Detailed Description

See also:: Class Mesh, Class MNMesh, Class PatchMesh

Description:: ObjectWrapper providing a common interface to Mesh, MNMesh, and PatchMesh objects.
All methods of this class are implemented by the system.

The ObjectWrapper provides a common interface to three common classes of geometry objects, Mesh, MNMesh and PatchMesh, and is helpful when writing reusable code that is not type-dependant. Specifically, the ObjectWrapper is intended for use in Modifier plug-ins, when a developer wants to avoid writing three versions of code for the three object types. Note that objects of other types, such as NURBS and Particle Systems, are not directly supported by the ObjectWrapper, although the wrapper can attempt to convert them to a supported type.

The ObjectWrapper defines an abstracted concept of vertices, faces, and edges. Vertices are defined as points in space; for PatchMesh objects, these are the patch knots. Faces are defined as either triangles, polygons or patches, according to the object type. For MNMesh objects, no access is provided to the flag values of the vertices. For PatchMesh objects, no access is provided to the patch handles; methods which set the position of a vertex will move the patch knot and attempt to maintain the position of the handles relative to the knot.

ObjectWrappers do not have a class ID or a class descriptor, and are not part of the reference hierarchy. They can be instantiated like primitive types using new() and delete(). The Init() method assigns a specific object to the wrapper after the wrapper is created.

Note that using ObjectWrappers may incur a small performance penalty, because every method of the class must branch into the appropriate type-specific method, and is therefore slower than calling type-specific methods directly.

#include <ObjectWrapper.h>

Inheritance diagram for ObjectWrapper:

Public Types
enum	{ empty = 0, triObject, polyObject, patchObject }
	The type of the underlying object, triObject for Mesh, polyObject for MNMesh, and patchObject for PatchMesh. More...
enum	{ noneEnable = 0, triEnable = 1, polyEnable = 2, patchEnable = 4, allEnable = 0x7 }
enum	{ iv_none = 0x000, iv_verts = 0x001, iv_faces = 0x002, iv_edges = 0x004 }
enum	{ SEL_OBJECT, SEL_VERT, SEL_FACE, SEL_ELEM }
	Selection enum values. More...
enum	{ SUBHIT_IGNOREBACKFACING = (1<<5) }
Public Member Functions
CoreExport	ObjectWrapper ()
	Constructor. The wrapper is set to an empty, uninitialized state.
CoreExport	~ObjectWrapper ()
	Destructor. Calls the Release() method to free any memory used by the wrapper.
CoreExport void	Zero ()
	For internal use only.
CoreExport BOOL	Init (TimeValue t, ObjectState &os, BOOL copy=FALSE, int enable=allEnable, int nativeType=polyObject)
CoreExport void	Release ()
CoreExport BOOL	IsEmpty ()
CoreExport int	Type ()
CoreExport Mesh *	GetTriMesh ()
CoreExport MNMesh *	GetPolyMesh ()
CoreExport PatchMesh *	GetPatchMesh ()
CoreExport void	Invalidate (int iInvalid)
CoreExport void	InvalidateGeomCache ()
CoreExport int	NumVerts ()
CoreExport int	NumFaces ()
CoreExport int	NumEdges ()
CoreExport Point3 *	Verts ()
CoreExport GenFace *	Faces ()
CoreExport GenEdge *	Edges ()
CoreExport Point3 *	GetVert (int index)
CoreExport void	SetVert (int index, Point3 &p)
CoreExport void	SetNumVerts (int num)
CoreExport GenFace	GetFace (int index)
CoreExport void	SetFace (int index, GenFace &face)
CoreExport void	SetNumFaces (int num)
CoreExport GenEdge	GetEdge (int index)
CoreExport int	NumFaceEdges (int faceIndex)
CoreExport int	GetFaceEdgeIndex (int faceIndex, int edgeIndex)
CoreExport void	GetVertexSpace (int index, Matrix3 &tm)
CoreExport Point3 *	GetVertexNormal (int index)
CoreExport BOOL	GetFaceHidden (int faceIndex)
CoreExport void	SetFaceHidden (int faceIndex, BOOL hidden)
CoreExport BOOL	GetChannelSupport (int mapChannel)
CoreExport void	SetChannelSupport (int mapChannel, BOOL b)
CoreExport int	NumMapVerts (int channel)
CoreExport void	SetNumMapVerts (int channel, int num)
CoreExport Point3 *	GetMapVert (int channel, int index)
CoreExport void	SetMapVert (int channel, int index, Point3 &p)
CoreExport GenFace	GetMapFace (int channel, int index)
CoreExport void	SetMapFace (int channel, int index, GenFace &face)
CoreExport MtlID	GetMtlID (int index)
CoreExport void	SetMtlID (int index, MtlID mtlID)
CoreExport DWORD	GetSmoothingGroup (int index)
CoreExport void	SetSmoothingGroup (int index, DWORD smGrp)
CoreExport int	GetSelLevel ()
CoreExport void	SetSelLevel (int selLevel)
CoreExport BitArray &	GetVertSel ()
CoreExport void	SetVertSel (BitArray &)
CoreExport BitArray &	GetFaceSel ()
CoreExport void	SetFaceSel (BitArray &sel)
CoreExport BitArray &	GetElemSel ()
CoreExport void	SetElemSel (BitArray &sel)
CoreExport BitArray *	GetSel (int selLevel)
CoreExport void	SetSel (int selLevel, BitArray &sel)
CoreExport void	FaceToElemSel (BitArray &elemSel, BitArray &faceSel)
	Converts the bits representing a face selection into bits representing an element selection, and expands the selection accordingly.
CoreExport void	GrowSelection (int selLevel, BitArray &newSel)
CoreExport void	ShrinkSelection (int selLevel, BitArray &newSel)
CoreExport void	GetSoftSel (GenSoftSelData &softSelData)
CoreExport void	SetSoftSel (GenSoftSelData &softSelData)
CoreExport void	UpdateSoftSel ()
CoreExport float *	SoftSelWeights ()
CoreExport Point3	SoftSelColor (float f)
CoreExport BOOL	SubObjectHitTest (int selLevel, GraphicsWindow gw, Material ma, HitRegion hr, DWORD flags, HitListWrapper &hitList, int numMat=1, Matrix3 mat=NULL)
CoreExport int	IntersectRay (Ray &ray, float &intersectAt, Point3 &norm, int &fi, FloatTab &bary)
CoreExport void	Render (GraphicsWindow gw, Material ma, RECT *rp, int compFlags, int numMat=1)
CoreExport int	SelLevel (int selLevel)
CoreExport int	HitLevel (int selLevel)
Public Attributes
enum ObjectWrapper:: { ... }	type
Mesh *	mesh
MNMesh *	poly
PatchMesh *	patch
MeshTempData *	meshTempData
MNTempData *	polyTempData
Protected Attributes
TimeValue	t
union {
Mesh * mesh
MNMesh * poly
PatchMesh * patch
};
union {
MeshTempData * meshTempData
MNTempData * polyTempData
};
BOOL	isCopy
Point3 *	verts
GenFace *	faces
GenEdge *	edges
GeomObject *	collapsedObj
BitArray	faceSel
BitArray	vertSel
GenSoftSelData	softSelData
int	invalidMask

Member Enumeration Documentation

anonymous enum

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The type of the underlying object, triObject for Mesh, polyObject for MNMesh, and patchObject for PatchMesh.

Enumerator:

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triObject	Search for all occurrences
polyObject	Search for all occurrences
patchObject	Search for all occurrences

{ empty=0, triObject, polyObject, patchObject } type;

anonymous enum

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Enumerator:

noneEnable	Search for all occurrences
triEnable	Search for all occurrences
polyEnable	Search for all occurrences
patchEnable	Search for all occurrences
allEnable	Search for all occurrences

{ noneEnable=0, triEnable=1, polyEnable=2, patchEnable=4, allEnable=0x7 };

anonymous enum

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Enumerator:

iv_none	Search for all occurrences
iv_verts	Search for all occurrences
iv_faces	Search for all occurrences
iv_edges	Search for all occurrences

{ iv_none=0x000, iv_verts=0x001, iv_faces=0x002, iv_edges=0x004 };

anonymous enum

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Selection enum values.

Enumerator:

SEL_OBJECT	indicates the object selection level. Search for all occurrences
SEL_VERT	indicates the face selection level. Search for all occurrences
SEL_FACE	indicates the vertex selection level. Search for all occurrences
SEL_ELEM	indicates the element selection level. Search for all occurrences

             {
            SEL_OBJECT, 
            SEL_VERT, 
            SEL_FACE,
            SEL_ELEM
        }; //selection enum values

anonymous enum

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Enumerator:

SUBHIT_IGNOREBACKFACING

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{ SUBHIT_IGNOREBACKFACING=(1<<5) }; //other SUBHIT_... values defined in Mesh.h are also supported

Constructor & Destructor Documentation

CoreExport ObjectWrapper ( )

Constructor. The wrapper is set to an empty, uninitialized state.

CoreExport ~ObjectWrapper ( ) [inline]

Destructor. Calls the Release() method to free any memory used by the wrapper.

{Release();}

Member Function Documentation

CoreExport void Zero ( )

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For internal use only.

CoreExport BOOL Init	(	TimeValue	t,
		ObjectState &	os,
		BOOL	copy = `FALSE`,
		int	enable = `allEnable`,
		int	nativeType = `polyObject`
	)

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Remarks:: Assign an object to the ObjectWrapper. If the object is not a supported type (specified by the enable flags), it will be converted, and a copy of the converted object is held internally.

Parameters:

t	- The current slider time
os	- The object
copy	- True to make a duplicate of the object, False otherwise
enable	- Flags indicating which types should be supported. The object will be converted to the native type (and a copy maintained) unless it is one of these supported types. For Mesh objects, set the bit ObjectWrapper::triEnable. For MNMesh objects, set the bit ObjectWrapper::polyEnable. For Patch objects, set the bit ObjectWrapper::patchEnable.
nativeType	- Indicates which type to convert to, if the object is not already a supported type. For Mesh, pass ObjectWrapper::triObject. For MNMesh, pass ObjectWrapper::polyObject. For PatchMesh, pass ObjectWrapper::patchObject.

Returns:: True if the operation succeeds, False otherwise.

CoreExport void Release ( )

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Remarks:: Release internal data, and reset to an empty state. If the underlying object was copied or converted to a different type by the Init() method, then the ObjectWrapper maintains a copy internally, consuming a significant amount of memory. Calling this method is important to free the internal copy.

CoreExport BOOL IsEmpty ( ) [inline]

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Remarks:: Indicates whether the wrapper is currently empty

Returns:: True if no object is assigned to the wrapper, False otherwise

{return type==empty;}

CoreExport int Type ( ) [inline]

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Remarks:: Indicates the type of the underlying object

Returns:: For Mesh, returns ObjectWrapper::triObject. For MNMesh, returns ObjectWrapper::polyObject. For PatchMesh, returns ObjectWrapper::patchObject.

{return type;}

CoreExport Mesh* GetTriMesh ( ) [inline]

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Remarks:: Returns the Mesh object pointer, or NULL if the underlying object is not type Mesh

{return type==triObject? mesh:NULL;}

CoreExport MNMesh* GetPolyMesh ( ) [inline]

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Remarks:: Returns the Mesh object pointer, or NULL if the underlying object is not type MNMesh

{return type==polyObject? poly:NULL;}

CoreExport PatchMesh* GetPatchMesh ( ) [inline]

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Remarks:: Returns the PatchMesh object pointer, or NULL if the underlying object is not type PatchMesh

{return type==patchObject? patch:NULL;}

CoreExport void Invalidate ( int iInvalid )

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Remarks:: Clear the validity mask for verts, faces, or edges. The validity mask applies when calling the methods Verts(), Faces() and Edges(). These methods maintain internal copies of data from the underlying object. Clearing the validity flags ensures that the next call to one of these methods will allocate a new, updated list instead of returning a stale list. The validity flag for a channel should be cleared whenever the channel is modifier. However, ObjectWrapper methods will mark the flags automatically, so it is not necessary to call this method unless the underlying object is being modified outside of the ObjectWrapper.

Parameters:

iInvalid - The validity flags to clear. To clear the vertex channel, pass ObjectWrapper::iv_verts. To clear the face channel, pass ObjectWrapper::iv_faces. To clear the edge channel, pass ObjectWrapper::iv_edges.

CoreExport void InvalidateGeomCache ( )

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Remarks:: Calls the method InvalidateGeomCache() on the underlying object

CoreExport int NumVerts ( )

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Remarks:: Returns the number of geometric vertices

CoreExport int NumFaces ( )

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Remarks:: Returns the number of geometric faces

CoreExport int NumEdges ( )

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Remarks:: Returns the number of geometry edges

CoreExport Point3* Verts ( )

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Remarks:: Returns an array of the geometric vertices. Note that this method incurs a memory usage penalty because it allocates an internal cache. If this method is called when the vertex channel has been invalidated, it will update the cache, which incurs an additional performance penalty

CoreExport GenFace* Faces ( )

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Remarks:: Returns an array of the geometric faces. Note that this method incurs a memory usage penalty because it allocates an internal cache. If this method is called when the face channel has been invalidated, it will update the cache, which incurs an additional performance penalty.

See also:: Class GenFace

CoreExport GenEdge* Edges ( )

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Remarks:: Returns an array of the geometric edges. Note that this method incurs a memory usage penalty because it allocates an internal cache. If this method is called when the edge channel has been invalidated, it will update the cache, which incurs an additional performance penalty.

See also:: Class GenEdge

CoreExport Point3* GetVert ( int index )

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Remarks:: Returns an individual geometric vertex

Parameters:

index - The index of the vertex to retrieve

CoreExport void SetVert	(	int	index,
		Point3 &	p
	)

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Remarks:: Sets the position of a geometric vertex

Parameters:

index	- The index of the vertex to set
p	- The position of the vertex

CoreExport void SetNumVerts ( int num )

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Remarks:: Sets the number of geometric verts in the object

Parameters:

num	- The vertex count

CoreExport GenFace GetFace ( int index )

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Remarks:: Returns an individual geometric face

Parameters:

index - The index of the face to retrieve

CoreExport void SetFace	(	int	index,
		GenFace &	face
	)

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Remarks:: Sets the data for geometric face

Parameters:

index	- The index of the face to set
face	- The data for the face

CoreExport void SetNumFaces ( int num )

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Remarks:: Sets the number of geometric faces in the object

Parameters:

num	- The face count

CoreExport GenEdge GetEdge ( int index )

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Remarks:: Returns an individual geometric edge

Parameters:

index - The index of the edge to retrieve

CoreExport int NumFaceEdges ( int faceIndex )

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Remarks:: Returns the number of edges bordering a specified geometric face

Parameters:

faceIndex - The index of the face

CoreExport int GetFaceEdgeIndex	(	int	faceIndex,
		int	edgeIndex
	)

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Remarks:: Returns the index number of an edge bordering a specified geometric face

Parameters:

faceIndex	- The index of the face
edgeIndex	- The index of the edge relative to the face

CoreExport void GetVertexSpace	(	int	index,
		Matrix3 &	tm
	)

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Remarks:: For MNMesh objects, this calls MNMesh::GetVertexSpace(). For other types, this calls MatrixFromNormal() on the vertex normal.

Parameters:

	index	- The index of the vertex
[out]	tm	- The vertex space matrix

CoreExport Point3* GetVertexNormal ( int index )

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Remarks:: Returns the geometric normal of a vertex

Parameters:

index - The index of the vertex

CoreExport BOOL GetFaceHidden ( int faceIndex )

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CoreExport void SetFaceHidden	(	int	faceIndex,
		BOOL	hidden
	)

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CoreExport BOOL GetChannelSupport ( int mapChannel )

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Remarks:: Returns TRUE if the specified mapping channel is supported; otherwise FALSE.

See also:: List of Mapping Channel Index Values.

Parameters:

mapChannel - The index of the map channel

CoreExport void SetChannelSupport	(	int	mapChannel,
		BOOL	b
	)

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Remarks:: Sets whether the specified mapping channel is supported or not.

See also:: List of Mapping Channel Index Values.

Parameters:

mapChannel	- The index of the map channel
b	- TRUE to indicate the channel is supported; otherwise FALSE.

CoreExport int NumMapVerts ( int channel )

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Remarks:: Returns the number of texture or vertex color vertices for the specified mapping channel.

Parameters:

channel - The index of the map channel

CoreExport void SetNumMapVerts	(	int	channel,
		int	num
	)

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Remarks:: Sets the number of texture or vertex color vertices for the specified mapping channel.

Parameters:

channel	- The index of the map channel
num	- The number of vertices to allocate.

CoreExport Point3* GetMapVert	(	int	channel,
		int	index
	)

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Remarks:: Returns a single texture or vertex color value for the specified mapping channel.

Parameters:

channel	- The index of the map channel
index	- The index of the texture vertex

CoreExport void SetMapVert	(	int	channel,
		int	index,
		Point3 &	p
	)

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Remarks:: Sets a single texture or vertex color value for the specified mapping channel.

Parameters:

channel	- The index of the map channel
index	- The index of the texture vertex
p	- The value to set

CoreExport GenFace GetMapFace	(	int	channel,
		int	index
	)

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Remarks:: Returns an individual texture mapping face for the specified mapping channel

See also:: GenFace

Parameters:

channel	- The index of the map channel
index	- The index of the texture face

CoreExport void SetMapFace	(	int	channel,
		int	index,
		GenFace &	face
	)

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Remarks:: Sets an individual texture mapping face for the specified mapping channel

See also:: Class GenFace

Parameters:

channel	- The index of the map channel
index	- The index of the texture face
face	- The data for the face

CoreExport MtlID GetMtlID ( int index )

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Remarks:: Returns the zero based material ID for the specified face

Parameters:

index - The index of the face

CoreExport void SetMtlID	(	int	index,
		MtlID	mtlID
	)

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Remarks:: Sets the material ID for the specified face

Parameters:

index	- The index of the face
mtlID	- The zero based material ID

CoreExport DWORD GetSmoothingGroup ( int index )

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Remarks:: Returns the smoothing group bits for the specified face

Parameters:

index - The index of the face

CoreExport void SetSmoothingGroup	(	int	index,
		DWORD	smGrp
	)

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Remarks:: Sets the smoothing group bits for the specified face

Parameters:

index	- The index of the face
smGrp	- The smoothing group bits

CoreExport int GetSelLevel ( )

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Remarks:: Returns the current level of selection for the object. See the selection enum values above

CoreExport void SetSelLevel ( int selLevel )

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Remarks:: Sets the current level of selection for the object.

Parameters:

selLevel - The selection level. See the selection enum values above

CoreExport BitArray& GetVertSel ( )

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Remarks:: Returns the bits representing the vertex selection status

CoreExport void SetVertSel ( BitArray & )

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Remarks:: Sets the bits representing the vertex selection status

Parameters:

sel	- The selection bits

CoreExport BitArray& GetFaceSel ( )

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Remarks:: Returns the bits representing the face selection status

CoreExport void SetFaceSel ( BitArray & sel )

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Remarks:: Sets the bits representing the face selection status

Parameters:

sel	- The selection bits

CoreExport BitArray& GetElemSel ( )

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Remarks:: Returns the bits representing the element selection status. For all currently supported types, this is identical to the face selection, because the underlying types do not natively support the element selection level.

CoreExport void SetElemSel ( BitArray & sel )

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Remarks:: Sets the bits representing the element selection status. For all currently supported types, this is identical to setting the face selection, because the underlying types do not natively support the element selection level.

Parameters:

sel	- The selection bits

CoreExport BitArray* GetSel ( int selLevel )

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Remarks:: Returns the bits representing the specified selection status

Parameters:

selLevel - The selection level. See the selection enum values above

CoreExport void SetSel	(	int	selLevel,
		BitArray &	sel
	)

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Remarks:: Returns the bits representing the specified selection status

Parameters:

selLevel	- The selection level. See the selection enum values above
sel	- The selection bits

CoreExport void FaceToElemSel	(	BitArray &	elemSel,
		BitArray &	faceSel
	)

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Converts the bits representing a face selection into bits representing an element selection, and expands the selection accordingly.

If any face in an element is selected according the input bits, then all faces within that element will be toggled as selected in the output bits. This method does not change the selection on the object; the methods SetFaceSel() or SetElemSel() are needed to apply a selection after it is calculated

Parameters:

[out]	elemSel	- The output selection bits for the element level
	faceSel	- The input selection bits for the face level

CoreExport void GrowSelection	(	int	selLevel,
		BitArray &	newSel
	)

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Remarks:: Grows the selection for the specified level. The perimeter of the selection is expanded by one sub object. The resulting selection is stored in the output bits; This method does not change the selection on the object

Parameters:

	selLevel	- The selection level. See the selection enum values above
[out]	newSel	- The output selection bits

CoreExport void ShrinkSelection	(	int	selLevel,
		BitArray &	newSel
	)

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Remarks:: Shrinks the selection for the specified level. The perimeter of the selection is reduced by one sub object. The resulting selection is stored in the output bits; This method does not change the selection on the object

Parameters:

	selLevel	- The selection level. See the selection enum values above
[out]	newSel	- The output selection bits

CoreExport void GetSoftSel ( GenSoftSelData & softSelData )

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Remarks:: Returns the soft selection parameters

See also:: GenSoftSelData

Parameters:

[out] softSelData - The selection parameters

CoreExport void SetSoftSel ( GenSoftSelData & softSelData )

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Remarks:: Sets the soft selection parameters. Note that UpdateSoftSel() may be needed to recalculate the soft selection weights.

See also:: GenSoftSelData

Parameters:

softSelData - The selection parameters

CoreExport void UpdateSoftSel ( )

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Remarks:: Recalculates the soft selection weights. Use this after setting the soft selection parameters.

CoreExport float* SoftSelWeights ( )

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Remarks:: Returns the vertex soft selection weights. If cached, the cache is returned. Otherwise a cache is allocated and computed from the current object and the soft selection parameters.

CoreExport Point3 SoftSelColor ( float f )

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Remarks:: Returns the viewport display color corresponding to the given vertex soft selection weight.

Parameters:

f	- The selection weight, ranging from 0 to 1

CoreExport BOOL SubObjectHitTest	(	int	selLevel,
		GraphicsWindow *	gw,
		Material *	ma,
		HitRegion *	hr,
		DWORD	flags,
		HitListWrapper &	hitList,
		int	numMat = `1`,
		Matrix3 *	mat = `NULL`
	)

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Remarks:: Performs a viewport hit testing operation against the object

Parameters:

	gw	- The graphics window associated with the viewport the object is being hit tested in.
	ma	- The list of materials for the mesh
	hr	- This describes the properties of a region used for the hit testing. See Class HitRegion.
	flags	- Flags specifying how the hit testing is performed. Accepted values are SUBHIT_IGNOREBACKFACING to specify the ignore backfacing mode, plus the following values defined in Mesh.h: SUBHIT_UNSELONLY, SUBHIT_ABORTONHIT, SUBHIT_SELSOLID, and SUBHIT_USEFACESEL
[out]	hitList	- The hit list object to hold the results of the hit test operation. See Class HitListWrapper.
	numMat	- The number of materials for the mesh.
	mat	- The object-to-world transform matrix for the object. This needed to calculate backface culling if the underlying object is type Mesh and the flag ObejctWrapper:: SUBHIT_IGNOREBACKFACING is specified return TRUE if any hits were found, FALSE otherwise

CoreExport int IntersectRay	(	Ray &	ray,
		float &	intersectAt,
		Point3 &	norm,
		int &	fi,
		FloatTab &	bary
	)

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Remarks:: Intersects a ray against the object, returning the face and barycentric coordinates of the hit point.

Parameters:

	ray	- The ray to cast
[out]	intersectAt	- The distance travelled by the ray to the intersection point.
[out]	norm	- The surface normal at the intersection point.
[out]	fi	- The face index of the intersected face
[out]	bary	- The barycentric coordinates of the hit point. For MNMesh and PatchMesh object, there may be more than three coordinate values return Nonzero if an intersection was found, zero otherwise

CoreExport void Render	(	GraphicsWindow *	gw,
		Material *	ma,
		RECT *	rp,
		int	compFlags,
		int	numMat = `1`
	)

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Remarks:: Renders the object using the specified graphics window and array of materials.

Parameters:

gw	- Points to the graphics window to render to.
ma	- The list of materials to use to render the mesh.
rp	- Specifies the rectangular region to render. If the mesh should be rendered to the entire viewport pass NULL
compFlags	- One or more of the following flags defined in Mesh.h: COMP_TRANSFORM, COMP_IGN_RECT, COMP_LIGHTING, COMP_ALL or COMP_OBJSELECTED
numMat	- The number of materials for the mesh

CoreExport int SelLevel ( int selLevel )

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Remarks:: Converts the ObjectWrapper selection level enum values into the type-specific equivalents. For instance, an input of ObjectWrapper::SEL_VERT (integer value 1) would return MESH_VERTEX (integer value 2) if the underlying object was type Mesh.

CoreExport int HitLevel ( int selLevel )

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Remarks:: Converts the ObjectWrapper hit level enum values into the type-specific equivalents. For instance, an input of ObjectWrapper::SEL_VERT (integer value 1) would return SUBHIT_VERTS (integer value 1<< 25) if the underlying object was type Mesh.