shader_type spatial;
render_mode cull_disabled;

instance uniform vec4 color: source_color = vec4(0.2, 0.4, 0.5, 0.75);
instance uniform float frequency = 1.0;
instance uniform float wavelength = 1.0;
instance uniform float amplitude = 1.0;

varying float displacement;

vec3 project(vec3 a, vec3 b) {
	float m = length(b);
	return dot(a, b)*b/(m*m);
}

void vertex() {
	displacement = (
		sin((frequency*TIME + VERTEX.x/wavelength)*TAU) +
		cos((frequency*TIME + VERTEX.z/wavelength)*TAU)
	)/2.0;
	VERTEX.y += displacement*amplitude;
}

void fragment() {
	float df = (1.0 - displacement)/2.0;
	ALBEDO = color.rgb;
	ALPHA = color.a;
	CLEARCOAT = df;
	CLEARCOAT_ROUGHNESS = df;
	ROUGHNESS = df;
	RIM = df;
	RIM_TINT = df;
	METALLIC = df;
	SPECULAR = 1.0;
}