[Sidefx-houdini-list] Access nurbs parametric uvs

Spencer Lueders Spencer.Lueders at framestore-cfc.com
Wed Jan 16 09:52:22 EST 2008


You could create a uv texture SOP and set it to Rows and Columns which will lay out your nurbs surface parametricly.  Once you filter that in your PC and get the uv location, you can add a point SOP and and wire in your texture UVs into the second input and do a $MAPU2, $MAPV2, $MAPW2. 


----- Original Message -----
From: "François Duchesneau" <sidefx at trinix.ca>
To: sidefx-houdini-list at sidefx.com
Sent: 16 January 2008 09:41:03 o'clock (GMT-0500) America/New_York
Subject: Re: [Sidefx-houdini-list] Access nurbs parametric uvs

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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