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Can anyone tell me how to apply some angular constraints or torsional forces
with povray/megapov? I started to use some mechsim.inc tools for my
molecule-animations. In the first few tries, the molecules collapsed because
the connections only act as springs (for the distance). What I need to add is
either some kind of torsional stiffness, or better, some angular stiffness
between two connections. How would I do that?
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"Tungsten" <nomail@nomail> wrote in message
news:web.4a65c36bbbcacbccf495ce020@news.povray.org...
>"Tungsten" <nomail@nomail> wrote in message
>news:web.4a488fb8d4d4128cf495ce020@news.povray.org...
>> Can anyone tell me how to apply some angular constraints or torsional
>> forces
>> with povray/megapov? I started to use some mechsim.inc tools for my
>> molecule-animations. In the first few tries, the molecules collapsed
>> because
>> the connections only act as springs (for the distance). What I need to
>> add is
>> either some kind of torsional stiffness, or better, some angular
>> stiffness
>> between two connections. How would I do that?
>>
> Does anybody know where else I should ask this question?
>
PovRay doesn't natively support mechanical simulations so you are dependant
on macros that have been written to implement physical forces. I see that
mechsim.inc was a MegaPOV addition written by Christoph Hormann and I
haven't see him on this group for a long time. I assume you've read his
documentation at http://www.imagico.de/simpov/docu02.html.
I don't think MegaPOV has its own forum anywhere, so I don't think there's
anywhere particularly better to ask your questions than here, apart from
maybe in http://news.povray.org/povray.unofficial.patches/. However, I see
one mechsim question on the patches newsgroup from 2007 that went
unanswered, which could indicate that expertise on those particular macros
is a bit thin on the ground.
You may be able to search further back on the patches forum to around when
that macro was written to see if any discussions then help you to resolve
your current issues.
Otherwise, you might try restructured your question along the lines of: "I'm
using the XXX macro from the xxxx.inc file with these parameters and
variable settings and it does this ...., but I need it to do this .....".
It may be that someone is willing to look through the particular macro that
you need, to see if they can understand it well enough to suggest a suitable
modification.
From your original question I wasn't sure what you meant by "the molecules
collapsed because the connections only act as springs (for the distance)".
Are you saying that you have a couple of objects joined by a single
connection and it can bend without resistance? or that the springiness fails
beyond a certain distance threshold?
Regards,
Chris B.
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