I solved this problem a couple of years ago with my "Portland Burns" 
image. The hard drive with all my code died and I can't seem to recreate it.

The idea is to create a texture map that allows for a transition between 
two other textures with a transition zone in-between. A quick sketch:

box {
   <0, 0, 0>, <1, 1, 0>
   texture {
       planar
       texture_map {
         [clock-0.01 Final_Texture ]
         [clock-0.01 Transition_Texture ]
         [clock Transition_Texture ]
         [clock Clear_Texture ]
}}}

But if I scale this texture or add turbulence on the outer texture, the 
inner textures are also scaled or transformed.

I swear I had pulled this off before but I can't suss it this time.

Any suggestions?

Josh English

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