PureBoard

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   float refractR = 0, refractG = 0, refractB = 0;
   Ray refractRay;
   CVector4 I, negI, newNormal;
   float cosI = 0;
   float cosT = 0;

   newNormal = normal;
   newNormal.x *= -1; newNormal.y *= -1; newNormal.z *= -1;
   I = RayShapeIntersect - ray.origin;
   negI = CVector4(-I.x, -I.y, -I.z);
   I.Normal();
   negI.Normal();
   
   refractRay.origin = ray.origin;
   cosI = negI.DotProduct3(newNormal);
   cosT = 1.0f - refractVal * refractVal * (1.0f - cosI * cosI);
   
   refractRay.direction.x = refractVal * I.x +
                          ((refractVal * cosI - sqrt(fabs(cosT))) * newNormal.x);
   refractRay.direction.y = refractVal * I.y +
                          ((refractVal * cosI - sqrt(fabs(cosT))) * newNormal.y);
   refractRay.direction.z = refractVal * I.z +
                          ((refractVal * cosI - sqrt(fabs(cosT))) * newNormal.z);
   
   refractRay.direction.Normal();

   if(refractVal > 0)
      {
         if(g_RecurseLevel <= MAX_RECURSION)
            {
               g_RecurseLevel++;
               TraceScene(shape, totalShapes, lights, totalLights, refractRay,
                          refractR, refractG, refractB);
               g_RecurseLevel--;

               r += refractR * refractVal;
               g += refractG * refractVal;
               b += refractB * refractVal;
            }
      }