Re: [Opensg-users] TrackballNavigator oddities

[Andreas Z. <am...@gm...>]

Hi Terry,

> I noticed that the TrackballNavigator zooms in and out much faster on
> my Windows machine than on my Linux machine.  Does anybody know why,
> and would this be something that is easily fixed?

hmm can't believe this one it only depends on the scene size.

> Also, if models are very large, it seems to take a long time to zoom
> in and out of them.  Is there a way to scale the zooming speed?  I
> spotted a setTranslationScale() function in the deprecated Trackball
> class, which sounds similar to what I'm looking for.  Translation in X
> and Y is handled intelligently in TrackballNavigator and probably
> doesn't need to be scaled in most cases, but zooming (translation in
> Z) is a different story.

The navigator class has a setMotionFactor() method if you use the 
TrackballNavigator directly you can do something like this:

Real32 distance = osgSgn(toY-fromY)* 100.f * osgpow(osgabs(toY-fromY),2.f);
_trackball.translateZ(distance * _rMotionFactor);

and the _rMotionFactor should depend on your scene bounding box size.

Andreas

> --
> Terry Welsh - mogumbo 'at' gmail.com
> www.reallyslick.com  |  www.infiscape.com  |  www.vrsource.org
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