Hi my friends, I import a 2D dwg file into the Sharp 3D, as shown in the figure below. But I cannot extrude the special-shaped plane. Only those circles can be extruded. Could anyone help me to fix it. Thanks so much.
Hi
I guess your figure is not closed circuit. If you tap the line it will be highlighted and you see where it is disconnected. Happens to me all the time 
You are right! I missed some points. Thanks!