Applying StandardMaterial3D After Vertex Displacement Shader

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1

Godot Version

4.5.1

Question

I have a simple shader that displaces a plane mesh’s vertices based on a heightmap:

shader_type spatial;

uniform sampler2D heightmap;
uniform float max_height;

void vertex() {
	VERTEX.y += texture(heightmap, UV).r * max_height;
}

I would like to be able to render a StandardMaterial3D on top of a ShaderMaterial I have set to a MeshInstance3D’s material_override. I tried using the ShaderMaterial’s next_pass, but I get this result:

image
image2177×1080 349 KB

The entire mesh should appear pink, but displaced faces are still white/unaffected by the StandardMaterial3D.

How can I use a ShaderMaterial to displace a mesh’s vertices then use a StandardMaterial3D to color/shade the mesh?

2

Put it all in a single shader material.
Setup your standard material in material_override, convert it to shader material and then paste the displacement code into shader’s vertex() function.

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