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On Tue, 07 Apr 1998 01:16:44 +0200, Hans-Detlev Fink <hdf### [at] pecos de>
wrote:
>> Doesn't a slope of 1.0 correspond to a "vertical" surface, while 0.5
>> corresponds to "horizontal?"
>
>No. Well, depends on vertical with respect to what. You are
>right if you mean a surface that is perpendicular to y.
>I meant vertical in the everday way, ie a surface that is parallel
>to y (like a wall etc.).
Doh! I even looked at the code you mention, but I messed up on that
one. The _normal_ is vertical for slopes of 0 or 1. Oops.
BTW, one fix for the bug you mention in the readme file is to use a
symmetrical color map. This works in cases where you don't draw a
distinction between horizontal and "anti-horizontal." In other cases,
such as the pyramid with sand on one surface, this won't work.
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