Transparent surfaces should not block VIS, or a 'hall of mirrors' effect can result. The surface will not be affected by dynamic lighting. A powerful feature of SimpleShade is the ability to allow users to 'turn off' layers on performance limited systems. Therefore layers with low priority numbers are eliminated first, and those with higher numbers eliminated last. Frame delays are propagated downward, therefore a constant framerate can be had by defining only the first framedelay.
Individual frames can have arbitrary frame delays for maximum flexibility.
A layer can have a maximum of 24 image frames. This function was implemented to exploit built-in functionality of glpnglib, and can be useful for reusing a single texture with different transparency masks. The default is to repeat the texture in both the S and T directions. These keywords are designed to be easy to remember, but relate directly to OpenGL blendfuncs. NONE Turns blending off for the current layer.