WIreframe Surface Display

In these images there are two surface. The one on the left I created and the one on the right someone much more experienced with rhino gave me while that he created from my data.

In wireframe mode, my surface shows all kinds of crosshatching. While he surface only shows the outline.

This make me suspect that there is some kind of surface cleanup that I am not doing.

If so, what might the be?

Isocurves are probably turned off (not displayed) on the second surface. Isocurves off or on only affects the display, not the math of the object.

I’m not familiar with the Mac version but in the Windows version the isocurves can be turned off/on in Properties with the object selected.

You are correct. Thanks.

Same place with Rhino for Mac.