Ogre::IrradianceFieldRaster Class Reference

Implements IrradianceField, but generating results via cubemap rasterization. More...

#include <OgreIrradianceFieldRaster.h>

Inheritance diagram for Ogre::IrradianceFieldRaster:

Public Member Functions
	IrradianceFieldRaster (IrradianceField *creator)
virtual	~IrradianceFieldRaster ()
void	createWorkspace ()
void	destroyWorkspace ()
void	renderProbes (uint32 probesPerFrame)

Detailed Description

Implements IrradianceField, but generating results via cubemap rasterization.

GPUs are normally slow for rasterization at row resolution thus not well suited (hence raytracing or voxelization are better suited) but currently voxelization either requires a lot of memory or a slow pre-build process, hence a raster-based approach is less invasive and in many cases more practical.

Remarks

Q: Why can't we reuse the cubemaps from PCC? (Parallax Corrected Cubemaps)

A: Because:

1. We require to convert the depth buffer of each side into a cubemap.
   We could reuse the depth compression though. It's not accurate information
   but it may be good enough
2. Resolution needs to be low (e.g. 16x16 or so). Workaroundeable if
   we sample higher mips.
3. PCC provides no guarantees the cubemaps are aligned in a perfect 3D grid.
   PccPerPixelGridPlacement generates the cubemaps in a grid alignment, but
   the camera are not guaranteed to be at the center of each probe

In short, it may be possible, but there are several issues to workaround, hence it is just easier to render the information we need

Constructor & Destructor Documentation

IrradianceFieldRaster()

Ogre::IrradianceFieldRaster::IrradianceFieldRaster

(

IrradianceField *

creator

)

~IrradianceFieldRaster()

virtual Ogre::IrradianceFieldRaster::~IrradianceFieldRaster ( )

virtual

Member Function Documentation

createWorkspace()

void Ogre::IrradianceFieldRaster::createWorkspace

(

)

destroyWorkspace()

void Ogre::IrradianceFieldRaster::destroyWorkspace

(

)

renderProbes()

void Ogre::IrradianceFieldRaster::renderProbes

(

uint32

probesPerFrame

)

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

• OgreIrradianceFieldRaster.h