Here's a surface
How to cap this whole area without creating 18,746 loft features on the already messed up tree ?
Filled surface and Boundary surfaces, when they work, make a mess
(actually: even loft makes a mess... leaves open edges behind that cannot be knitted)
This shape was created by trimming two surfaces
Many tools have a "Cap end" option, but never the one you need
Solidworks is a disease in this area!
There are two thousand of ways to do this on Creo or non parametric CADs like 3ds max
The following picture shows why the problem is not so trivial: the curvature must be obeyed. Such a curvature can be obtained on the "trim tool" that trimmed this one
When a feature has the "cap end" option, the capped area does obey the curvature. Unfortunately the "trim surface" feature doesn't have this option