View-MatCap

View-Matcap shader

Godot 4

The matcap texture is applied from the surface normals in the view-space (the texture follows the camera).  It can be used to fake complex materials with reflections and lighting for mobile devices. Matcaps are typically used in software like Blender and Zbrush.

Shader code

/*
	MatCap Shader by Firerabbit
	
	MIT License
*/

shader_type spatial;

uniform sampler2D matcap : source_color, hint_default_black;
uniform float metalness : hint_range(0.0,1.0) = 1.0;
uniform vec4 color : source_color = vec4(1.0);

void fragment() {
	vec2 matcap_uv = (NORMAL.xy * vec2(0.5, -0.5) + vec2(0.5, 0.5));
	ALBEDO = color.rgb;
	ALBEDO *= mix(vec3(1.0), texture(matcap, matcap_uv).rgb, metalness);
}

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