SHADEDGEMODE

Type: Integer

Saved: In the registry

Range: 0,1,2

Default: 0

This variable controls how 3D surfaces are shaded and how their edges and isolines are displayed.

0 = Shade faces, displays isolines and edges

1 = Shade faces, displays edges

2 = Shade faces, displays isolines and edges only on highlighted entities

Note: Navigate to Options > Drawing Settings > 3D Settings\ Shading.  Use the dedicated checkbox to modify the variable values.