varying vec4 Ca;
varying vec4 Cd;
varying vec4 Cs;

varying vec4 V_eye;
varying vec4 L_eye;
varying vec4 N_eye;

void main(void)
{
  vec3 L = normalize(vec3(L_eye));
  vec3 N = normalize(vec3(N_eye));

  float diffuse = clamp(dot(L, N), 0.0, 1.0);

  gl_FragColor = Ca + (Cd*diffuse);
}

