Many 3D projects on Scratch don't turn their camera or consist of only one pen color at a time. This is because if the camera moves, it is hard to determine which object to render first so that the pen doesn't overlap with other objects. When two objects are in the same place, it only renders the one object. The dots appear in order of distance to Scratch Cat. Though the farthest should appear last in a true 3D engine, that is an easy fix.