Hello,
I’m trying to refresh my memory, as I haven’t used Rhino in a while.
Are subds more flexible to modify than polysurfs?
I asked this question in my last post because I have this object a “closed solid polysurface” that I can’t modify… the iso curves…
If you want sharp edges and clean surfaces, subd is not the right tool. This looks like a boolean intersection of two extruded curves.
Hi @pou010
If you have the curves before you made the polysurface those would be the thing to modify.
But you can alter the polysurface by using the command solidptson
Or by exploding the polysurface, editing and rejoining.
RM
that depends a lot what you want to do, with nurbs its sometimes easier to rebuild it entirely when you have several trimmed surfaces that are joined at the edges like here. when you are working with single surfaces like torus, pipes, or anything that was lofted along some curves or similar and you have history enabled you can lay out a good method to quickly rework entire parts in a simple manner without having to rebuild anything.
with subd everything can be moved and pushed around much easier but you would have to select entire areas of faces to change the shape which makes it possible but at the same time also a bit more cumbersome to work with.
I’ve already managed to make my object editable. Before, it was impossible. I don’t remember exactly what I pressed anymore, it’s scary 
, I’m going too fast… thank you for your answers
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Might help to slow down and explain what works and what doesn’t…
And when you really want someone to help you: Post your file.
Also, SubD objects always have zero curvature normal to creases and other sharp edges. So the shape shown above could not be duplicated exactly as a SubD object.