FaceTexture.shader

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Shader "Custom/FaceTexture" {
   Properties
    {        
            _MainTex ("Front", 2D) = "white" {}
            _Side ("Side", 2D) = "white" {}
    }
    SubShader
    {
         Pass
            {            
                GLSLPROGRAM 

                uniform sampler2D _MainTex;
                uniform sampler2D _Side;
                varying vec4 textureCoordinates;
                
                varying vec3 n;
                                       
                #ifdef VERTEX   
                
                void main()
                {          
                   textureCoordinates = gl_MultiTexCoord0;
                   n = gl_Normal;
                   
                    gl_Position = gl_ModelViewProjectionMatrix * gl_Vertex;
                }
                #endif  
           
                #ifdef FRAGMENT
                
                void main()
                {
                
                   float yOffset = 0.03f;
                
                   float frontX = textureCoordinates.x;
//                 float frontY = textureCoordinates.y - 0.06f;
                   float frontY = textureCoordinates.y;
                   
                   float siderX = textureCoordinates.x - 0.3f - 0.25f * textureCoordinates.y; 
                   float sidelX = 1.0f - textureCoordinates.x - 0.3f - 0.25f * textureCoordinates.y;
//                 float siderX = textureCoordinates.x - 0.6f * textureCoordinates.y + 0.1f;  
                   
                   
//                 float sidelX = 0.8f - textureCoordinates.x - 0.3 * textureCoordinates.y ;// + 0.39f * -textureCoordinates.y - 0.04f;
//                 float siderX = 0.65f + textureCoordinates.x;// - 0.6f * textureCoordinates.y + 0.1f;  
                   
//                 float sideY = textureCoordinates.y - 0.062f;
                   float sideY = textureCoordinates.y - yOffset;
                   
                   
                   vec4 f = texture2D(_MainTex,  vec2(frontX, frontY));
                       
                   vec4 sl = texture2D(_Side,  vec2(sidelX, sideY));
                   vec4 sr = texture2D(_Side,  vec2(siderX, sideY));
                   
                   float mixl, mixr, mixf;
                   
                   float gf = (f.r + f.g + f.b) / 3.0f;
                   
                   float Pi = 3.1415926535897932384626433832795f;
                   float sigma = 0.1f;
                   float m = 0.5f;
                   float x = textureCoordinates.x;
                   float prob = 1.0f / sqrt( 2.0f*Pi*pow(sigma,2.0f) ) * exp( -(pow(x-m,2.0f)/(2.0f*pow(sigma,2.0f) )));
                   
                   float p = 1.0f - prob * 0.2f;
                   
                   if(n.x < 0.0f) {
                       mixl = 0.0f;
                       mixr = abs(n.x) * p;
                       
                       mixf = 1.0f - mixr;
                   }
                   else {
                       mixl = abs(n.x) * p;
                       mixr = 0.0f;
                       
                       mixf = 1.0f - mixl;
                   }
                   
                   vec4 c = sl * mixl + sr * mixr + f * mixf;
                   
                   if(n.z < 0.0f)
                       gl_FragColor = vec4(0.0f,0.0f,0.0f,1.0f);
                   else
                       gl_FragColor = c;
                }
                #endif                          
                ENDGLSL        
            }
     }
}