 | | | Re: Need Help with Physics Engine Animations... | Re: Need Help with Physics Engine Animations... 2004-01-20 - By pmiinalainen
Back
Yeah, sorry for the confusion. The primitives don't work better,
just whole lot faster due to reletively small amount of vertices.
But, in some cases I really had to up the accuracy to the max before
phyhics worked with vertex shapes. I guess very complex shapes can
cause troubles...
Didn't realize the cutnpaste approach though... it's a true power
tip. Thanks a million!
petteri
--- In Carrara@(protected), "robert mcglade" <rmc@(protected)> wrote:
> Actually I have found the opposite to be true, the physics engine
works much better on basic vertex shapes(decimated if you like) and
is less prone to the common errors like falling thru things if you
create the objects in the VM. And you can substitute a basic shape
for the complex shape at rendering. I have not seen the book yet so
don't know how much got in, but the tutorials I wrote for the CS3
handbook go into this.
>
> It's basically a cut and paste operation after you have converted
the animation to explicit.
>
> Rob
> -- -- Original Message -- --
> From: pmiinalainen
> To: Carrara@(protected)
> Sent: Tuesday, January 20, 2004 7:37 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)
> > > > >
> > > > >
> > > > > Yahoo! Groups Links
> > > > >
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>
>
>
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>
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