Moon Phase

Show a pseudo-moon and progress it through its phases. You need to use material.set_shader_parameter("cval", cval) in your Godot code with something like process’s delta.

Shader code

shader_type canvas_item;

uniform float cval = 0.0;
uniform vec4 shade = vec4(0, 0, 0, 255);
uniform float shade_radius = 0.5;

void fragment() {
	vec2 center = vec2(cval, 0.5);
	
	COLOR.a = 0.0;

	float dist = distance(UV, vec2(0.5, 0.5));
	if(dist < shade_radius) {
		COLOR = vec4(255, 255, 255, 255);
	}

	dist = distance(UV, center);
	if(dist < shade_radius) {
		COLOR = shade * COLOR.a;
	}
}

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