Fixing Normals for Heightmap Terrain in Godot 4 - the Easy Way

Follow-up to the 'wandering' terrain video. Quick and easy way to recalculate normals for a heightmap terrain make with vertex shader displacement. This one relies on normal maps either made in Godot (via 'As Normal Map' setting on a procedural noise texture) or imported from a 3rd party terrain generator. Special thanks to @wojtek_pe and @williamgodwin5582 for putting up with my moaning on twitter. Btw, follow me on twitter (devmar).