Alexander Gavrilov
460d1a4cb3
A Bump node without a Height input is meaningless and does nothing. As such, it is available as an old workaround that allows making Node Group inputs that default to normal when not connected, by routing via a no-op Bump node before doing math. Cycles specifically recognizes this use case and either bypasses the node, or converts it into a Geometry Normal node, but Eevee was still evaluating it as usual. That incurred performance cost, and also normalized the vector unlike Cycles. This implements the same bypass logic for Eevee. Since I'm not sure if it's possible to totally remove the node at this stage, it emits a no-op function call to copy the input vector. Differential Revision: https://developer.blender.org/D14045