Just figured that I can also get the specularity-image
by placing all objects without texture aside of the
specular finish, no background etc... Thus I get
black image with specularity. Well...
Wanted a go at that kind of system (accessing all pixels).
Even though the purpose now defies itself somewhat,
I still have the algorithm for accessing the pixels etc. Might
come in handy at some time.
Why go the short way, when there's a long one, eh? :-(

-- 
Tim Nikias v2.0
Homepage: http://www.digitaltwilight.de/no_lights
Email: Tim### [at] gmxde

> I've cropped the part of the image where the effect
> isn't that obvious. When you look at the edge of
> the superellipsoid in the upper left corner, you'll
> notice the highlight "bleeding" into the background.
> Even more obvious is on the green superellipsoid,
> where the highlight bleeds into the shadow.
> I think it adds a nice touch to the image, even though
> the parsing times are... ehm... Quiet high (depending
> on amount of objects to be tested and resolution).
>
> Here's a quick overview over the macros:
> The first one shoots trace() at the scenery and tries to
> hit objects which were given via an array. When an
> object is hit, the specularity (given by another array, using
> the values you'd normally hand as specular and roughness)
> is calculated and saved for that pixel. The results are saved
> to disk.
> Then, you may choose varying paths:
> 1. Display the specular-data as triangles in front of camera
> (no antialiasing possible then).
> 2. Use a macro to just display the specularity data as gray-shaded
> image (white=highlight, black=no highlight), [modify the resulting
> image via a paint programm] and display the image back onto
> the screen via another maco (antialiasing possible)
> 3. Use a macro to blur the specularity data. This blurring keeps the
> old data retained and adds the blurred data to a new file. Highlights
> won't get blurred away. Display the new data. (no antialiasing)
> 4. Use macro to blur, but then output blurred data to gray-shaded
> image. Use image for display (antialiasing)
>
> I have yet to write a macro which may take image and generate
> data off of that (though I see no reason why anyone would want
> that, I do want the "system" to be complete: there's data to
> image converter, so I need a reverse effect).
>
> One thing I noticed, due to color-clipping and gamma-issues,
> results will vary when comparing using data vs image. Still, this
> blinding effect adds to the realism of the image (IMHO), because
> it occurs in camera's and the human eye. Now on to some
> lens flares, and I should be able to modify the image to look
> like a photo... :-)
>
> -- 
> Tim Nikias v2.0
> Homepage: http://www.digitaltwilight.de/no_lights
> Email: Tim### [at] gmxde
>
>

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