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Multitexture Soft Reflections on
Radeon®
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Figure 1 - Gloss mapped multitextured
soft reflections
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The sample RadeonSoftReflect implements an accumulation
buffer technique for simulating soft reflections by using
multitexturing, render target textures, and vertex fog.
This is based on a Multi-pass Pipeline Rendering (MPR)
technique proposed by Paul J. Diefenbach and Norman I.
Badler in "Multi-Pass Pipeline Rendering: Realism For
Dynamic Environments". To download this paper, and for
more on his work on MPR, visit Paul
Diefenbach's home page.
The soft reflection effect is simulated by stochasitcally
shearing X, Y about the normal axis to the reflecting
surface for multiple samples of the reflected geomtery.
The samples are accumulated to generate the final reflection
scatter effect. The shearing is performed by transforming
world coordinates into the plane normal view at the reflection
surface, shearing linearly with respect to the perpendicular
distance from the surface, and transforming back into
world space. Reflections are faded by applying a dark
shade of vertex fog that varies linearly with the perpendicular
distance from the reflection surface.
Each stochastic sample is rendered into an independent
render target texture. The samples are accumulated by
adding them in weighted proportions through a combination
of multitexturing and alpha blending. The Radeon® can
combine four samples in a single pass using its three
texture stage units and the alpha blending unit. This
process can be used recursively to accumulate more samples.
The final scattered image is projected onto the reflecting
surface using a texture transformation matrix. Figure
1 shows this effect.
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- RadeonSoftReflect Controls
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- S - Toggle between regular and larger shear
displacement
- M - Toggle between default (6) and more (12)
samples
- J - Enable/Disable random jitter added to the
shear displacement
- G - Toggle gloss mapping on/off
- [SPACE] - Advance Frame-by-frame
- [ENTER] - stop advancing Frame-by-frame
- [LEFT] - Rotate camera left
- [RIGHT] - Rotate camera right
- [ESC] - Quit
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Downloads
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Note: The source code and media should be unzipped
into the following recommended directory structure to
ensure you can easily compile and run the executable.
Radeonxxxxxx.zip -> x:\atiddk\Direct3D\Radeonxxxxxx
media.zip -> x:\atiddk\media
RadeonSoftReflect.zip
media.zip
Back
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