Does a rectangle in a sketch directly define a Face?

paul_sorensen

Does a rectangle in a sketch directly define a Face in Onshape, or does it have to be made part of another entity to become a Face?

paul_chastell

Any closed region in the sketch, which can be visually identified by being slightly gray and opaque, can be used almost anywhere that a face is needed. They are effectively planar faces of surfaces, and so if a face of a solid part is needed they won't be usable. Given that the sketch creates those faces after the position of the geometry is determined the sketch itself does not see its own faces while positioning the geometry, though it can see and use faces created by earlier sketches.

shanshan

you must have gotten this sketch plane before creating this sketch, why do you still need the face created by the rectangle? we can create planes by any sketch entities directly.

paul_sorensen

A previously answered question in the forum mentioned that Onshape exposed a somewhat simplified representation of the underlying Parasolid model.  Trying to better understand when line segments become edges, (fins, loops), faces, etc.  Since once exit the sketch the rectangle is referred to as a Face in Extrude UI, just curious if it was also considered a face within the sketch itself.

paul_chastell

Any closed region in the sketch, which can be visually identified by being slightly gray and opaque, can be used almost anywhere that a face is needed. They are effectively planar faces of surfaces, and so if a face of a solid part is needed they won't be usable. Given that the sketch creates those faces after the position of the geometry is determined the sketch itself does not see its own faces while positioning the geometry, though it can see and use faces created by earlier sketches.