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On 8 Apr 1999 09:30:15 -0500, par### [at] my-dejanews com (Ron Parker)
wrote:
>I'll bet someone here (maybe even me...) could work out a macro that takes
>an ordered array of 2-d vectors in ([0..1],[0..1]) and calculates the
>appropriate slopes for you. It wouldn't be as versatile as the general
>slope_map, but it might be easier for an artist to work with.
You can pull slopes out of an image (height field) by running it
through the diff function in hflab. I posted a tutorial quite a while
ago about using this and some related tricks to generate slope
dependent textures in standard pov. I think it was in
povray.binaries.tutorials. Using it twice, of course, lets you
identify spots where the slope is changing (rim of a valley, etc.).
If anyone is interested and can't find the tutorial, let me know and
I'll dig up my file copy.
Jerry Anning
clem "at" dhol "dot" com
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