A UV question

[LinchpinZA]

I don't use sub-d modelling so I can't help you with that .

But anyways if your mesh's verts are uniformly spaced it is a lot more predictable to know what will happen witht he uv's when ti is smoothed as there wont be much movement with the verts and hence slight movement of uv's .
When a mesh has irregularily spaced geometry components its a bit less predictable to tell what will happen when its smoothed how much vert and uv shifting will happen . like a very densely detailed part next to a part that has very little detail would eb an area of concern , you would then get a bit of movement happening on the overall placement of the vertices when the mesh is smoothed .

How I sometimes test is just applying an average vertex operation on a set of vertices on your low poly mesh , this will give you an idea of how much the verts and UV's will move when you smooth or sub divide to a higher polycount . An example of common vertex movement is if you have a corner on your model that becomes more rounded when you smooth .

All you need to do is a few unfolds/relax's to world space on the UV's inside your UV shells after smoothing , that normally fixes any little distortion problems going from low poly to high poly. However if your mesh isn't that uniform with lots of big changes in spaces between vertices I would suggest unwrapping at the smoothed level of geometry .

[korthuran]

Thanks. I'll have to do some playing around with it but that helps a good bit.

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