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I've translated Malcolm Kesson's Cellular Automata SL into a Houdini VOP RSL Network (no reason). You can find the original SL on his website: http://www.fundza.com/rman_shaders/cellular/index.html
Main difference is that Houdini VOPs don't support Arrays so I used multiple connections and 8 texture calls instead of a for loop. Let me know if there is some better way of querying neigbours.
Original shader cell size and count is dependant on micropolgyons and controlled by shading rate. I've set the shading rate to a very high value and the cell count is controlled by geometric subdivision instead. That meant I couldn't use random function for initialization so I replaced it with cellnoise shadeop.

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Updated 03-01-2012 at 11:59 PM by Artur

Tags: fractal , houdini , prman , renderman , rsl , shader

Categories

Technical

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",

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

Categories

Technical

some more on authors youtube channel

Hey kids!
I've been busy working on this little thing:



<iframe width="560" height="315" src="http://www.youtube.com/embed/_4d7miYVkeM" frameborder="0" allowfullscreen></iframe>

Be back soon.