Creasing SubD components to sim a trim

[ryguy]

I'm not quite sure what you are trying to do but with Maya SubD's, I recommend doing all your modeling in polygons first, then convert it to a SubD and do your edits on level 0. If needed, you can refine to higher levels for more detail.

To crease an edge, simply select an edge or multiple edges and select either a partial or full crease. Before doing a crease, make a duplication of your model just in case you want to change the type of crease. You can undo it, however for some reason you will still see the crease in the wire frame of the subD, even if you undo your crease. That's why it is always good to keep different copies of the progress of your models... just incase you want to go back to a certain point.

Maya SubD's are still in their infancy and require a bit of extra care. Check out a few of my articles on subD's at http://www.3ee.com/ryguy/.

~Ryan

[ivankio]

Thanks ryan, I've seen that "Dealing with slow results with Maya SubDivision Surfaces" some time ago and use it but got no chance to thank you, so... thank you.:thumbsup:

I do use poly, and only miss MAX for it's meshsmooth, while Maya's smooth proxy doesn't have creases and subd are heaaavy. Well in this image I may have it clearer:

http://www.fourx.com.br/cursomaya/subd_crease.jpg
- First the poligon object for this simplyfied example.
- Second is something near of what I want in the model I'm making. I've done it with quadratic NURBS patches, but I don't want to convert all my complex model to NURBS just because of a corner. So I'll try to atchieve the same results here with subdivison surfaces.
- Third is the subD geometry, with every edge in the hole creased, but the top curved surface doesn't mantain continuity and have some dark artifacts in the smoothing of the corners.
- Fourth I didn't crease the hole's wall so it wouldn't crease the vertices in the hole's open, but it doesn't keep the shape of the hole neither the shape of the top surface.

I just can't figure out how to do that corner (a extruded inner "L" shape smooth subdivision surface).

[ivankio]

Hum... It looks like it would only be possible if "crease edge" had an option like preserve "paralel", "transversal" or "both". So you could choose if you want it to maintain the curvature along it's defining faces or adjacent edges.

[ivankio]

One other difficulty: I mirror the surface (scale -1), attach it to the original, the mirrored half has normals pointing inside. If i freeze transformation before, the object receive oposite display flag. I couldn't reverse normals in polygon because it would mess my creases.

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