Specify which vertex normals to update

If i have an indexed buffer geometry is it possible to pass in the vertex index to computeVertexNormals() so as to only update the vertices that have changed? Currently with large geometries this operation cause a lag.

No sorry. The method has no parameters and thus computes all vertex normals for the geometry. You need a custom solution for your use case.

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Is there any reason not currently implemented?

Your use case is very specific and we do not want to over-engineer methods.

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sounds fair… Seems like updating geometries would be common… thanks for the help