Convert a fill to a 3D surface

3D tab > Modify group >  To 3D menu > Convert fills to 3D surfaces, CFH3DFACE

Convert fills and hatch objects with a fill hatch pattern into 3D surface objects.

Do the following:

1. Select the fills and hatch objects that you want to convert.

2. Press Enter.

The program converts the fills and the hatch objects into 3D surface objects. Since a 3D surcafe object can only have four vertices, the program may create several 3D surface objects.