class MRenderShadowData

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public members:

	MRenderShadowData ()
void	worldToZbuffer ( const MFloatPoint & worldPoint, MFloatPoint & screenPoint) const
void	zbufferToWorld ( const MFloatPoint & screenPoint, MFloatPoint & worldPoint) const
bool	perspective set if the light has a perspective projection
bool	useMidDistMap set if the light generates a depth and midDist map
enum	LightType Light Types kInvalid kPoint kDirectional kSpot
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

Documentation

Description

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".

Functions

MRenderShadowData:: MRenderShadowData ()

Description

Default Constructor

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

Description

Converts world space point to shadow map. Shadow depth is stored in inPoint.z.

Arguments

• inPoint The original point in world space
• outoint The converted point in shadow map

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

Description

Converts shadow map point to world space. Shadow depth is stored in inPoint.z.

Arguments

• inPoint The original point in shadow map
• outoint The converted point in world space

This class has no child classes.