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#ifndef DEFAULT_MATERIAL_FRESNEL_GLSLLIB
#define DEFAULT_MATERIAL_FRESNEL_GLSLLIB
float defaultMaterialSimpleFresnel( in vec3 N, in vec3 viewDir, in float ior, float fresnelPower )
{
float F = ((1.0-ior) * (1.0-ior)) / ((1.0+ior) * (1.0+ior));
float VdotN = dot(viewDir, N);
float dvn = abs( dFdx(VdotN) * dFdy(VdotN) );
VdotN = clamp( VdotN, 0.0, 1.0 );
float ratio = F + (1.0 - F) * pow(1.0 - VdotN, fresnelPower);
return clamp( ratio * pow( VdotN, dvn * fresnelPower ), 0.0, 1.0 );
}
#endif
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