Is there a way to import 3d objects with joints into Jitter and if so, is it

possible to address each joint separately in order to simulate physics?

Composition, Music Technology, CCTAD, CHCI

http://www.music.vt.edu/people/faculty/bukvic/

Is there a way to import 3d objects with joints into Jitter and if so, is it
possible to address each joint separately in order to simulate physics?

Ivica Ico Bukvic, D.M.A.
Composition, Music Technology, CCTAD, CHCI
Virginia Tech
Dept. of Music - 0240
Blacksburg, VA 24061
(540) 231-1137
(540) 231-5034 (fax)
ico@vt.edu
http://www.music.vt.edu/people/faculty/bukvic/
http://ico.bukvic.net


importing-3d-objects-with-joints

> Is there a way to import 3d objects with joints into Jitter and if so, is it

> possible to address each joint separately in order to simulate physics?

> Composition, Music Technology, CCTAD, CHCI

On 5/31/07, Ivica Ico Bukvic  wrote:
> Hi all,
>
> Is there a way to import 3d objects with joints into Jitter and if so, is it
> possible to address each joint separately in order to simulate physics?
>
> Many thanks!
>
> Ivica Ico Bukvic, D.M.A.
> Composition, Music Technology, CCTAD, CHCI
> Virginia Tech
> Dept. of Music - 0240
> Blacksburg, VA 24061
> (540) 231-1137
> (540) 231-5034 (fax)
> ico@vt.edu
> http://www.music.vt.edu/people/faculty/bukvic/
> http://ico.bukvic.net
>
>
>
>


None specific. I am wondering whether this can be used at all in Jitter in

the first place. If this was possible, then my second questions was your

> From: jitter-bounces@cycling74.com [mailto:jitter-bounces@cycling74.com]

> Subject: Re: [jitter] importing 3d objects with joints

> > Is there a way to import 3d objects with joints into Jitter and if so,

> > possible to address each joint separately in order to simulate physics?

> > Composition, Music Technology, CCTAD, CHCI

None specific. I am wondering whether this can be used at all in Jitter in
the first place. If this was possible, then my second questions was your
first one ;-).

> -----Original Message-----
> From: jitter-bounces@cycling74.com [mailto:jitter-bounces@cycling74.com]
> On Behalf Of Wesley Smith
> Sent: Thursday, May 31, 2007 6:23 PM
> Subject: Re: [jitter] importing 3d objects with joints
>
> What format is the joint data in?
>
> wes
>
> On 5/31/07, Ivica Ico Bukvic  wrote:
> > Hi all,
> >
> > Is there a way to import 3d objects with joints into Jitter and if so,
> is it
> > possible to address each joint separately in order to simulate physics?
> >
> > Many thanks!
> >
> > Ivica Ico Bukvic, D.M.A.
> > Composition, Music Technology, CCTAD, CHCI
> > Virginia Tech
> > Dept. of Music - 0240
> > Blacksburg, VA 24061
> > (540) 231-1137
> > (540) 231-5034 (fax)
> > ico@vt.edu
> > http://www.music.vt.edu/people/faculty/bukvic/
> > http://ico.bukvic.net
> >
> >
> >
> >


Here is how you could do it, but it is not trivial. That said it is

also not incredibly difficult. It will just take some time. What you

want to do is export your model and for each vertex export a list of

bones they are attached to along with a corresponding weighting

factor. Usually vertices will have 3 or 4 bones with the total weight

adding to 1. Once you have this, you will export your bone

orientations and positions which can be in a number of formats but

will eventually need to be converted to a 3x4 matrix (modelview matrix

without the last row). This data, sent to a skinning shader will

animate your mesh according to the underlying bone structure and it

As far as joints are concerned, you could model them in jit.gl.lua

with the ODE module. Just figure out who to setup the different joint

types in ODE and position them correctly, and the simulation should

> None specific. I am wondering whether this can be used at all in Jitter in

> the first place. If this was possible, then my second questions was your

> > From: jitter-bounces@cycling74.com [mailto:jitter-bounces@cycling74.com]

> > Subject: Re: [jitter] importing 3d objects with joints

> > > Is there a way to import 3d objects with joints into Jitter and if so,

> > > possible to address each joint separately in order to simulate physics?

> > > Composition, Music Technology, CCTAD, CHCI

Here is how you could do it, but it is not trivial.  That said it is
also not incredibly difficult.  It will just take some time.  What you
want to do is export your model and for each vertex export a list of
bones they are attached to along with a corresponding weighting
factor.  Usually vertices will have 3 or 4 bones with the total weight
adding to 1.  Once you have this, you will export your bone
orientations and positions which can be in a number of formats but
will eventually need to be converted to a 3x4 matrix (modelview matrix
without the last row).  This data, sent to a skinning shader will
animate your mesh according to the underlying bone structure and it
will look good.

As far as joints are concerned, you could model them in jit.gl.lua
with the ODE module.  Just figure out who to setup the different joint
types in ODE and position them correctly, and the simulation should
take care of the rest.

On 5/31/07, Ivica Ico Bukvic  wrote:
> None specific. I am wondering whether this can be used at all in Jitter in
> the first place. If this was possible, then my second questions was your
> first one ;-).
>
> Ico
>
> > -----Original Message-----
> > From: jitter-bounces@cycling74.com [mailto:jitter-bounces@cycling74.com]
> > On Behalf Of Wesley Smith
> > Sent: Thursday, May 31, 2007 6:23 PM
> > Subject: Re: [jitter] importing 3d objects with joints
> >
> > What format is the joint data in?
> >
> > wes
> >
> > On 5/31/07, Ivica Ico Bukvic  wrote:
> > > Hi all,
> > >
> > > Is there a way to import 3d objects with joints into Jitter and if so,
> > is it
> > > possible to address each joint separately in order to simulate physics?
> > >
> > > Many thanks!
> > >
> > > Ivica Ico Bukvic, D.M.A.
> > > Composition, Music Technology, CCTAD, CHCI
> > > Virginia Tech
> > > Dept. of Music - 0240
> > > Blacksburg, VA 24061
> > > (540) 231-1137
> > > (540) 231-5034 (fax)
> > > ico@vt.edu
> > > http://www.music.vt.edu/people/faculty/bukvic/
> > > http://ico.bukvic.net
> > >
> > >
> > >
> > >
>
>


Many thanks for the explanation. All this being said, is there a particular

3d modeler software that makes this transition less cumbersome than others?

Also, I am just curious if anyone has already had a chance to actually

> Here is how you could do it, but it is not trivial. That said it is

> also not incredibly difficult. It will just take some time. What you

> want to do is export your model and for each vertex export a list of

> bones they are attached to along with a corresponding weighting

> factor. Usually vertices will have 3 or 4 bones with the total weight

> adding to 1. Once you have this, you will export your bone

> orientations and positions which can be in a number of formats but

> will eventually need to be converted to a 3x4 matrix (modelview matrix

> without the last row). This data, sent to a skinning shader will

> animate your mesh according to the underlying bone structure and it

> As far as joints are concerned, you could model them in jit.gl.lua

> with the ODE module. Just figure out who to setup the different joint

> types in ODE and position them correctly, and the simulation should

> > None specific. I am wondering whether this can be used at all in Jitter

> > the first place. If this was possible, then my second questions was your

> > > From: jitter-bounces@cycling74.com [mailto:jitter-

> > > Sent: Thursday, May 31, 2007 6:23 PM

> > > Subject: Re: [jitter] importing 3d objects with joints

> > > On 5/31/07, Ivica Ico Bukvic wrote:

> > > > Is there a way to import 3d objects with joints into Jitter and if

Many thanks for the explanation. All this being said, is there a particular
3d modeler software that makes this transition less cumbersome than others?

Also, I am just curious if anyone has already had a chance to actually
implement some of this?

> -----Original Message-----
> From: jitter-bounces@cycling74.com [mailto:jitter-bounces@cycling74.com]
> On Behalf Of Wesley Smith
> Sent: Thursday, May 31, 2007 9:32 PM
> Subject: Re: [jitter] importing 3d objects with joints
>
> Here is how you could do it, but it is not trivial.  That said it is
> also not incredibly difficult.  It will just take some time.  What you
> want to do is export your model and for each vertex export a list of
> bones they are attached to along with a corresponding weighting
> factor.  Usually vertices will have 3 or 4 bones with the total weight
> adding to 1.  Once you have this, you will export your bone
> orientations and positions which can be in a number of formats but
> will eventually need to be converted to a 3x4 matrix (modelview matrix
> without the last row).  This data, sent to a skinning shader will
> animate your mesh according to the underlying bone structure and it
> will look good.
>
> As far as joints are concerned, you could model them in jit.gl.lua
> with the ODE module.  Just figure out who to setup the different joint
> types in ODE and position them correctly, and the simulation should
> take care of the rest.
>
> best,
> wes
>
> On 5/31/07, Ivica Ico Bukvic  wrote:
> > None specific. I am wondering whether this can be used at all in Jitter
> in
> > the first place. If this was possible, then my second questions was your
> > first one ;-).
> >
> > Ico
> >
> > > -----Original Message-----
> > > From: jitter-bounces@cycling74.com [mailto:jitter-
> bounces@cycling74.com]
> > > On Behalf Of Wesley Smith
> > > Sent: Thursday, May 31, 2007 6:23 PM
> > > Subject: Re: [jitter] importing 3d objects with joints
> > >
> > > What format is the joint data in?
> > >
> > > wes
> > >
> > > On 5/31/07, Ivica Ico Bukvic  wrote:
> > > > Hi all,
> > > >
> > > > Is there a way to import 3d objects with joints into Jitter and if
> so,
> > > is it
> > > > possible to address each joint separately in order to simulate
> physics?
> > > >
> > > > Many thanks!
> > > >
> > > > Ivica Ico Bukvic, D.M.A.
> > > > Composition, Music Technology, CCTAD, CHCI
> > > > Virginia Tech
> > > > Dept. of Music - 0240
> > > > Blacksburg, VA 24061
> > > > (540) 231-1137
> > > > (540) 231-5034 (fax)
> > > > ico@vt.edu
> > > > http://www.music.vt.edu/people/faculty/bukvic/
> > > > http://ico.bukvic.net
> > > >
> > > >
> > > >
> > > >
> >
> >


The closest ive come to any of this is object morphing with same 

vertex count objects, and ones that are fairly simple too.

I would love to see this work, as a current project could really come 

to life with anything learned from this. I also remember seeing 

someone's webpage who frequents the list who did a human model in 3D 

that looked like it was animated, but names escape me.

On May 31, 2007, at 10:34 PM, Ivica Ico Bukvic wrote:

> Many thanks for the explanation. All this being said, is there a 

> 3d modeler software that makes this transition less cumbersome than 

> Also, I am just curious if anyone has already had a chance to actually

>> From: jitter-bounces@cycling74.com [mailto:jitter- 

>> Subject: Re: [jitter] importing 3d objects with joints

>> Here is how you could do it, but it is not trivial. That said it is

>> also not incredibly difficult. It will just take some time. What 

>> want to do is export your model and for each vertex export a list of

>> bones they are attached to along with a corresponding weighting

>> factor. Usually vertices will have 3 or 4 bones with the total 

>> adding to 1. Once you have this, you will export your bone

>> orientations and positions which can be in a number of formats but

>> will eventually need to be converted to a 3x4 matrix (modelview 

>> without the last row). This data, sent to a skinning shader will

>> animate your mesh according to the underlying bone structure and it

>> As far as joints are concerned, you could model them in jit.gl.lua

>> with the ODE module. Just figure out who to setup the different 

>> types in ODE and position them correctly, and the simulation should

>>> None specific. I am wondering whether this can be used at all in 

>>> the first place. If this was possible, then my second questions 

The closest ive come to any of this is object morphing with same  
vertex count objects, and ones that are fairly simple too.

I would love to see this work, as a current project could really come  
to life with anything learned from this. I also remember seeing  
someone's webpage who frequents the list who did a human model in 3D  
that looked like it was animated, but names escape me.

> Many thanks for the explanation. All this being said, is there a  
> particular
> 3d modeler software that makes this transition less cumbersome than  
> others?
>
> Also, I am just curious if anyone has already had a chance to actually
> implement some of this?
>
> Best wishes,
>
> Ico
>
>> -----Original Message-----
>> From: jitter-bounces@cycling74.com [mailto:jitter- 
>> bounces@cycling74.com]
>> On Behalf Of Wesley Smith
>> Sent: Thursday, May 31, 2007 9:32 PM
>> Subject: Re: [jitter] importing 3d objects with joints
>>
>> Here is how you could do it, but it is not trivial.  That said it is
>> also not incredibly difficult.  It will just take some time.  What  
>> you
>> want to do is export your model and for each vertex export a list of
>> bones they are attached to along with a corresponding weighting
>> factor.  Usually vertices will have 3 or 4 bones with the total  
>> weight
>> adding to 1.  Once you have this, you will export your bone
>> orientations and positions which can be in a number of formats but
>> will eventually need to be converted to a 3x4 matrix (modelview  
>> matrix
>> without the last row).  This data, sent to a skinning shader will
>> animate your mesh according to the underlying bone structure and it
>> will look good.
>>
>> As far as joints are concerned, you could model them in jit.gl.lua
>> with the ODE module.  Just figure out who to setup the different  
>> joint
>> types in ODE and position them correctly, and the simulation should
>> take care of the rest.
>>
>> best,
>> wes
>>
>> On 5/31/07, Ivica Ico Bukvic  wrote:
>>> None specific. I am wondering whether this can be used at all in  
>>> Jitter
>> in
>>> the first place. If this was possible, then my second questions  
>>> was your
>>> first one ;-).
>>>
>>> Ico
>>>
>>>> -----Original Message-----
>>>> From: jitter-bounces@cycling74.com [mailto:jitter-
>> bounces@cycling74.com]
>>>> On Behalf Of Wesley Smith
>>>> Sent: Thursday, May 31, 2007 6:23 PM
>>>> Subject: Re: [jitter] importing 3d objects with joints
>>>>
>>>> What format is the joint data in?
>>>>
>>>> wes
>>>>
>>>> On 5/31/07, Ivica Ico Bukvic  wrote:
>>>>> Hi all,
>>>>>
>>>>> Is there a way to import 3d objects with joints into Jitter and if
>> so,
>>>> is it
>>>>> possible to address each joint separately in order to simulate
>> physics?
>>>>>
>>>>> Many thanks!
>>>>>
>>>>> Ivica Ico Bukvic, D.M.A.
>>>>> Composition, Music Technology, CCTAD, CHCI
>>>>> Virginia Tech
>>>>> Dept. of Music - 0240
>>>>> Blacksburg, VA 24061
>>>>> (540) 231-1137
>>>>> (540) 231-5034 (fax)
>>>>> ico@vt.edu
>>>>> http://www.music.vt.edu/people/faculty/bukvic/
>>>>> http://ico.bukvic.net
>>>>>
>>>>>
>>>>>
>>>>>
>>>
>>>
>

I think they used OSC to send to a 3d modelling program. That is

certainly the easiest way to go. For getting the data in Jitter, your

guess is as good as mine. I don't really use 3d modelling programs.

The one time I tried to get the bone and weight data from Maya, I was

confronted with having to write a C++ plugin. I wasn't about to go

there because the Maya docs are pretty crap when it comes to their

plugin API. I would love for this to be possible though as Maya has a

fantastic interface for creating skinning weights and joints.

> The closest ive come to any of this is object morphing with same vertex

> count objects, and ones that are fairly simple too.

> I would love to see this work, as a current project could really come to

> life with anything learned from this. I also remember seeing someone's

> webpage who frequents the list who did a human model in 3D that looked like

> On May 31, 2007, at 10:34 PM, Ivica Ico Bukvic wrote:

> Many thanks for the explanation. All this being said, is there a particular

> 3d modeler software that makes this transition less cumbersome than others?

I think they used OSC to send to a 3d modelling program.  That is
certainly the easiest way to go.  For getting the data in Jitter, your
guess is as good as mine.  I don't really use 3d modelling programs.
The one time I tried to get the bone and weight data from Maya, I was
confronted with having to write a C++ plugin.  I wasn't about to go
there because the Maya docs are pretty crap when it comes to their
plugin API.  I would love for this to be possible though as Maya has a
fantastic interface for creating skinning weights and joints.

On 5/31/07, vade  wrote:
> The closest ive come to any of this is object morphing with same vertex
> count objects, and ones that are fairly simple too.
>
> I would love to see this work, as a current project could really come to
> life with anything learned from this. I also remember seeing someone's
> webpage who frequents the list who did a human model in 3D that looked like
> it was animated, but names escape me.
>
>
>
>
>
> On May 31, 2007, at 10:34 PM, Ivica Ico Bukvic wrote:
>
> Many thanks for the explanation. All this being said, is there a particular
> 3d modeler software that makes this transition less cumbersome than others?
>
> Also, I am just curious if anyone has already had a chance to actually
> implement some of this?
>
> Best wishes,
>
> Ico
>
>
> -----Original Message-----
> From: jitter-bounces@cycling74.com
> [mailto:jitter-bounces@cycling74.com]
> On Behalf Of Wesley Smith
> Sent: Thursday, May 31, 2007 9:32 PM
> Subject: Re: [jitter] importing 3d objects with joints
>
> Here is how you could do it, but it is not trivial.  That said it is
> also not incredibly difficult.  It will just take some time.  What you
> want to do is export your model and for each vertex export a list of
> bones they are attached to along with a corresponding weighting
> factor.  Usually vertices will have 3 or 4 bones with the total weight
> adding to 1.  Once you have this, you will export your bone
> orientations and positions which can be in a number of formats but
> will eventually need to be converted to a 3x4 matrix (modelview matrix
> without the last row).  This data, sent to a skinning shader will
> animate your mesh according to the underlying bone structure and it
> will look good.
>
> As far as joints are concerned, you could model them in jit.gl.lua
> with the ODE module.  Just figure out who to setup the different joint
> types in ODE and position them correctly, and the simulation should
> take care of the rest.
>
> best,
> wes
>
> On 5/31/07, Ivica Ico Bukvic  wrote:
> None specific. I am wondering whether this can be used at all in Jitter
> in
> the first place. If this was possible, then my second questions was your
> first one ;-).
>
> Ico
>
>
> -----Original Message-----
> From: jitter-bounces@cycling74.com [mailto:jitter-
> bounces@cycling74.com]
>
> On Behalf Of Wesley Smith
> Sent: Thursday, May 31, 2007 6:23 PM
> Subject: Re: [jitter] importing 3d objects with joints
>
> What format is the joint data in?
>
> wes
>
> On 5/31/07, Ivica Ico Bukvic  wrote:
> Hi all,
>
> Is there a way to import 3d objects with joints into Jitter and if
> so,
>
> is it
> possible to address each joint separately in order to simulate
> physics?
>
>
> Many thanks!
>
> Ivica Ico Bukvic, D.M.A.
> Composition, Music Technology, CCTAD, CHCI
> Virginia Tech
> Dept. of Music - 0240
> Blacksburg, VA 24061
> (540) 231-1137
> (540) 231-5034 (fax)
> ico@vt.edu
> http://www.music.vt.edu/people/faculty/bukvic/
> http://ico.bukvic.net
>
>
>
>
>
>
>
>
>
>
> v a d e //
>
> www.vade.info
> abstrakt.vade.info
>
>
>
>
>
>
