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Campbell Barton 09e11ad6ef modifier stack: lazy initialize normals ...

many modifiers were calculating normals, when those normals were ignored by the next modifier.
now flag normals as dirty and recalculate for modifiers that set use `dependsOnNormals()` callback.

Quick test on mesh with 12 modifiers (mostly build type), calculated normals 6 times, now it only runs once - so this will give some speedup too.

2013-05-30 17:36:43 +00:00

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