To add an element to the set

Choose an element on the list to the right and click it.

To remove an element of the set

Addition of a compatible element to the set unlocks the button "REMOVE LAST ELEMENT" that enables removal of last added set element.

To start over

Press the "RESET" button above the 3D window.

To zoom the view

On desktop/laptop:
Use the mouse scroll to zoom in and out.

On mobile:
Grab the 3D window with 2 fingers and spread them apart to zoom in or move them in to zoom out. Just like in your mobile photo app.

To rotate the view

On desktop/laptop:
Press and hold left mouse button, while moving your cursor in desired direction.

On mobile:
Press and hold 3D window with one finger, while moving it in desired direction.

To pan the view

On desktop/laptop:
Press and hold right mouse button, while moving your cursor in desired direction.

On mobile:
Put two fingers on 3D window and move them around in desired direction.