Wasn't it Paul Bourke who wrote:
>How does one do a cross dissolve between two image based textures 
>based upon the clock variable say.

Use an average texture_map, with the weights of each texture derived
from the clock variable, something like this

texture {
 average texture_map {
  [1-clock texture00]
  [clock   texture01]
 }
}
-- 
Mike Williams
Gentleman of Leisure

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