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Using the stencil buffer on the ATI
Rage128 with Direct3D
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The R128Reflect sample program shows a simple use for the stencil buffer: providing a protected area on the render target outside which no rendering will take place. This helps to show the emulation of a reflective surface, where the reflections are not to be visible outside the area of the surface. Figure 1 shows R128Reflect in action.
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Figure 1
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- R128Reflect works as follows:
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- Draw every original object other than the reflective surface normally.
- Put the shape of the reflective surface into the stencil buffer, but not on to the z-buffer or draw buffer.
- Reflect all the original objects in the plane of the reflective surface, and draw them wherever the stencil buffer is non-zero.
- Alpha-blend the reflective surface additively on to the draw buffer.
- R128Reflect Controls
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- F1 - Help
- F2 - Select Driver/Device/Mode
- [ALT]+[ENTER] - Toggle fullscreen/windowed
- Up/Down Arrows - Move camera up/down
- Left/Right Arrows - Rotate scene left/right
- F3 - Toggle use of stencil
- [ESC] - Quit
Downloads
DirectX 6 project file, source, executable, and support files
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