Note: Gray vertex at the center has the specified environment.
Light-blue vertices are connected to the center via b-linkages.
Pink vertices are connected to either the center or light-blue vertices via c-linkages.
Rest are white.

How to control the viewer:
Rotate: Drag while holding down the left mouse button to rotate the scene.
Pan: Drag while holding down the middle mouse button (or scroll wheel) to move the scene.
Alternatively hold down the Alt-or-Optio n-key and drag to move the scene.
Zoom: Scroll the mouse wheel to move closer or farther away.
Other tips - Double-clicking (or double-tapping) on the 3D object will select the center of rotation and zoom in to that position (a little).
Ordinary functions with touch screen (1 finger to rotate, 2 fingers to pan and zoom) may work.
Viewer options (incl. full screen mode) can be selected from right-button of the mouse.