The VSFACEOPACITY variable switches the preset level of transparency for 3D entities. The value can be in the range 0 to 100 percent. The value 100 is limpid, the value 0 is opaque. A negative value stores the transparency but turns off the effect.
Note: An existing visual style is not changed when the system variable gets a new value. Temporary visual style will be created as a clone of visual style assigned for current viewport.