Circle Area of Effect indicator

This is a small “AOE loading” indicator shader.

It is made for having below a boss, or any 3D mesh dealing AOE damage. Slap it on a plane mesh. Keep the dimensions square but resize the mesh to your liking and add this as a ShaderMaterial.

Parameters:

• `aoe_color`: The color of the effect
• `width`: A value for the width of the external circle in UV coordinates
• `fill_value`: How much of the internal circle is filled, between 0 and 1.

Shader code

shader_type spatial;

uniform vec4 aoe_color : source_color = vec4(1.0, 0.0, 0.0, 0.3);
uniform float width : hint_range(0.001, 0.1, 0.001) = 0.01;
uniform float fill_value : hint_range(0.0, 1.0, 0.1) = 0.5;

void fragment() {
	float d = distance(UV, vec2(0.5));
	ALPHA = 0.0;

	// External circle
	if (d >= 0.5 - 2.0* width && d <= 0.5)
		ALPHA = 1.0 * aoe_color.a;

	// Internal circle
	if (d < fill_value * 0.5)
		ALPHA = 1.0 * aoe_color.a;

	ALBEDO = aoe_color.xyz;
}

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