MRenderShadowData Class Reference

Access Rendering Shadow Map Data. More...

#include <MRenderShadowData.h>

Public Types
enum	LightType { kInvalid, kPoint, kDirectional, kSpot }
	Light Types. More...

Public Member Functions
	MRenderShadowData ()
	Default Constructor.
void	worldToZbuffer (const MFloatPoint &worldPoint, MFloatPoint &screenPoint) const
	Converts world space point to shadow map. More...
void	zbufferToWorld (const MFloatPoint &screenPoint, MFloatPoint &worldPoint) const
	Converts shadow map point to world space. More...

Public Attributes
bool	perspective
	set if the light has a perspective projection
bool	useMidDistMap
	set if the light generates a depth and midDist map
LightType	lightType
	the type of light the shadow map is generated for
unsigned short	shadowResX
	the x resolution of shadow map
unsigned short	shadowResY
	the y resolution of the shadow map
MFloatPoint	lightPosition
	position of the light in world space
MFloatMatrix	projectionMatrix
	projection matrix for the light
MFloatMatrix	perspectiveMatrix
	perspective matrix for the light
float *	depthMaps
	the output depth map
float *	midDistMaps
	the output mid distance map

Detailed Description

Access Rendering Shadow Map Data.

The shadow map can be changed by instanciating a MRenderCallback and overriding shadowCastCallback(). When this is invoked, a MRenderShadowData is passed as an argument; the depthMaps and midDistMaps members can then be changed by this API. Methods and data are provided to assist in transforming back and forth from world space to z buffer space. Paint Effects and Fur are two examples which use this mechanism to change the shadow map.

To prevent self shadowing, Maya uses a mid distance map to resolve the ambiguity. Details of this technique can be obtained from Graphics Gems III, "The Shadow Depth Map Revisited".

Examples:

renderAccessNode/renderAccessNode.cpp.

Member Enumeration Documentation

enum LightType

Light Types.

Enumerator
kInvalid
kPoint
kDirectional
kSpot

Member Function Documentation

void worldToZbuffer	(	const MFloatPoint &	inPoint,
		MFloatPoint &	outPoint
	)		const

Converts world space point to shadow map.

Shadow depth is stored in inPoint.z

Parameters

[in]	inPoint	The original point in world space
[out]	outPoint	The converted point in shadow map

Examples:

renderAccessNode/renderAccessNode.cpp.

void zbufferToWorld	(	const MFloatPoint &	inPoint,
		MFloatPoint &	outPoint
	)		const

Converts shadow map point to world space.

Shadow depth is stored in inPoint.z.

Parameters

[in]	inPoint	The original point in shadow map
[out]	outPoint	The converted point in world space

Examples:

renderAccessNode/renderAccessNode.cpp.

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The documentation for this class was generated from the following files:

• MRenderShadowData.h
• MRenderShadowData.cpp