On 13-10-08 1:48 AM, Christoph Häni wrote:
Dear Devels,
I'm not sure if I'm going the right way by mailing to this list. I have two
suggestions regarding the persp function from the graphics package:
1. In the documentation of the persp function, it is said, that the "col"
argument will ignore transparent colors. However, this is not true, if you
use strings as color code - at least it works with HEX-code (eg. :
col="#bf000022" would produce a red-colored surface with transparency = 22).
The actual behaviour is that if lighting (controlled by the "shade"
argument) is active, transparency is ignored. However, if
the first colour is transparent, lighting is turned off, so transparency
*will* be used. I'm not sure what the intention was behind the latter
behaviour.
Duncan Murdoch
2. It would be helpful if one could add a surface to an existing plot. I
simply copied persp and deleted the "plot.new()" line, but I guess there
are better ways...
Cheers,
Christoph
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