 | | | Re: Need Help with Physics Engine Animations... | Re: Need Help with Physics Engine Animations... 2004-01-19 - By darylcrandall2002
Back
If you look back through this forum's archives you'll see lots of
discussion about animations, some of them less than flattering.
I've been able to make physics behave most of the time but watch out
for what I call the "ghosting effect". Some objects that are in
contact with each other at the beginning of time are not treated
properly.
If one is static (the floor) and the other dynamic (a domino) the
domino might just fall through the floor (even with the floor
defined as a plane or even another cube such as another domino!!!)
I've even had two dynamic dominoes fall through each other. Being in
contact seems to be the killer though. Separate the object by a
teeny bit and things are "usually" OK again. (shouldn't have to do
that though. Grrr...) I'm talking about Carrara 2, but from what
I've seen on this list, not much in this function area has changed
with Carrara 3.
The other thing about Carrara physics is the god awful length of
time it takes to do calculations for even simple operations.
Although it "usually" works out in the end if you have a movie to
watch or a book to write while you're waiting. However it does seem
to work.
I once made a five link chain, secured both ends with the chain not
taut and started the clock. The final animation is very realistic,
the middle of the chain drops and bounces around waggling back and
forth just like you'd expect it too but it took 3 hours for a 6
second movie. It's a very complex calculation but I'm dying to try
it on my copy of Maya5 PLE (Personal Learning Edition) (free with
November's "Digit" magazine).
The FIRST thing I did with Maya5 PLE was the domino test. I made a
pyramid of 9 dominoes and animated it falling when a ball hit it.
Maya practically calculated the thing in real time! Try that in
Carrara and you can make dinner while you're waiting.
Point being, that yes, physics does work in Carrara but it could be
MUCH better.
Daryl
--- In Carrara@(protected), "ccoles_avengers"
<ccoles_shado@(protected)> wrote:
> Hi Charles,
>
> Wow, didn't realize the restrictions re: the infinite plane.
Thanks
> for the guidance. Also, thank you for the tip on where the physics
> engine on/off switch is located. I usually access "Scene" only to
> make sure that my rotations are correct (i.e. to say - when I am
doing
> scene rotations), so I can see where I missed seeing it.
>
> Thanks again for your speedy reply. :)
>
> "Selocic"
>
> --- In Carrara@(protected), "Charles Brissart" <charles@(protected)>
wrote:
> > Hi,
> >
> > first, don't use an infinite plane with physics. The physics
engine
> does not
> > support the infinite planes. Use the plane instead.
> >
> > To turn off the physics calculation, select the scene and in the
scene
> > properties you will see the check box at the bottom ( you might
need to
> > scroll down).
> >
> > Charles
> >
> > -- -- Original Message -- --
> > From: "ccoles_avengers" <ccoles_shado@(protected)>
> > To: <Carrara@(protected)>
> > Sent: Sunday, January 18, 2004 2:17 PM
> > Subject: [Carrara] RE: Need Help with Physics Engine
Animations...
> >
> >
> > > Hi All,
> > >
> > > I am a newbie to Carrara Studio 3 (as well as 3D Gfx) and this
is my
> > > first post to the list so your patience is most
appreciated :) .
> > >
> > > I have been experimenting with the phyisics engine and have
been
> > > sucessful with animating some test files using this feature
but have
> > > been stumped by certain anomalies which crop up in other
files. For
> > > example, when trying to animate a domino chip, I can
successfully have
> > > the chip drop down from the sky and bounce on the ground using
a
> > > downward directional force as well as have the chip knocked
over
> > > successfully by a rolling sphere. However, when I create a
file that
> > > only contains the chips (three chips in total w/o the sphere),
I have
> > > noticed that the chips literally GO THROUGH the infinite
plane, as
> > > well as go into directions that I never expected. Also, they
don't
> > > bounce like in the file containing just the single domino
chip. They
> > > go into weird positions and then drift either backwards or down
> > > through the infinite plane.
> > >
> > > Could anyone help me with this? What I am trying to
eventually do is
> > > to make a few dominoes fall down but have definitely run into
snags
> > > such as what I have described.
> > >
> > > Any advice or links pointing towards more CS3 online physics
tutorials
> > > would be much appreciated.
> > >
> > > Also, I read that the physics engine can be turned "off" when
making
> > > modifications to objects, etc. For some reason I can not find
that
> > > particular feature and the only way I have been turning the
physics
> > > engine "off" is by switching to a different type of motion for
each
> > > object when making changes. Somehow, this doesn't seem
right. Right
> > > now, unless there are major changes, I don't change the motion
type
> > > and keep the physics engine active all the time. However, if
someone
> > > can share with me where in CS3 I can locate the "physics engine
> > > on/off" feature/setting, I'd be much obliged. :)
> > >
> > > Thank you for your help.
> > >
> > > "Selocic"
> > >
> > > PS - I currently only have web access to these messages so
please
> > > excuse any delay in my responses. Thank you.
> > >
> > >
> > > To unsubscribe send a message to
> > > Carrara-unsubscribe@(protected)
> > >
> > >
> > > Yahoo! Groups Links
> > >
> > > To visit your group on the web, go to:
> > > http://groups.yahoo.com/group/Carrara/
> > >
> > > To unsubscribe from this group, send an email to:
> > > Carrara-unsubscribe@(protected)
> > >
> > > Your use of Yahoo! Groups is subject to:
> > > http://docs.yahoo.com/info/terms/
> > >
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