gltfpack: Use vertex attributes to guide simplification #688
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When -sv command line argument is specified, we will use vertex colors (if present) as part of attribute aware simplification to produce better results. For now the intention is to use a single argument to incorporate multiple different types of attributes with fixed weights, in the future we might expose more detailed control via '-sv?' prefix.
When simplificaiton debugging is enabled we need to try to maintain coherence between debug and render simplification options so that the kind/loops overlaid geometry makes sense.
When -sv is specified we now use vertex normals if necessary; this improves quality on meshes that don't have colors, although ideally we should give both to the simplifier.
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This PR currently uses either color or normal; implementing support for both will require copying attribute data out of source buffers, but is likely valuable - need to do more tests. Normal effect, before / after:
Color effect, before / after (this model doesn't use textures):
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Left to right: only using normals, only using colors, using normals+colors (equal weight)
The last one is still not ideal but that's probably because the underlying attribute math needs improvements. But incorporating normals is a clear win over just colors on this model. |
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I think I'm going to merge this as is for now and explore multi stream version separately, as it might also be valuable to do some preprocessing on data (eg linear->sRGB transform for colors for perceptual improvements or some such). |
When -sv command line argument is specified, we will use vertex colors
or vertex normals as part of attribute aware simplification to produce better
results. For now the intention is to use a single argument to
incorporate multiple different types of attributes with fixed weights,
in the future we might expose more detailed control via '-sv?' prefix.
Fixes #652