In object (picture) mode: - Use the left and right arrows to select an object. - Press space to draw the object in 3D. In 3D drawing mode: - Use left and right arrows to rotate the drawing. - Use up and down arrows to tilt the drawing. - Press B to change the backdrop and C to change the pen color. - Press R to select a new object to draw. - Press S to change the drawing style.
If you're remixing, you can upload any image file you want as a new costume for the object sprite. Just make sure to erase the background and center the costume on the canvas. The code will automatically scan each new object right before rendering it. Objects with radial symmetry around a central vertical axis will work best, obviously.