Talk:Part ShapeFromMesh
Related forum discussion
What does "sew shape" mean when converting a mesh to a solid?
https://forum.freecad.org/viewtopic.php?t=84463
If I read this correctly, my interpretation from the options in the dialog is: - By default ("Sew shape" unticked), Part → Create shape from mesh creates a compound of faces. This is what covers most use cases. - With "Sew shape" ticked, Part → Create shape from mesh creates a compound of shells. This is not usable to most, yet it can reduce computing time by 90%. I guess also depending on the tolerance value. - You should not use this function for a model with millions of meshes