[Sidefx-houdini-list] Access nurbs parametric uvs

François Duchesneau sidefx at trinix.ca
Wed Jan 16 09:41:03 EST 2008


At first I wanted to use a point cloud too but I thought it was going to 
give me the texture uv attribute.

What is the parametric uv attribute in the Vex/Vop world? It has to be a 
difference somewhere because in other cases one might need the texture 
uv and not the parametric one.

François

Spencer Lueders wrote:
> I recently needed to do the same thing where I used the pointdist() expression to get the uv position but I was using this on ~300k points which took about 30 min to calculate.  
>
> I ended up using a point cloud to get the uv position instead and it droped my calculation times down from 30min to about 1 min.  So if you are using loads of points I would recommend a point cloud.
>
>
> ----- Original Message -----
> From: "François Duchesneau" <sidefx at trinix.ca>
> To: sidefx-houdini-list at sidefx.com
> Sent: 15 January 2008 21:56:53 o'clock (GMT-0500) America/New_York
> Subject: Re: [Sidefx-houdini-list] Access nurbs parametric uvs
>
> Thanks to FrankFirsching on the odForce forum who answered my question 
> one year before I asked it ;)
>
> Now it works with the expressions pointdist combined with unituv.
>
> François
>
> François Duchesneau wrote:
>   
>> Hi, I'm trying to do my own curve projection on a nurbs surface because 
>> I cannot make the Project Sop to work. It always breaks my projected 
>> curve in many segments.
>>
>> What I need for that is access the parametric nurbs uv that correspond 
>> to the isoparm because uvprim expression is reading that, not the 
>> shading uv. Is there an operator that creates that or is it a global 
>> variable?
>>
>> François
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