Hi all,
can someone help me to transform a trimmed surface into an untrimmed surface?
Unfortunately, you can’t. The trimmed parts are just hidden for you, but they are still there.
is not there a way to do it? time ago I did it but now I don’t remember how I did 
is not there a way to do it? time ago I did it but now I don’t remember how I did
Not possible, that can never be an untrimmed surface. It has holes.
I understand! So starting from 3 curves, is there a way to create an untrimmed surface?
IF there are holes then no. Untrimmed surfaces have 3 or 4 outside edges and no internal edges (holes)
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Why do you need it as untrimmed?
I need to create a grid on that surface
Create grid on untrimmed surface. Cut the wholes atferwards into the grid.
In fact in the rare occasion where trims are short paths (in a way the case with planar stuff and convex 3-4 edge holes) you can approximate the underlying surface as an untrimmed one using short paths, division pts etc etc.
But this is a rather rare case anyway.
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You can just deconstruct brep, and then insert the edges into the boundary surface to get an untrimmed surface.
