NukeBlinkShit.cpp

kernel UVmap : ImageComputationKernel<ePixelWise>
{
  Image<eRead,eAccessRandom, eEdgeClamped> src;    //I
  Image<eWrite> dst;                               //O  
  local:
    float width;                                   
    float height;                                  
  
  void init() {
    width = src.bounds.x2;                         //function to find right edge
    height = src.bounds.y2;                        //function to find top edge
  }
  float sphere(float3 pos, float r)
  {
    return length(pos) - r;
  }
  float map(float3 pos)
  {
  
    float3 q = pos;
    q.x = fmod(q.x + 4.0f, 8.0f) - 4.0f;
 q.z = fmod(q.z + 4.0f, 8.0f) - 4.0f;
 q.y = fmod(q.y + 4.0f, 8.0f) - 4.0f;


     float d = sphere(q, 1.5f);
 
      return d;
  }
  
  float3 computeNormal(float3 pos)
  { 
    return normalize(float3(
        map(pos + float3(0.1f, 0.0f, 0.0f)) - map(pos - float3(0.1f, 0.0f, 0.0f)),
        map(pos + float3(0.0f, 0.1f, 0.0f)) - map(pos - float3(0.0f, 0.1f, 0.0f)),
        map(pos + float3(0.0f, 0.0f, 0.1f)) - map(pos - float3(0.0f, 0.0f, 0.1f))
    ));
  }
  void process(int2 pos) {

    float2 fg = float2(pos.x, pos.y);
    float2 ires = float2(width, height);
    // (fragCoord -.5 * iResolution.xy) / iResolution.y;
    float2 uv = (fg - .5f * ires)/ires.y;    
    
   float3 rd = normalize(float3(uv,1.0));
    float3 pos2 = float3(25.0f, 5.0f, -15.0f);
   float3 color = float3(1.0f,0.0f, 0.0f);
   
  color = float3(uv.x, uv.y, uv.x * uv.y);


    for(int i=0; i < 512; i++)
    {
      float d = map(pos2);
      if(d < 0.01)
      {
        
         color = float3(1.0f); 
         float3 nws = computeNormal(pos2);
         float3 sunPos = float3(-2.f, 2.f, -4.f);
         float sunFactor = dot(normalize(nws), normalize(sunPos));
         
         float3 basicColor = float3(.2f, .3f, .88f);
         color = basicColor * sunFactor * normalize(pos2);
        
      }
       pos2 += d * rd;    
    }
//rendering with a fog calculation (further is darker)
    
    dst(0) = color.x;                        
    dst(1) = color.y;                          
    dst(2) = color.z;
    dst(3) = 1.0f; 
  }
};