The simplest outline shader (improved)

Inspired by RPaciorek‘s outline shader.

The original moves all vertices outward from the origin – which means it won’t work (as intended) on any concave shapes. Here, we instead move outward using the NORMAL, to fix that.

Attach the shader material as a next pass.

Shader code

shader_type spatial;
render_mode cull_front, unshaded;

uniform vec3 color : source_color = vec3(0,0,0);
uniform float thickness : hint_range(0.0, 1.0, 0.01) = 0.05;

void vertex() {
	VERTEX += thickness*NORMAL;
}

void fragment() {
	ALBEDO = color;
}

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