Instances of MultiLinearCell can be built from scratch or imported. The editor allows the structure to be rotated and scaled, points to be added or removed, sections to be marked for later use, and connections between points to be changed.
New cells have just two points. To extend the structure, press the middle mouse button on a point (or left button with the ALT or SHIFT key held down) and drag out a new segment. To move a point use the left mouse button and to change its radius the right button (or left with the CTRL or META key), dragging up or down to with the mouse button down.
To delete a point and all its descendents, drag the point off the window to the left or right. To delete a point but leave its descendents attached to its parent, drag it off the window to the bottom. To divide a segment in half, click on the blue proto-point at its center.