To use, turn on Turbo Mode: See Inside -> Edit -> Turn on Turbo Mode If you want to change the scene, change the INIT function. Max Resolution: 480x360 (Scratch Player resolution). Canvas Width and Height are in Pixels. The renderer will automatically stretch the image to the size of the scratch player. Make sure their ratio stays 4:3. Viewframe Width and Height are in in-simulation units (a viewframe width of 1 stretches from X -0.5 to +0.5 ---if the camera is at 0,0,0). Change the ratio between Vw and Vh for interesting results. There are two types of lights: Point, and Directional. Poiont Lights behave like lightbulbs, emitting light from a point in all directions. The vector supplied when they are created is their location. Directional Lights behave like the Sun on Earth (or like a Point Light, infinitely far away) - the direction of the light rays doesn't change at different points in the scene. The supplied vector the lightray's direction vector. Ambient Light is added to points that are not illuminated by any light source, so as to not be pitch black.