Subject: Dynamics Oddity... 2003-12-13 - By Scott Hankel
Back
Here's the situation:
I am creating a tire that is bouncing off the ground.
Creating this should be simple as pie.
I created my profile of the tire, revolved it and kept it a NURBS body. I
deleted history off of the new NURBS object which is now in the shape of my
tire.
I created a ground plane along the XZ axis and I raised the tire above the
plane.
With the tire selected I added a Gravity field. I made the ground a passive
rigid body.
I let the simulation play.
The tire falls and hits the ground and sticks there. Since this is a tire I
need it to bounce. So I increase the bounciness of the rigidbody node that
is on the tire to about 1.
I play back the simulation and the same thing occurs.
I increase the bounciness to 2.
Now when I play the simulation back the tire falls, and when it hits the
ground it disappears.
Here is the thing...
When I create a simple NURBS object, a cylinder, a sphere, a cube or
whatever and hook it up to the same gravity field, it behaves as expected.
The object falls and bounces just as one would like it to do.
So here's my question, why can't the tire behave like the primitive objects?
There is nothing special about the tire. I even revolved it as a polygon
object and the same results occur.
Any ideas?
I am running this on my Powerbook G4, 1Gig of RAM, Panther as the operating
system. I have gone through the entire Dynamics book from Alias without a
hitch. So I am confused as to why this seemingly simple thing behaves like
this.
Now one thing which should not be a factor but maybe it is... I made the
tire profile in Illustrator and imported into Maya. Since the new version of
Illustrator does not allow you to save out as older eps's anymore you are
stuck using the straight Illustrator(.ai) import which seems to work fine.
But maybe this somehow screws up how the geometry needs to behave for the
dynamics engine to work.
Any ideas? Any work around for this?
-
Scott h.
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