

Remarks: Given a point on the construction plane this method returns the corresponding world space point. For example, if you use GetPointOnCP() to convert a screen coordinate to a point on the construction plane, you could then call this method to convert that point on the construction plane to a world space point.

Parameters

cpPoint The point on the construction plane.

Returns: The world space point.

virtual float NonScalingObjectSize ( )

pure virtual

Remarks: The value returned from this method may be used as a scale factor that will counteract the viewport zoom. For example, lights, cameras, and tape helper objects use this factor so the size of the node in the scene remains constant when the viewport is zoomed in and out.

This value is affected by the 'Non-Scaling Object Size' spinner in the Viewport Preferences dialog, so the user has some control over this as well.

Sample Code:: This sample is from /MAXSDK/SAMPLES/OBJECTS/TAPEHELP.CPP. The computed matrix is used in several places like displaying, snapping, hit testing, etc.
void TapeHelpObject::GetMat(TimeValue t, INode* inode,

ViewExp* vpt, Matrix3& tm)

{

tm = inode->GetObjectTM(t);

tm.NoScale();

float scaleFactor = vpt->NonScalingObjectSize() *

vpt->GetVPWorldWidth(tm.GetTrans())/(float)360.0;

tm.Scale(Point3(scaleFactor,scaleFactor,scaleFactor));

}

virtual void GetConstructionTM ( Matrix3 & tm )

pure virtual

Remarks: Retrieves the transformation matrix of the construction plane.

Parameters

tm	The transformation matrix is returned here.

virtual void SetGridSize ( float size )

pure virtual

Remarks: Sets the size of the construction grid spacing.

Parameters

size	Specifies the grid spacing.

virtual float GetGridSize ( )

pure virtual

Remarks: Returns the construction grid spacing. This is the grid spacing on a per viewport basis. It is dependent on how far zoomed in or out the user is. This is the exact same value that you can see in the right most status panel below the viewports.

virtual BOOL IsGridVisible ( )

pure virtual

Remarks: Returns TRUE if the grid is turned on for this viewport; otherwise FALSE.

virtual void SetGridVisibility ( BOOL bVisible )

pure virtual

Remarks: Set the grid visibility for this viewport.

virtual int GetGridType ( )

pure virtual

Remarks: Returns the grid type. One of the following values (from OBJECT.H):

GRID_PLANE_NONE

GRID_PLANE_TOP

GRID_PLANE_LEFT

GRID_PLANE_FRONT

GRID_PLANE_BOTTOM

GRID_PLANE_RIGHT

GRID_PLANE_BACK

virtual INode* GetViewCamera ( )

pure virtual

Remarks: Returns the INode pointer of the camera associated with this viewport. If this is not a camera view then NULL is returned.

virtual void SetViewCamera ( INode * camNode )

pure virtual

Remarks: Set this viewport to a camera view.

Parameters

camNode The camera node to set.

virtual void SetViewUser ( BOOL persp )

pure virtual

Remarks: This method sets the viewport to be a user view, with the persp argument indicating whether this should be a perspective or iso view. Note that the user viewport defaults are used for field-of-view, etc.

Parameters

persp TRUE for perspective; FALSE for isometric.

virtual INode* GetViewSpot ( )

pure virtual

Remarks: Returns the INode pointer of the spotlight associated with this viewport. If this is not a spotlight view then NULL is returned.

virtual void SetViewSpot ( INode * spotNode )

pure virtual

Remarks: Set this viewport to a spotlight view.

Parameters

spotNode The spotlight node to set.

virtual void ClearHitList ( )

pure virtual

Remarks: Implemented by the System.

Clears the list of node level hit records.

virtual INode* GetClosestHit ( )

pure virtual

Remarks: Implemented by the System.

Returns the INode pointer of the node that was the closest of all those hit. If none were hit, NULL is returned.

virtual INode* GetHit ( int i )

pure virtual

Remarks: Returns the INode pointer of the 'i-th' node level hit.

Parameters

i	The index of the hit to retrieve.

virtual int HitCount ( )

pure virtual

Remarks: Implemented by the System.

Returns the number of hits recorded by the last node level hit test.

virtual void LogHit	(	INode *	nr,
		ModContext *	mc,
		DWORD	dist,
		ulong	info,
		HitData *	hitdata = `NULL`
	)

pure virtual

This method records a sub-object level hit record with the system using the specified parameters.

This hit can later be retrieved using the method GetSubObjHitList() and the methods of class HitLog.

Parameters

nr	The node that was hit.
mc	The ModContext of the modifier.
dist	The 'distance' of the hit. What the distance actually represents depends on the rendering level of the viewport. For wireframe modes, it refers to the distance in the screen XY plane from the mouse to the sub-object component. In a shaded mode, it refers to the Z depth of the sub-object component. In both cases, smaller values indicate that the sub-object component is 'closer' to the mouse cursor.
info	Identifies the sub-object component that was hit.
hitdata	If the info data member is insufficient to indicate the sub-object component that was hit, pass an instance of the HitData class that contains the needed information. The system will be responsible for freeing the memory for the HitData.

virtual HitLog& GetSubObjHitList ( )

pure virtual

Remarks: Returns the sub-object hit list. See Class HitLog.

virtual void ClearSubObjHitList ( )

pure virtual

Remarks: Clears the sub-object hit list. This deletes all previously saved HitRecords.

virtual int NumSubObjHits ( )

pure virtual

Remarks: Returns the number of sub-object hits recorded.

virtual void CtrlLogHit	(	INode *	nr,
		DWORD	dist,
		ulong	info,
		DWORD	infoExtra
	)

pure virtual

Remarks: This method records a controller sub-object level hit record with the system using the specified parameters. This hit can later be retrieved using the method GetCtrlHitList() and the methods of class CtrlHitLog.

Parameters

nr	The node that was hit.
dist	The 'distance' of the hit. What the distance actually represents depends on the rendering level of the viewport. For wireframe modes, it refers to the distance in the screen XY plane from the mouse to the sub-object component. In a shaded mode, it refers to the Z depth of the sub-object component. In both cases, smaller values indicate that the sub-object component is 'closer' to the mouse cursor.
info	A general unsigned long value. Most controllers will just need this to identity the sub-object element. The meaning of this value (how it is used to identify the element) is up to the plug-in.
infoExtra	If the above hitInfo data member is not sufficient to describe the sub-object element this data member may be used as well.

virtual CtrlHitLog& GetCtrlHitList ( )

pure virtual

Remarks: Returns the list of controller gizmo hits recorded. See Class CtrlHitLog.

virtual void ClearCtrlHitList ( )

pure virtual

Remarks: Clears the controller hit list. This deletes all the HitRecords previously recorded.

virtual BOOL setBkgImageDsp ( BOOL onOff )

pure virtual

Remarks: This method is used to turn on and off the background image display in this viewport. Note that it is necessary to redraw the viewports in order to see the effect of this method. Use the method Interface::RedrawViews() to do this.

Parameters

onOff TRUE to turn the background image on; FALSE to turn it off.

Returns: TRUE if the image was set; otherwise FALSE.

virtual int getBkgImageDsp ( void )

pure virtual

Remarks: Returns nonzero if the background image is displayed in this viewport; otherwise 0.

virtual void setSFDisplay ( int onOff )

pure virtual

Remarks: This method may be used to turn the safe frame display on and off in this viewport.

Parameters

onOff Nonzero to turn on the safe frame; zero to turn it off.

virtual int getSFDisplay ( void )

pure virtual

Remarks: Returns nonzero if the safe frame is displayed in this viewport; otherwise 0.

virtual HWND GetHWnd ( )

pure virtual

Remarks: This returns the window handle of the viewport - this is the transparent window that catches mouse input. Note that this window handle is different than the handle that can be retrieved from the viewport's GraphicsWindow. getGW()->getHWnd() is the window that things are drawn on.

Returns: The window handle of the viewport.

virtual BOOL IsActive ( )

pure virtual

Remarks: Returns TRUE if the viewport is the active on; otherwise FALSE.

virtual BOOL IsEnabled ( )

pure virtual

Remarks: Returns TRUE if the viewport is enabled; FALSE if disabled.

virtual void SetSolidBackgroundColorMode ( bool bSolidColor )

pure virtual

Set the viewport background color mode as solid color mode or gradient color mode.

Parameters

[in] bSolidColor if true, solid color mode will be set. Otherwise set gradient color mode will be set.

virtual bool IsSolidBackgroundColorMode ( )

pure virtual

Get the current viewport background color mode.

Returns: Return true if in solid color mode. Return false if in gradient color mode.

virtual void ResetBackgroundColorMode ( )

pure virtual

Reset viewport background color mode.

virtual void TrackImplicitGrid	(	IPoint2	m,
		Matrix3 *	mat = `NULL`,
		ULONG	hitTestFlags = `0`
	)

pure virtual

Remarks: If AutoGrid is enabled, this method determines a grid coordinate system by casting a ray into the scene through the screen coordinate m, obtaining a surface normal from the closest node , and using the "arbitrary axis algorithm" to orient the xy axes. You can get this coordinate system back by passing in a pointer to a matrix. A tripod is displayed in the viewports showing the orientation.

Parameters

m	The 2D screen point that the user clicked on.
mat	The implicit grid coordinate system matrix can be retrieved by passing a pointer to a matrix here.
hitTestFlags	See Scene and Node Hit Testing Flags.

virtual void CommitImplicitGrid	(	IPoint2	m,
		int	mouseflags,
		Matrix3 *	mat = `NULL`
	)

pure virtual

Remarks: If AutoGrid is enabled, this method creates a grid and activates it. The mouseflags parameter is used to determine if the ALT key is down. If it is, this grid will not be deactivated in ReleaseImplicitGrid()(below).

Parameters

m	The 2D screen point that the user clicked on.
mouseflags	These flags describe the state of the mouse buttons. See Mouse Call Back Flags.
mat	Developers can get the implicit grid coordinate system back by passing in a pointer to a matrix here.

virtual void ReleaseImplicitGrid ( )

pure virtual

Remarks: This method deactivates an implicit grid and restores the previously active grid. If the implicit grid was committed with ALT-key held down, then this call does nothing.

virtual void InvalidateRect ( const Rect & rect )

pure virtual

Remarks: This is a better way method to invalidate a viewport only if the area define by the Rect argument is not the whole size of the viewport. Calling InvalidateRect on a Rect defined like this: rect.top = 0; rect.bottom = gw->getWinSizeY(); rect.left = 0; rect.right = gw->getWinSizeX(); Will have the same effect of invalidating the viewport.

Parameters

rect	The Rect that define the region on the viewport to be invalidated.

virtual INT_PTR Execute	(	int	cmd,
		ULONG_PTR	arg1 = `0`,
		ULONG_PTR	arg2 = `0`,
		ULONG_PTR	arg3 = `0`
	)

inlinevirtual

Remarks: This is a general purpose function that allows the API to be extended in the future. The 3ds Max development team can assign new cmd numbers and continue to add functionality to this class without having to 'break' the API.

Parameters

cmd	The index of the command to execute.
arg1	Optional argument 1. See the documentation where the cmd option is discussed for more details on these parameters.
arg2	Optional argument 2.
arg3	Optional argument 3.

Returns: An integer return value. See the documentation where the cmd option is discussed for more details on the meaning of this value.

         {
             UNUSED_PARAM(cmd);
             UNUSED_PARAM(arg1);
             UNUSED_PARAM(arg2);
             UNUSED_PARAM(arg3);
             return 0;
         }

ViewExp Class Reference

Class Description

Public Types

Public Member Functions

Additional Inherited Members

Member Enumeration Documentation

Member Function Documentation