// Pixel shader rendering normal as color

half4 main( half3 pnormal : TEXCOORD0 ) : COLOR
{
  half3 npos = max(pnormal,0.0);
  half3 nneg = max(-pnormal,0.0);
  half3 c = npos.xyz + (nneg.yzx + nneg.zxy);
  return half4(c,1);
}