 | | | Re: Thanks All / Still Need Help with Physics Engine Animations... | Re: Thanks All / Still Need Help with Physics Engine Animations... 2004-01-20 - By ccoles_avengers
Back
Thanks, everyone, for your responses re: this topic.
I definitely have noticed the primitive anomaly that Petteri
mentioned. I even did a test with the CS3 Wizard "Bascule" animation
file which incorporates a sphere, plank, and cube and noticed a couple
of things. When I simply added my domino (originally created in AMAPI
but used w/ and w/o conversion through the CS3 Vertex Modeler) onto
the plank as a test, the domino, cube, and plank all fell through the
floor! However, when I inserted a simple primitive cube from CS3, it
basically worked without a problem (however there was a problem re:
where the new cube was placed which caused the plank to go through the
floor. With a simple placement adjustment, it worked fine).
Quick Question: is there a better format to export/import objects
from AMAPI to CS3? I have been using the 3DS format to export my
models from AMAPI. When I use the *.a3d format, I either get errors
or it is SO SMALL that I have to increase the size tremendously. Up
until now, the 3DS format has been working fine for my CS3 still
images, but perhaps there is a better file format for which to import
AMAPI objects into CS3 for animations.
Another Question: Has anyone noticed that there is a shift with
objects from frame 0 to frame 1 when using the physics engine? This
seems to have a significant affect on the animation calculations. I
know that the manual indicates that certain changes (like resizing)
can not be made on or after frame 1 when using the physics engine.
However, when I want to make placement or even size adjustments in
frame 0, I notice a noticeable "shift" in the objects from frame 0 to
frame 1. Is there a way to prevent this?
Last Question: I have been looking at buying the CS3 Handbook for a
while now. I was wondering if anyone had a link to a site that is
selling it inexpensively? Any recommendations would be appreciated.
Also, David, I am *definitely* interested in what you have to say re:
object substitution, so plan on seeing a reminder on the list from me
next week. :)
Again, thanks to everyone for your help. I am really enjoying reading
the good advice on this list and I appreciate the helpful people
who contribute to it.
Take care.
Claudia
"Selocic"
(a newbie)
--- In Carrara@(protected), "David Bell" <nordwind53@(protected)> wrote:
> You can do the substitute thing as Carrara exists now ... remind me
next week when I am not so buried and I will try to write down the
process.
>
> Yours,
> David
> __ ____ ____
>
> Nordwind53@(protected)
> David E. Bell
> __ ____ ____
>
> -- -- Original Message -- --
> From: pmiinalainen
> To: Carrara@(protected)
> Sent: Tuesday, January 20, 2004 2:37 AM
> Subject: [Carrara] Re: Need Help with Physics Engine Animations...
>
>
> couple of notes about physics. They seem to calculate faster on
> basic primitives, i.e. spheres, cubes etc. No matter if you have
> scaled them. If you do your domino test with realistic blocks with
> rounded edges, it will be slower. It sometimes seems that vertex
> models require more accurate and slower calculation in order to
> behave realistically.
>
> I think it would be great if you could do animation with reference
> objects and then substitute them for high-resolution versions for
> rendering. I really hope we'll see that feature in the future.
>
> petteri
>
> --- In Carrara@(protected), "darylcrandall2002" <Daryl@(protected)>
> wrote:
> > 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)
> > > > >
> > > > >
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>
>
>
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>
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