XOR’s Boundary Fit Surfacing function helps you to easily create a surface body using boundary curves on the mesh, even if the mesh is a complex freeform shape.
This technical tip will help you understand how to create a high quality fitting surface.
Step 1: Mesh Optimization
To get a high quality fitting surface, you will first need [...]

Create fit surfaces by drawing a patch network on the mesh:

As you can see below, there are some cases where the trimmed surfaces will produce a bad result. Specifically, the “Tangent Constraint On Boundary” option, which uses mesh normals to match continuity, sometimes gives a bad result.
(In General, you should avoid drawing patch boundary curves [...]