I am trying to implement the Cook-Torrance model, and this is how I calculate the parameter Rs:
float Rs(float m,float F,vec3 N, vec3 L,vec3 V, vec3 H) { float result; float NdotV= dot(N,V); float NdotH= dot(N,H); float NdotL= dot(N,L); float VdotH= dot(V,H); float Geom= min(min(1.0, (2.0*NdotV*NdotH)/VdotH), (2.0*NdotL*NdotH)/VdotH); float Rough= pow(1.0/(pow(m,2.0)*pow(NdotH,4.0)), ( pow(NdotH,2.0)-1.0)/( pow(m,2.0)*pow(NdotH,2.0))); float Fresnel= F + pow(1.0-VdotH,5.0) * (1.0-F); return (Fresnel * Rough * Geom)/(NdotV*NdotL); } I apply this formula:
Where I set m to 0.5 and F0 to 2.0.
But I think it's wrong because I'm getting a black area where there should be the specular light:
PS: With OpenGL 2.1, GLSL 1.20.
