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#version 330 core
uniform vec3 sky_color;
uniform vec3 sun_direction;
in vec3 surface_normal;
in float depth;
out vec4 color;
void main() {
float brightness = dot(normalize(surface_normal), normalize(-sun_direction));
vec3 diffuse = vec3(1 - clamp(brightness, -0.3, 0.2));
vec3 base = vec3(1.0, 1.0, 1.0) * diffuse;
color = vec4(mix(sky_color, base, 1 - depth), 0.3);
}
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