The default Fire Texture show up, but now you want to make the Wave Texture. Use the dropdown menu from this option with it's small arrow. Just like the Wet Texture, this Wave Texture will produce rain and wet effects. It makes use of the Dragwork with the mouse in the "Preview Area". Except the fact that both Wave and Wet textures produce the same effects, the wave effect has and need no source texture, it only uses a color palette, and 20 styles to play with. Again, the clear button will stop the current animating effects to allow the new effects. The "PhongRange" controls the highlighted parts range. The "PhongSize" controls the brightness of the highlited parts of the effect. The "WaveAmp" wave amplitude acts on the effects wave strenght. The "BumpMapAngle" controles the effects sense upwards or Downwards in 3D sight. The "BumpMapLight" controles the effects brightness. With the right settings you can create nice effects as for example a curtain receiving some movement from wind, using the "DropType" : DROP_VerticalOsc with an FX_Size as 255. And for convenience, it is allowed using Wave textures as detail textures on another texture producing nice effects.