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Subdivision Surfaces With Creases


vladius
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I think it would be great, if 3DC would have a creasing capability for its Catmark subdivision algorithm. For now you have to beveledges that are supposed to be creased. That workaround is hard to manage (doubles vertices narrow to each other). Such approach is also not really useful for inward edges, that are shown on the illustration:

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The "Sculpt -> Retopo -> Subdiv Sculpt" workflow is very useful for complex curvy (car-design-like) hard-surface modelling. No matter how much you smooth with your brushes, you won't get a subdiv-quality CAD-like surface flow. This is much like in raster graphics where you won't get ideal tweakable gradients in Gimp or Photoshop - when you need those, you use a vector editor like Illustrator with its gradient meshes. 

 

Take a look at this ZB video using the technique I described:

 

Seems like ZB is also missing correct creased subdivs, but has a special tool that creates double edges with a help of lasso tool.

 

You may also take a look at the OpenSubdiv tech by Pixar: http://graphics.pixar.com/opensubdiv/docs/intro.html It is bound by and Apache license, so you could incorporate it without troubles. With the help of OpenSubdiv or not, 3DC would benefit greatly from a more advanced subdivision-assisted workflow.

 

P.S. Subdivs are also an industry standard for animated characters, so a quick and valid retopo-mesh subdiv preview would also be a great plus for 3DC as taking part in different movie companies' pipelines.

P.P.S. If you need a pair of hands to implement the feature, I'm also bounty-hunting as a programmer and open for cooperation.

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