You've provided some very nice examples of what your include file can do.  I 
agree that my colors are too bright. I think the problem with the angle of 
the 'bows' is how I am determining the viewing and lighting angles. The 
project has been abandoned for now but if I do revisit this I may take a 
closer look at your implementation. The colors I used were just some values 
I hard coded into the source.

Regarding the render times, it was the isosurface that slowed things down 
along with two media containers; the one that comes with hf2iso and a box in 
front of the camera that I included to simulate scattered rain. The 
combination of several densities, scattering media, and isosurfaces really 
slows things down, especially since for each intersection with the media it 
has to check if any part of the isosurface is blocking the light.

I think that if you implemented your method in the emitting media in the 
source it would speed up render times several fold.

-Mike


"Florian Siegmund" <flo### [at] gmxat> wrote in message 
news:web.4952d7fd619c0ff387129fc00@news.povray.org...
> Take a glance at this one...
> The image was rendered within one week on a Pentium DualCore 3.6Ghz with 
> 2GB
> RAM; I don't know the exact time it took to render though, because I 
> stopped
> and continued tracing several times. For this image, I used Jaime Vives
> Piqueres' 'Project Tierra' landscape include files and my own ones for the
> rainbow, and I'm quite happy with the result. Still I'm using emitting 
> media
> rather than scattering one, because it renders faster and my include file
> contains the possibility to 'project' a pattern onto the rainbow, e.g. 
> clouds,
> to get the illusion of a 'broken' rainbow (not used in this image, but
> possible, if someone liked to use this feature).
>
> Mike, your rainbow seems a little bit too 'perfect' to me, like it was an
> illustration taken from a fairy tale book; most of all because of the 
> powerful
> colors. Maybe this is your aim, because the viewer still gets a very 
> special
> impression in this case, I don't know. If you wanted to achieve that, you 
> are
> going into the right direction (yes, I like the image; put a crystal 
> dragon
> into the scene and I would like it even more!) But for getting an image 
> with a
> more realistic look, you should work on the colors and angles of the 
> rainbow
> once more. One more thing to say, I wonder about your rendering times... 
> what
> is it that kills your processor speed, the rainbow media or the landscape
> isosurface? By default, my rainbow media only takes 2 media intervals. 
> There is
> no need of taking more intervals in normal cases, beacause I tweaked the 
> density
> function in a way so that it renders nearly like the inbuilt 'fog' feature 
> in
> pov-ray (assuming that reflecting water droplets are distributed 
> constantly
> along the viewing ray). Hope this helps a little bit.
>

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