[Sidefx-houdini-list] Rman VOP displace shader

Sean Lewkiw seanl at rainmaker.com
Mon Jun 18 13:56:37 EDT 2007

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,

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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Sean Lewkiw
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