 | | | Subject: Dynamics Oddity... | Subject: Dynamics Oddity... 2003-12-14 - By Richard Brak
Back
Are the tires normals pointing outwards? This can cause problems.
Richard.
> 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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