Normally the biggest part of the GUI is reserved for the 3-D viewport. In fact this 3-D viewer is threefold and has different properties for each of the tabs of the tools section. For the Entities tab the 3-D viewport shows the currently selected shape and reflects all editing operations performed on that shape. Also the x-, y- and z-axes are shown to assist navigating in space. With the Puzzle tab activated an overview of the current problem is presented: the result shape (double sized) on top and a single instance of each shape used as pieces below it. Finally, for the Solver tab, the 3-D viewer can be used to browse all assemblies found and/or show an animation of the moves involved in the disassembly of the puzzle.
Any object in the 3-D view can be rotated by simply dragging it, and the scrollbar on the right allows zooming in or out on that object by respectively moving the slider down or up or by using your mouse-wheel. Note that the zoom settings are independent for each of the three tools tabs.
Extra options for the 3-D viewer are available in the Config menu (→Config Menu).