Tutti-frutti effect

The tutti-frutti effect is a texture effect which can appear on walls. The texture is rendered distorted and there are often colors drawn which are not part of the original texture. These colors are the reason behind the name of the effect.

Tutti-frutti can be caused in several ways:
 * 1) If a wall is taller than its texture, then the texture is tiled vertically. But the Doom rendering engine starts new tiles only at 128, 256, 384, etc. If the texture is less than 128 units tall, horizontal bands will be left undefined.
 * 2) If a texture with transparent areas is used as an upper or lower texture on a two-sided wall, the content of the transparent areas is undefined. (By definition, only the middle can see through to the sector behind the wall.)
 * 3) If a texture with transparent areas is used as the texture on a one-sided wall, the content of the transparent areas is undefined.