Need help with Shader Script and Material Override

Help Shaders
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1

Godot Version

Godot Engine v4.5.stable.official.876b29033

Question

Currently working on a RTS type game
I’m trying to find the “best” way to overide a building material, so that if the “building placement” is valid, make the material green and if not, make it red.
Upon placing the building, the material is no longer overridden.

I have a basic shader applied by default

image
image308×474 22.5 KB

And I’m aware that there is a “Shader script” that is suppose to interact with it.

shader_type spatial;
render_mode blend_mix,diffuse_toon,shadows_disabled,specular_disabled,ambient_light_disabled

instance uniform vec4 instance_color_01 : source_color;

void fragment() {
		ALBEDO = instance_color_01.rgb;
		ALPHA = instance_color_01.a;
}

my current problem, is I don’t understand where am I suppose to plug the “shader script”
I would assume that I need to pulg it into the “Material Override” (as in drag and drop the script), but it doesn’t seem to do anything.

image
image303×843 41.2 KB

I feel like there is a much easier/efficient way of doing what I need. Which is changing an asset’s material between 3 (Valid>Green / Invalid>Red / Placed>AssignedMaterial).

3

You need to attach a gdscript to the node that is responsible for the meshinstances.
If you scroll to the top on the meshinstance you could also make it unique then click the image, you should see the meshinstance settings (not the material override) and then you can assign or create a material in there.

You should then be able to duplicate the node.

4

You might want to use material_overlay instead.