[Sidefx-houdini-list] Rman VOP displace shader

Louis Dunlevy ld at dneg.com
Mon Jun 18 13:58:34 EDT 2007

just the old float to vector VOP with it's output set to be a point.

Sean Lewkiw wrote:
> But... but... but.... how?  If I plug a vector into it, (I assume you 
> mean the aaNoise VOP), it errors.  I tried to roll my own aaNoise and 
> change the sig of offset to be a vector, but that didn't work, 
> (although it didn't error).  How do I pass in three floats (I assume 
> you mean a vector), to an input expecting a point?
> Thanks in advance,
> Sean
> Louis Dunlevy wrote:
>> You'll notice the offset input is set to be a point rather than a 
>> vector. PRman transforms that as the camera moves.
>> Bad SESI >:o  .. naughty naughty....
>> just pass in the offset as 3 floats and combine them! 8-)
>> Sean Lewkiw wrote:
>>> Hi,
>>> I've built an RMAN VOP displacement shader using the VOP aanoise.  
>>> When I animate the camera, the noise moves.  So I added an 
>>> rsl_transform node, from "current" to "world". Still moves.  Tried 
>>> an in-line VOP with:
>>> transform("object",P);
>>> ... no joy.  Tried:   vtransform("current", "world", P);
>>> ... no joy.  Then I tried to pipe the first transform above into 
>>> another in-line VOP with
>>> noise(pp*10) * .2;
>>> ... and it works, the noise sticks.  Is the Houdini RMAN aanoise VOP 
>>> broken?  (I see lots of space change warnings in my .err files about 
>>> the voplib.h files.)
>>> Sean
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