In article <3f32fc40$1@news.povray.org>, "JK" <bil### [at] mbnetfi> wrote:

> Hi, can the slope pattern be used with a slope_map? The docs say:
> "A slope_map may be used with any pattern except brick, checker, object,
> hexagon, bumps, dents, ripples, waves, wrinkles and bump_map."

It is mathematically possible, but that is also the case for bumps, 
dents, ripples, waves, wrinkles, and bump_map...these are all "special" 
normal patterns. They used to be normal-only patterns, and behave 
slightly differently in normals. (The brick, checker, object, and 
hexagon patterns just aren't useful at all for normal patterns...they 
have abrupt changes between values, rather than smooth gradients.)

The slope pattern is not part of this group, but does require extra 
information to compute...such as the perturbed normal, which is what it 
is being used to compute. In other words, the slope pattern is affected 
by the normal, and when it is used as the normal, it tries to use stuff 
that hasn't been fully computed yet. This could be fixed...I'll bring it 
to the attention of the POV Team.

-- 
Christopher James Huff <cja### [at] earthlinknet>
http://home.earthlink.net/~cjameshuff/
POV-Ray TAG: chr### [at] tagpovrayorg
http://tag.povray.org/

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