Use the arrow keys to rotate the shape: right/left rotate the shape around the y-axis and up/down rotate the shape around the x-axis. Use the WASD keys to move the shape. Use Q and E to enlarge/shrink the shape. Press R to reset the shape's position, rotation, and size. Press space to toggle on/off the debug view. Toggling the "Points" variable on/off will show/hide vertex points. Press keys 1-3 to choose the shape to render: 1 is a cube, 2 is a pyramid, and 3 is an octahedron.
For something more advanced, take a look at this: https://scratch.mit.edu/projects/189395035/ My first (and thus old) 3D project! Each wireframe uses a series of points to render. Check out the new version (with filled faces) here: http://scratch.mit.edu/projects/22906476/ UPDATE: 5/30/14: I got it to draw offscreen now by using a massive costume for the render sprite. Scratch sure is weird. UPDATE 5/18/14: Changed vertices to use pen instead of stamping to reduce lag and increase quality. UPDATE 5/8/14: I added a Z-plane depth detection system with dots at the vertices to show that. To show the vertices, press space to open the debug options, and change "Points" from 0 to 1. ~TiberiumFusion~