// BEGIN

/* FADER by Bob, for use with 'clock' variable */

// white pointlight at camera position
#declare LCX = 1;
#declare LCY = 3;
#declare LCZ = -10;

light_source { <LCX,LCY,LCZ> color rgb <1.5,1.5,1.5>
}
camera {
  location  <LCX,LCY,LCZ>
  angle 22.5
  look_at   <0,0,0>
}

/* FADER [note: imortant factor is the equivalence to zero at onset of
fading ranges] */
#switch (clock)
#range (0,.25)
#declare Fade=1
#break
#range (.25,.5)
// the numbers within parenthesis need to equal 0 at first switch over
#declare Fade=1-((-.25+clock)*4)  // 0.25 * 4 = 1
#break
#range (.5,.75)
#declare Fade=0
#break
#range (.75,1)
// the numbers within parenthesis need to equal 0 at first switch over
#declare Fade=0+((-.75+clock)*4)  // 0.25 * 4 = 1
#break
#end

plane {y,-1
 pigment {checker color rgb <1,1,0>*Fade color rgb <0,1,1>*Fade}
  finish {ambient .25*Fade diffuse .75*Fade specular 1*Fade roughness .05
 // do not use Fade on 'roughness'
             reflection .3*Fade}
}

sphere {0,1 pigment {rgb<1,0,0>}}

// END

Bob

Matt <mat### [at] wctcnet> wrote in message news:37FAD044.5C078306@wctc.net...
> What would be the easiest way to fade in/out a single object in a
> scene?  (I have a tiled floor that I would like to just fade out over a
> few frames.)  Any help and suggestions would be greatly appreciated.
>
> Matt
>

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