shield.shader

shader_type spatial;

uniform vec3 target = vec3(1.0, 0.0, 0.0);
uniform float alpha = 1.0;
uniform vec4 globe_color : hint_color = vec4(0.1, 0.5, 0.99, 0.5);
uniform vec4 shield_color : hint_color = vec4(0.99, 0.0, 0.1, 1.0);

varying float ang;

void vertex() {
	vec3 v = vec3(VERTEX.xy, VERTEX.z);
	ang = dot(normalize(target), normalize(v));
}

void fragment() {
	float lim = 0.9 + 0.099 * alpha * abs(sin(TIME * 40.0));
	if (ang > lim) {
		ALBEDO = shield_color.rgb;
		ALPHA = alpha;
		EMISSION = shield_color.rgb * lim;
	} else {
		ALBEDO = globe_color.rgb;
		EMISSION = globe_color.rgb;
		ALPHA = alpha * globe_color.a;
	}
}