Focus circle / ring

Slap on a quad to display selection of a unit, etc. or simply draw a circle.

Shader code

shader_type spatial;
render_mode unshaded, cull_disabled, depth_draw_opaque;

uniform float size;
uniform float width;
uniform vec4 inner_color: hint_color;
uniform vec4 outer_color: hint_color;

void fragment() {
	ALPHA = 0.0;
	vec2 center = vec2(0.5);
	float d = distance(UV, center);
	float h = size * 0.5;
	float l = h - (width * 0.5);
	if (d <= h && d > l) {
		vec4 color = mix(inner_color, outer_color, smoothstep(l, h, d));
		ALPHA = color.a;
		ALBEDO = color.rgb;
	}
}

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