Voxel edges should store material types

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This has useful relevant stuff.

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Procworld points out that whether or not we want to blend materials in transition areas depends on which materials they are.

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It might be better to say that there is no blending between materials, but that they store extra attributes. E.g. instead of grass, dirt, snow, and stone materials, there would be a single terrain material that has extra data determining how much of each of these things it has.

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There's also the more general approach of allowing multiple independent material layers on any edge. The time/space requirements might not work out though.

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