Hi Ken!

OK, maybe I am way off here and the problem is with POV 3.1's media (in this
case ignore the rest of this message), but back in the old days when POV was
still 3.0 and media was still atmosphere, I beat you to the process, so no
chance for a patent :-)

I posted the image in this group some time ago and it is still here. Check
out my posting: "Warden of the King's sword" from 5/9/98.
The image probably uses the atmosphere effect a little too much, but hey, I
*was* going for a smoky, dusty room (notice the hot coals? ;-)

The image used for the stained glass window is a GIF image, and I it used as
a simple pigment like this (POV 3.0 code):

pigment {
   image_map {
      gif   "KAISER.GIF"
      once
      interpolate 2
      filter all 1.0
   }
}

This, together with a bright spotlight outside of the window and four
area-lights (one in each torch) did the trick.

Well, then again, you probably never had any problems with POV 3.0 and
atmosphere, and all the buzz was related to achieving the same effect with
POV 3.1 and media...

So long
Johannes.


Ken wrote in message <370### [at] pacbellnet>...
>Greetings Pov People,
>
> The title of this message comes from an off had comment I made
>yesterday in .general. I mentioned if I ever figured out a way
>to get an image map like a stained glass window to interact with
>media I would patent the process. Wouldn't you know it I achieved
>that goal this evening. It needs refinement but the process works
>as can be seen in the very preliminary example.
>
>  You should be able to see a light atmospheric haze and the image
>you see is actually projected from off the screen to the right
>across to the opposite wall and steps area. As this took close to
>8 hrs. to render I am unlikely to pursue this particular image any
>further. It was mostly a proof of concept image and I am more than
>willing to share my work to date with anyone interested in how the
>process works.
>
>
>  You will see at about one third the way down the image a streak
>or difference in appearance. This was caused by me from stopping
>the render at that point. I opened the file in the photon patch
>and choose the continue rendering function to compare the behaviour
>between the two versions. Nathan has added a true parallel ray
>function to the cylinder light source which is what I was using
>behind the image map. It is obvious that it has a very different
>effect on the way it interacts with scattering media. I stopped it
>rather quickly after seeing how it looked and finished the render
>in the official build of Pov 3.1. For the amount of time spent
>rendering it was not worth it to start over to remove it plus I
>want Nathan to see the difference as well.
>
>--
>Ken Tyler
>
>mailto://tylereng@pacbell.net

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