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Question by liubara · Dec 01, 2018 at 03:23 AM · shadersshader programmingshaderlabshader writingproblema

Anisotropic Shader, How Does It Works? Help

It would be very helpful if someone explained to me what this line does to create the anisotropic or ring/follow surface direction reflection of an anisotropic reflection, or the explanation of anisotropic reflection in general, thank you.

{

             fixed3 h = normalize(normalize(lightDir) + normalize(viewDir));
             float NdotL = saturate(dot(s.Normal, lightDir));

             fixed HdotA = dot(normalize(s.Normal + s.AnisoDir.rgb), h);
             float aniso = max(0, sin(radians((HdotA + _AnisoOffset) * 180)));   // THIS LINE

             float spec = saturate(dot(s.Normal, h));
             spec = saturate(pow(lerp(spec, aniso, s.AnisoDir.a), s.Gloss * 128) * s.Specular);

             fixed4 c;
             c.rgb = ((s.Albedo * _LightColor0.rgb * NdotL) + (_LightColor0.rgb * spec)) * (atten * 2);
             c.a = 1;
             clip(s.Alpha - _Cutoff);
             return c;
          }

This is a code taken from unity's documentation.

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