MicroStation V8i (SELECTseries 3) Introduction to 3D

Select circle; press O at vertex A; press R,A and set origin at A, X-axis at B, and Y-axis at D; move circle to midpoint of edge AB and press O; press Enter to lock axis and move to midpoint of edge AD
Select circle; press O at vertex A; press R,A and set origin at A, X-axis at B, and Y-axis at C; move circle to center of face ABC
Select circle; place circle at midpoint of edge AB and press O; press R,Q and set X-axis to midpoint of edge CD; press Enter to lock axis and select midpoint of AD or BC; press Enter to place circle
Select circle; snap circle to center of face ABCD

AccuDraw in 3D