point based occlusion

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Hi
I was interested in learning how to use point clouds in a vop shader and so took a look at the Houdini Exchange ->
http://www.sidefx.co…pper&Itemid=146 [sidefx.co]
“Hip Files From Point Cloud Presentation May 11th 2005”
I am getting errors in the render- dark patches and light patches (see images). These patches appear in a different part of the image every time I render it.
I guess the original shader I copied is quite old … so there may be some compatibilty issues … not sure.
I am trying to figure out how to create point based occlusion in vops. If any one could take a look at the hip I would much appreciate it.
(the point cloud needs to be generetated first obj->geo1->rop_geometry1)
Thanks!
s

Attachments:
frame.32.jpg (42.2 KB)
frame.31.jpg (42.3 KB)
pBasedOcclusion.hip (113.5 KB)

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