vec3 gl330_normalize(vec3 at)
{
  float dist = sqrt(pow(at.x, 2) +  pow(at.y, 2) +  pow(at.z, 2));
  at.x /= dist;
  at.y /= dist;
  at.z /= dist;
  return at;
}


void main()
{
  vec4 result = sky_projection * vec4(in_xyz, 1.0);
  result.x /= result.w;
  result.y /= result.w;
  result.z /= result.w;

  result.xyz = gl330_normalize(result.xyz);

  color = vec4(0,1,0,1);
  color = vec4(1.0,0.0,0.0,1.0);
  color.y = result.y/2+0.5;
  //  color.xyz = result.xyz/2 + 0.5;// sky(result.xyz);

  //gl_FragDepth = 1.0;