Improvements to parallax mapping code for comprehensibility and correctness#1
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nicopap merged 2 commits intonicopap:pbr-parallax-mappingfrom Apr 10, 2023
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superdump
commented
Apr 10, 2023
- 'height' -> 'depth' as the texture has 0 as minimum depth and 1 as maximum depth.
- Make the Vt used in parallax mapping point from the camera to the fragment to make the algorithm easier to understand as the ray points into the surface. Adjust the UV maths as appropriate to step forward instead of backward.
- Parallax depth -> parallax depth scale to make it clearer that this scales the parallax depth effect.
…ctness 'height' -> 'depth' as the texture has 0 as minimum depth and 1 as maximum depth. Make the Vt used in parallax mapping point from the camera to the fragment to make the algorithm easier to understand as the ray points into the surface. Adjust the UV maths as appropriate to step forward instead of backward.
nicopap
reviewed
Apr 10, 2023
| let layer_height = 1.0 / layer_count; | ||
| var delta_uv = depth * V.xy / V.z / layer_count; | ||
| let layer_depth = 1.0 / layer_count; | ||
| var delta_uv = depth_scale * layer_depth * Vt.xy * vec2(1.0, -1.0) / view_steepness; |
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Multiplying this by vec2(1.0, -1.0) is very surprising. I understand it's to avoid the -B, but in this case I think it should be explained. I know it's necessary, but I don't understand why.
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