- To: mathgroup at smc.vnet.net
- Subject: [mg14469] Re: LightSources
- From: Martin Kraus <mkraus at theorie3.physik.uni-erlangen.de>
- Date: Fri, 23 Oct 1998 20:58:47 -0400
- Organization: Regionales Rechenzentrum Erlangen, Germany
- References: <email@example.com>
- Sender: owner-wri-mathgroup at wolfram.com
Maarten.vanderBurgt at icos.be wrote:
> In the MathGroup archives I found two messages with some questions
> regarding light sources. I attach them below. I did not find any
> answers or responses to them. Currently I have the same questions as in
> these two messages. I did read section 2.9.12 in the book and related
> help items. But this does
> not answer all these questions.
> Is there anyone who knows more about this or who can point me to the
> right sources?
> Maarten van der Burgt
> Icos Vision Systems
Actually I am the author of one of these messages and got a response
Wolfram (I do not have an e-mail address of the developer) about this,
which essentially states that the calculation of shadings is wrong in
Mathematica, but very difficult to fix. As the bug is know, it might
be fixed in the next version of Mathematica.
(Therefore I decided to calculate the shading in my applet
documented in the Mathematica book.)
If you succeed to simulate the wrong calculations of Mathematica, please
know! I wasted some time on this without success. My basic result was
that there is
probably more wrong than only a unnormalized view point vector.
Good luck anyway!
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