Jellby <jel### [at] M-yahoocom> wrote:
> Among other things, Skeety saw fit to write:
>
> >  Anyone know why a flame (texture/material defined with media) will show
> >  up
> > perfectly with nothing (black) in the background...but as soon as
> > I put a wall (plane) behind it...the flame disappears?
> >
> > I've verified that the object is in front of the wall...but not sure why
> > the wall makes it disappear.
>
> Maybe you have your plane inside-out?
>
> Add "hollow" to the plane definition or invert the normal (i.e. if you have
> {plane z, 1} change it to {plane -z, -1})
>
> --
> light_source{9+9*x,1}camera{orthographic look_at(1-y)/4angle 30location
> 9/4-z*4}light_source{-9*z,1}union{box{.9-z.1+x clipped_by{plane{2+y-4*x
> 0}}}box{z-y-.1.1+z}box{-.1.1+x}box{.1z-.1}pigment{rgb<.8.2,1>}}//Jellby

yep!  that was it!

thanks man!

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