Advanced Spherical environment metal Shader for mobile.

u Advanced Spherical environment metal Shader for mobile.

l  Unity3D reflection (used ‘CubeMap’) shader is very expensive.

l  Unity3D these not has advanced metal shader.

l  We choose a “Cook Torrance” lighting model.

Technical Directing by JP.Lee with Authored by KT.Kim

shader "CodexShader/Metal/Cook-Torrance" { properties { _Color ("Main Color", Color) = (1,1,1,1) _SpecularColor ("Specular Color", Color) = (1,1,1,1) _MainTex ("Base (RGB) Specular Mask (A)", 2D) = "white" {} _BumpMap ("Normalmap", 2D) = "bump" {} _ReflectionTex ("Reflection Tex", 2D) = "white" {} _ReflectionMask ("Reflection Mask", 2D) = "white" {} _Fo("F0",range(0,1))=0.3 _Dm("Dm",range(0,1))=0.3 _DiffAmount("DiffAmount" , range (1,3)) = 1.5 } subshader { Tags{ "rendertype"="opaque" } LOD 200 CGPROGRAM #pragma surface surf Cook_Torrance vertex:vert #pragma target 3.0 #include "UnityCG.cginc" uniform sampler2D _MainTex; uniform sampler2D _BumpMap; uniform sampler2D _ReflectionTex; uniform sampler2D _ReflectionMask; uniform fixed4 _Color; uniform fixed4 _SpecularColor; uniform fixed _Fo; uniform fixed _Dm; uniform fixed _DiffAmount; struct SurfaceOutputRefl { fixed3 Albedo; fixed3 ReflAlbedo; fixed3 Normal; fixed3 Emission; fixed Specular; fixed Alpha; fixed MaskAlpha; fixed ReflMaskAlpha; }; fixed4 LightingCook_Torrance( SurfaceOutputRefl s, fixed3 lightDir, fixed3 viewDir, fixed atten ) { fixed kd= saturate( dot( normalize( s.Normal ), normalize( lightDir ) ) ); fixed4 diffuseColor; diffuseColor.rgb = kd * s.Albedo * _LightColor0 * atten; diffuseColor = lerp( diffuseColor, fixed4( s.ReflAlbedo, 0.0 ), s.ReflMaskAlpha ); diffuseColor.a=1; fixed3 V = normalize( viewDir ); fixed3 L = normalize( lightDir ); fixed3 N = normalize( s.Normal ); fixed3 H = normalize( V + L ); fixed NV = dot( N, V ); fixed NH = dot( N, H ); fixed VH = dot( V, H ); fixed NL = dot( N, L ); fixed LH = dot( L, H ); fixed F = _Fo + ( 1 - _Fo ) * ( pow( 1 - dot( V, H ), 5 ) ); fixed NH2 = NH * NH; fixed D = exp( ( NH2 - 1 ) / ( NH2 * _Dm * _Dm ) ) / ( 4 * _Dm * _Dm * NH2 * NH2 ); fixed G1 = 2 * NH * NV / VH; fixed G2 = 2 * NH * NL / VH; fixed G = min( 1, min( G1, G2 ) ); fixed4 c; c = diffuseColor + ( _SpecularColor * max( 0, F * D * G / NV ) * ( 1 - s.MaskAlpha ) ); c.a= 1; return c; } struct Input { fixed2 uv_MainTex; fixed2 uv_BumpMap; fixed3 TtoV0; fixed3 TtoV1; }; void vert ( inout appdata_full v, out Input o ) { TANGENT_SPACE_ROTATION; o.TtoV0 = mul(rotation, UNITY_MATRIX_IT_MV[0].xyz); o.TtoV1 = mul(rotation, UNITY_MATRIX_IT_MV[1].xyz); } void surf( in Input IN, inout SurfaceOutputRefl o ) { fixed4 tex = tex2D(_MainTex, IN.uv_MainTex ); o.Albedo = (_Color.rgb * tex.rgb) * _DiffAmount; o.MaskAlpha = tex.a; o.Normal = UnpackNormal( tex2D( _BumpMap, IN.uv_BumpMap ) ); fixed2 vn; vn.x = dot( IN.TtoV0, o.Normal ); vn.y = dot( IN.TtoV1, o.Normal ); o.ReflAlbedo = tex2D( _ReflectionTex, vn * 0.5 + 0.5 ).rgb; o.ReflMaskAlpha = tex2D( _ReflectionMask, IN.uv_MainTex ).r; o.Alpha = 1; } ENDCG } FallBack "Diffuse" } Game Developer Leegoon copyright all right reserved since 2010.