Re: [osg-users] Character animation in OSG

[Michele Olsen]

Hello,

I've been working in osgCal and cal3d for a few weeks now and one thing I would like to see in osgAnimation is the capability to control a bone during a cycle animation. Specifically, I want to be able to control where a head is looking while an idle animation is playing. I don't think there is a simple way to do it in osgCal or cal3d, or I haven't found it yet. Also, documentation could be improved upon.

Thanks for all your hard work!

Michele

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http://forum.openscenegraph.org/viewtopic.php?p=29926#29926

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[Cedric Pinson]

Hi Michele,
In osgAnimation a Bone inherit from MatrixTransform so a way to do it
run a visitor that will check the matrix of your Bone. Another way could
be to add a Custom callback to your bone that will do something on your
Bone. I have not tried yet but I guess both way should work.

Cheers,
Cedric

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Provide OpenGL, WebGL and OpenSceneGraph services
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[Jan Ciger]

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On 07/12/2010 05:30 PM, Michele Olsen wrote:
> Hello,
>
> I've been working in osgCal and cal3d for a few weeks now and one
> thing I would like to see in osgAnimation is the capability to
> control a bone during a cycle animation. Specifically, I want to be
> able to control where a head is looking while an idle animation is
> playing. I don't think there is a simple way to do it in osgCal or
> cal3d, or I haven't found it yet. Also, documentation could be
> improved upon.
>
> Thanks for all your hard work!
>
> Michele
>

Hello,

You can do this, however, this is deep in the Cal3D data structures.
osgCal is only a thin rendering wrapper.

This is going to be from hazy memory from about 6 years ago when I did
this, so do not take me for my word here.

What you have to do is to get a pointer to the Cal3D Model instance (I
think it was that - I believe osgCal allows you to get the pointer),
from that you can get to the individual bones. However, if you try to
drive the bones manually, you need to disable the default animation
mixer or your data will be overriden. The way to do that is to manually
call the individual functions to update the skeleton, to update the
skin, etc, but do not update the animation mixer. You will need to make
you own mixing if you want to e.g. move the head on top of another
animation. Overall, it is doable, but it is quite a mess - Cal3D is not
designed with procedural animation in mind.

Regards,

Jan
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