Vertex Shader: How to recalculate surface normals for correct light mapping??

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+2 votes

Hi. Does anyone know how to recalculate normals in vertex shader using central differences, as explained here but with a noise that is an image (not generated in shader code)?

I have a grid mesh with a vertex shader for terrain displacement but the shadows are all wrong because the base mesh's normals are all pointing up. I need the normals recalculated. Please help...

Godot version 4.0
in Engine by (516 points)

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