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由 alteredq 提交于
Added alphaTest parameter to base Material plus corresponding shader chunk in standard materials implementation. This is for having on/off transparency without sorting using threshold value in alpha channel of diffuse texture. By default it's switched off (alphaTest = 0). AlphaTest is not yet handled in shadow maps. This would require passing of diffuse texture to depth material in shadow map render step (and more permutations of depth material).
dc042582