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While debugging some of my occlusion shaders, I've put together simple RIB and SL demonstrating two pass pointcloud based refractions using indirectdiffuse shadeop. It's a pretty old trick but never officially documented for some reason. First off, pointcloud baking shader:

Code:

surface simple_bake
(
	uniform float bake = 0;
	uniform string ptc_file = "mybake.ptc";
	uniform float ptc_interpolate = 0;
	uniform float ptc_radiusscale = 1 
)
{
  normal Nn = normalize( N );
  if( bake != 0 )
  {
     bake3d( ptc_file, "", P, Nn, "_radiosity", Cs, "coordsystem", "world", "interpolate", ptc_interpolate, "radiusscale", ptc_radiusscale );
  }
  Ci = Cs;
}

Refraction shader

Code:

surface refractive
(
	uniform float  pointbased = 1;
	uniform string ptc_file = "";
	uniform string envmap = "";
	uniform float  blur = 0.1;
	uniform float  ior = 1.1
)
{
  vector In = normalize( I );
  normal Nn = normalize( N );
  vector Refr = refract ( In, Nn, ior );
  Ci = indirectdiffuse( P, Refr, 0, 
			"pointbased", pointbased,
			"filename", ptc_file,
			"environmentmap", envmap,
			"coneangle", blur,
			"clamp",

...

Tags: 3delight, blurry refractions, pointbased refractions, pointcloud refractions

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‎ Technical