 | | | Subject: Dynamics Oddity... | Subject: Dynamics Oddity... 2003-12-14 - By Scott Hankel
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Thanks all!
It was the Normals...
I should have guessed that after doing some extensive modeling late last
nite after I posted the question.
Thanks again!
-
Scott h.
on 12/14/03 3:34 AM, Karsten Bitter at tencars@(protected) wrote:
> Yes,
> normal direction would be my first guess too,
> but about your curve from Illustrator:
> if you're uncertain about it, just use it as a template
> and draw a similar (Maya)curve on top of it
> and try with that one...(and again, check for the normal direction
> on the resulting surface).
>
> regards,
> Karsten
> -- -- Original Message -- --
> From: "Richard Brak" <r.brak_pb@(protected)>
> To: <maya@(protected)>
> Sent: Sunday, December 14, 2003 10:48 AM
> Subject: Re: Dynamics Oddity...
>
>
>> 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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>>
>>
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>
>
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