Hei,
What is the difference between Closed planar curves and closed curves? with closed planar curves we can connect it straight to surface component and it creates surfaces. with closed curves it give red component by saying “curve cannot be converted into surface”. Another option is to use Patch component. But i would like to understand them and how their logic goes on.
Here is small example.
Curvestosurfaces.gh (138.3 KB)
It’s in the name itself.
Closed PLANAR curves - are curves that are on the same plane, thus you can create a planar surface.
Where “closed curves” - are curves that have no common plane, but they are still closed.
Think of it this way - if the control points of your curve can be placed on a single common plane, then you have a planar curve. If they cannot be placed on a single plane, but each point coordinate is somewhere in the World - you have just a closed curve.
This is why in the first case you can create a planar surface, and in your second case, you can just patch.
These are some elementary geometry principles. I suggest you do a bit of reading on it.
Rhino’s help pages are a good place to start.
Thanks! In case we project the curves to xy plane, do they get converted automatically to planar curves?
Yes, they will.