import flat_effect;
import _sky;

#pragma MSP stage(fragment)
layout(location=0) out vec3 frag_color;
void main()
{
	float height = texcoord.x*texcoord.x*atmosphere_thickness;
	float z = texcoord.y;
	float r = sqrt(1.0-z*z);
	vec3 look_dir = vec3(r, 0.0, z);
	frag_color = exp(-raymarch_path(height, look_dir).optical_depth);
}