lygia/v1.2.0/lighting/ior/2f0)index of refraction to reflectance at 0 degree https://handlespixels.wordpress.com/tag/f0-reflectance/
Dependencies:
Use:
<float|vec3|vec4> ior2f0(<float|vec3|vec4> ior)
#ifndef FNC_IOR2F0
#define FNC_IOR2F0
float ior2f0(const in float ior) { return pow2(ior - 1.0) / pow2(ior + 1.0); }
vec3 ior2f0(const in vec3 ior) { return pow2(ior - 1.0) / pow2(ior + 1.0); }
vec4 ior2f0(const in vec4 ior) { return vec4(pow2(ior.rgb - 1.0) / pow2(ior.rgb + 1.0), ior.a); }
#endif
Dependencies:
Use:
<float|float3|float4> ior2f0(<float|float3|float4> ior)
#ifndef FNC_IOR2F0
#define FNC_IOR2F0
float ior2f0(const float ior) { return pow2(ior - 1.0) / pow2(ior + 1.0); }
float3 ior2f0(const float3 ior) { return pow2(ior - 1.0) / pow2(ior + 1.0); }
float4 ior2f0(const float4 ior) { return float4(pow2(ior.rgb - 1.0) / pow2(ior.rgb + 1.0), ior.a); }
#endif
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