[osg-users] Animating vertices in a Geode

Cedric Pinson mornifle at plopbyte.net
Mon Mar 23 03:35:30 PDT 2009

Hi Laurence,

You can easily do it with morphgeometry:
- define two geometry with morphgeometry
- use an custom update callback that use an ease motion to control the 
ratio of geometry to use

Would be great to make an example with it, it will help others users.


Laurence Muller wrote:
> Hi,
> In the application I am working on, I am trying to create a smooth 
> (transition) animation on the vertices inside an object.
> Example:
> I have included an illustration to make my problem a bit more clear. 
> The current scene contains one geode with a geometry attached.
> The geometry is filled with 7 quads (4 vertices per quad) and is 
> illustrated as red dots in the picture. (The 'edges' are stored in a 
> separate geode)
> The application allows users to select a specific layout (radial, 
> force based, etc) for the quads. In the current implementation this 
> change happens immediately.
> (It updates the vertex array with new values and uses the dirty() call 
> on the vertex array).
> On the OSG wiki page I found some information about animating objects 
> in the scene graph.
> http://www.openscenegraph.org/projects/osg/wiki/Community/NodeKits/osgAnimation 
> http://www.robertpenner.com/easing/easing_demo.html
> However, it seems like this will only work on geode level (by 
> modifying the Matrix or PositionAttitudeTransformation).
> Another problem with this method is that it seems that you need to 
> create a predefined animation.
> In my case the new position of a vertex will depend on the current 
> position (and the animation only needs to be used once).
> Question:
> - Is there a way to use the osgAnimation functions on the vertex array 
> and is it possible to use it with the transition methods from the 
> EaseMotion demo?
> Kind regards,
> - Laurence
> ------------------------------------------
> Laurence Muller
> Website/Blog/Portfolio:
> http://www.multigesture.net/
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+33 (0) 6 63 20 03 56  Cedric Pinson mailto:mornifle at plopbyte.net http://www.plopbyte.net

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