#version 330

in vec4 cam_pos;
in vec3 model_norm;
in vec3 world_norm;
in vec3 cam_norm;

out vec4 o_color;

void main() {
  float incidence_level = clamp(dot(normalize(- cam_pos.xyz), normalize(cam_norm)), 0.0, 1.0);
  // vec3 modifier = sin(normalize(cam_pos) * 20.0);
  // vec3 modifier = sin(normalize(cam_pos.xyz * cam_norm) * 200.0) * cos(cam_pos.xyz);
  vec3 modifier = sin(incidence_level * 40) * cam_pos.xxx * cos(cam_norm * 2.0);
  float grey_level = clamp(incidence_level, 0.0, 1.0) * 0.15;
  vec3 green = vec3(62.0 / 255.0, 117.0 / 255.0, 31.0 / 255.0);
  o_color = vec4(green * incidence_level * 0.4, 1.0);
  // o_color = cam_pos;
  // o_color = vec4(model_norm, 1.0);
  // o_color = vec4(normalize(world_norm), 1.0);
  // o_color = vec4(normalize(cam_norm), 1.0);
  // o_color = vec4(grey_level, grey_level, grey_level, 1.0);
  // o_color = 0.5 * vec4(grey_level, grey_level, grey_level, 1.0) + vec4(modifier, 1.0);
}