Success!
After sending the previous message, I realized that the line you sent was
similar to the line I had just sent. After some experimentation, I  arrived
at the following:

isosurface {
   function { y -(1-clock)* P1 (x,0,z).red*0.4-clock*P2(x,0,z).red*0.4}

It works exactly as desired. I'm posting a clip (with 2nd half of loop added
in VideoMach) in povray.binaries.animations.
Thanks a lot for helping me with this.
Steve



ABX <abx### [at] abxartpl> wrote in message
news:1j2g2vorak2gve9rrinj1d1ffu6hu4dlef@4ax.com...
> On Fri, 17 Jan 2003 08:57:17 -0500, "Steve Shelby" <ssh### [at] rexnetnet>
wrote:
> > #declare P1=function{pigment{leopard ...
> > #declare P2=function{pigment{leopard ...
>
> assuming clock goes from 0 to 1 it could be something like:
>
>   #declare P=function{(1-clock)*P1(x,y,z).gray+clock*P2(x,y,z).gray};
>
> such solution in extended form was used in:
>
> http://news.povray.org/povray.binaries.animations/23891/167475/wip.mpg
>
> ABX

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