This wiki was in read-only mode for many years, but can now be edited again. A lot of information will need to be updated.
TextureMatrix
The texture matrix object allows you to define how a texture will appear in an material. It can be used to manipulate still (fixed) textures as well as animated ones.
Code
textureMatrix name example_texmat scale 0.0 0.0 1.0 1.0 spin 0.0 shift 0.0 0.0 center 0.5 0.5 fixedscale 0.0 0.0 fixedspin 0.0 fixedshift 0.0 0.0 end  | 
Texture Matrix must be used in conjunction with the Material object using texmat. valid parameters for a Material are: <properties> name=name for reference scale=u/v freqs, u/v scales spin=rotation freq shift=u/v freqs center=dynamic u/v center (for spin and scale) fixedscale=time invariant u/v scale fixedspin=time invariant rotation fixedshift=time invariant u/v shift </properties>
Examples
Texture Matrix is often used to create the appearance of flowing water or lava with the "shift" argument.