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Function for calculate fresnel terms modified original lazanyi apprx
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| float Pow5(float x) { return x*x*x*x*x; } | |
| float Pow6(float x) { return x*x*x*x*x*x; } | |
| //Ref: https://diglib.eg.org/bitstream/handle/10.2312/mam20191305/007-011.pdf Eq(2;4) | |
| float3 fresnel_lazanyi_2019(float cos_theta, float3 f0, float3 f82) | |
| { | |
| float3 a = 17.6513846 * (f0 - f82) + 8.16666667 * (1.0 - f0); | |
| float m = Pow5(1.0 - cos_theta); | |
| return clamp((f0 + (1.0 - f0) * m - a * cos_theta * (m - m * cos_theta)), 0, 1); | |
| } | |
| float fresnel_lazanyi_2019(float cos_theta, float f0, float f82) | |
| { | |
| float a = 17.6513846f * (f0 - f82) + 8.16666667f * (1.0 - f0); | |
| float m = Pow5(1.0 - cos_theta); | |
| return clamp((f0 + (1.0 - f0) * m - a * cos_theta * (m - m * cos_theta)), 0, 1); | |
| } |
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