Getting a UV position based on selected CV..

[Robert Bateman]

If the UV's have not been modified, then a point on the surface (defined in UV coords) will match a scaled version of the texture coords (the paremetric surface point will be defined between the maxu/minu maxv/minv attributes). If however you have edited the nurbs surface UV's in UV edit mode, then, erm, i don't know.... (the patchUVIds of a nurbs Surface may hold the key, but dunno.... )

I don't think it's possible at all from CV's since most of them are not on the surface....

[dr.rastaman]

You can try to do this with the help of a closestPointOnSurface-node. Given a worldSpace-coord it results the closest Point on a surface and the parameterU and parameterV at this point.

- create a closestPointOnSurface (in script editor execute: createNode closestPointOnSurface)
- connect worldSpace-Attribute of your nurbsSurface to inputSurface-Attribute of closestPointOnSurface-Node
- query worldSpace-coords of selected cv (vector $pos=`xform -q -ws -t nurbsSurface.cv[3][3]`)
- set inPosition-Attribute of closestPointOnSurface to $pos (setAttr closestPointOnSurface1.inPosition ($pos.x) ($pos.y) ($pos.z) )
- then closestPointOnSurface1 holds parameterU and parameterV that you want

Hope it helps...

[InvaZimm]

doc.. thanks that seems to work out great.
I was thinking that I probably was going to need the world space value of the CV but hadn't come across the node to place it in to get what I was looking for.. Kept coming across the pointOnSurface node not the closest one lol..

thanks again..

[CGTalk Moderation]

This thread has been automatically closed as it remained inactive for 12 months. If you wish to continue the discussion, please create a new thread in the appropriate forum.