vtkShadowMapPass Class Reference

#include <vtkShadowMapPass.h>

Inheritance diagram for vtkShadowMapPass:

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Collaboration diagram for vtkShadowMapPass:

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List of all members.

Detailed Description

Implement a shadow mapping render pass.

Render the opaque polygonal geometry of a scene with shadow maps (a technique to render hard shadows in hardware).

This pass expects an initialized depth buffer and color buffer. Initialized buffers means they have been cleared with farest z-value and background color/gradient/transparent color. An opaque pass may have been performed right after the initialization.

Its delegate is usually set to a vtkOpaquePass.

Implementation:: The first pass of the algorithm is to generate a shadow map per light (depth map from the light point of view) by rendering the opaque objects with the OCCLUDER property keys. The second pass is to render the opaque objects with the RECEIVER keys.

See also:: vtkRenderPass, vtkOpaquePass

Tests:: vtkShadowMapPass (Tests)

Definition at line 62 of file vtkShadowMapPass.h.


Public Types
typedef vtkRenderPass	Superclass
Public Member Functions
virtual const char *	GetClassName ()
virtual int	IsA (const char *type)
void	PrintSelf (ostream &os, vtkIndent indent)
virtual void	Render (const vtkRenderState *s)
void	ReleaseGraphicsResources (vtkWindow *w)

virtual vtkRenderPass *	GetOpaquePass ()
virtual void	SetOpaquePass (vtkRenderPass *opaquePass)

virtual void	SetResolution (unsigned int)
virtual unsigned int	GetResolution ()

virtual void	SetPolygonOffsetFactor (float)
virtual float	GetPolygonOffsetFactor ()

virtual void	SetPolygonOffsetUnits (float)
virtual float	GetPolygonOffsetUnits ()
Static Public Member Functions
static vtkShadowMapPass *	New ()
static int	IsTypeOf (const char *type)
static vtkShadowMapPass *	SafeDownCast (vtkObject *o)
static vtkInformationIntegerKey *	OCCLUDER ()
static vtkInformationIntegerKey *	RECEIVER ()
Protected Member Functions
	vtkShadowMapPass ()
virtual	~vtkShadowMapPass ()
void	BuildCameraLight (vtkLight light, vtkCamera camera)
void	BuildSpotLightIntensityMap ()
void	CheckSupport (vtkOpenGLRenderWindow *w)
Protected Attributes
vtkRenderPass *	OpaquePass
unsigned int	Resolution
float	PolygonOffsetFactor
float	PolygonOffsetUnits
vtkFrameBufferObject *	FrameBufferObject
vtkShadowMapPassTextures *	ShadowMaps
vtkShadowMapPassLightCameras *	LightCameras
vtkShaderProgram2 *	Program
vtkTextureObject *	IntensityMap
vtkSampleFunction *	IntensitySource
vtkImageExport *	IntensityExporter
vtkImplicitHalo *	Halo
vtkTimeStamp	LastRenderTime

Member Typedef Documentation

typedef vtkRenderPass vtkShadowMapPass::Superclass

Reimplemented from vtkRenderPass.

Definition at line 66 of file vtkShadowMapPass.h.

Constructor & Destructor Documentation

vtkShadowMapPass::vtkShadowMapPass ( ) [protected]

Default constructor. DelegatetPass is set to NULL.

virtual vtkShadowMapPass::~vtkShadowMapPass ( ) [protected, virtual]

Destructor.

Member Function Documentation

static vtkShadowMapPass* vtkShadowMapPass::New ( ) [static]

Create an object with Debug turned off, modified time initialized to zero, and reference counting on.

Reimplemented from vtkObject.

virtual const char* vtkShadowMapPass::GetClassName ( ) [virtual]

Reimplemented from vtkRenderPass.

static int vtkShadowMapPass::IsTypeOf ( const char * name ) [static]

Return 1 if this class type is the same type of (or a subclass of) the named class. Returns 0 otherwise. This method works in combination with vtkTypeRevisionMacro found in vtkSetGet.h.

Reimplemented from vtkRenderPass.

virtual int vtkShadowMapPass::IsA ( const char * name ) [virtual]

Return 1 if this class is the same type of (or a subclass of) the named class. Returns 0 otherwise. This method works in combination with vtkTypeRevisionMacro found in vtkSetGet.h.

Reimplemented from vtkRenderPass.

static vtkShadowMapPass* vtkShadowMapPass::SafeDownCast ( vtkObject * o ) [static]

Reimplemented from vtkRenderPass.

void vtkShadowMapPass::PrintSelf	(	ostream &	os,
		vtkIndent	indent
	)			`[virtual]`

Methods invoked by print to print information about the object including superclasses. Typically not called by the user (use Print() instead) but used in the hierarchical print process to combine the output of several classes.

Reimplemented from vtkRenderPass.

static vtkInformationIntegerKey* vtkShadowMapPass::OCCLUDER ( ) [static]

If this key exists on the PropertyKeys of a prop, the prop is viewed as a light occluder (ie it casts shadows). This key is not mutually exclusive with the RECEIVER() key.

static vtkInformationIntegerKey* vtkShadowMapPass::RECEIVER ( ) [static]

virtual void vtkShadowMapPass::Render ( const vtkRenderState * s ) [virtual]

Perform rendering according to a render state s.

Precondition:: s_exists: s!=0

Implements vtkRenderPass.

void vtkShadowMapPass::ReleaseGraphicsResources ( vtkWindow * w ) [virtual]

Release graphics resources and ask components to release their own resources.

Precondition:: w_exists: w!=0

Reimplemented from vtkRenderPass.

virtual vtkRenderPass* vtkShadowMapPass::GetOpaquePass ( ) [virtual]

Delegate for rendering the opaque polygonal geometry. If it is NULL, nothing will be rendered and a warning will be emitted. It is usually set to a vtkTranslucentPass. Initial value is a NULL pointer.

virtual void vtkShadowMapPass::SetOpaquePass ( vtkRenderPass * opaquePass ) [virtual]

Delegate for rendering the opaque polygonal geometry. If it is NULL, nothing will be rendered and a warning will be emitted. It is usually set to a vtkTranslucentPass. Initial value is a NULL pointer.

virtual void vtkShadowMapPass::SetResolution ( unsigned int ) [virtual]

Set/Get the number of pixels in each dimension of the shadow maps (shadow maps are square). Initial value is 256. The greater the better. Resolution does not have to be a power-of-two value.

virtual unsigned int vtkShadowMapPass::GetResolution ( ) [virtual]

Set/Get the number of pixels in each dimension of the shadow maps (shadow maps are square). Initial value is 256. The greater the better. Resolution does not have to be a power-of-two value.

virtual void vtkShadowMapPass::SetPolygonOffsetFactor ( float ) [virtual]

Factor used to scale the maximum depth slope of a polygon (definition from OpenGL 2.1 spec section 3.5.5 "Depth Offset" page 112). This is used during the creation the shadow maps (not during mapping of the shadow maps onto the geometry) Play with this value and PolygonOffsetUnits to solve self-shadowing. Valid values can be either positive or negative. Initial value is 1.1f (recommended by the nVidia presentation about Shadow Mapping by Cass Everitt). 3.1f works well with the regression test.

virtual float vtkShadowMapPass::GetPolygonOffsetFactor ( ) [virtual]

Factor used to scale the maximum depth slope of a polygon (definition from OpenGL 2.1 spec section 3.5.5 "Depth Offset" page 112). This is used during the creation the shadow maps (not during mapping of the shadow maps onto the geometry) Play with this value and PolygonOffsetUnits to solve self-shadowing. Valid values can be either positive or negative. Initial value is 1.1f (recommended by the nVidia presentation about Shadow Mapping by Cass Everitt). 3.1f works well with the regression test.

virtual void vtkShadowMapPass::SetPolygonOffsetUnits ( float ) [virtual]

Factor used to scale an implementation dependent constant that relates to the usable resolution of the depth buffer (definition from OpenGL 2.1 spec section 3.5.5 "Depth Offset" page 112). This is used during the creation the shadow maps (not during mapping of the shadow maps onto the geometry) Play with this value and PolygonOffsetFactor to solve self-shadowing. Valid values can be either positive or negative. Initial value is 4.0f (recommended by the nVidia presentation about Shadow Mapping by Cass Everitt). 10.0f works well with the regression test.

virtual float vtkShadowMapPass::GetPolygonOffsetUnits ( ) [virtual]

Factor used to scale an implementation dependent constant that relates to the usable resolution of the depth buffer (definition from OpenGL 2.1 spec section 3.5.5 "Depth Offset" page 112). This is used during the creation the shadow maps (not during mapping of the shadow maps onto the geometry) Play with this value and PolygonOffsetFactor to solve self-shadowing. Valid values can be either positive or negative. Initial value is 4.0f (recommended by the nVidia presentation about Shadow Mapping by Cass Everitt). 10.0f works well with the regression test.