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| | Author's Comment: Lavina About Part 13 | About effect 13: I call it lightsource... So a bitmap is drawn and the surfaces are mapped to an invisible plane where a texture of light is moved around, creating a kind of 3D illusion. First one light is used then another is added with a different color and they are additive, which means stacking their brightness and also the colors "mix" to a new color when they meet.
The only trick here was that the "usable" 2 colors per character position were not enough at some places to correctly draw the torus knot so I also used $FF16 color at "some" places. You can see those problematic pixels at this animation. So I change that fixed color throughout the screen in some raster lines accordingly with the actual color of their surface. Of course, the visuals had to be optimized because with this technique we are able to correct only one location (one surface) per rasterline. This also means that the raster time is lost for almost the entire screen area due to the $FF16 color manipulation.
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