Sounds more like an algorithm solution than an osg solution.
The below algo isn't perfect, but it'll give you an idea.
finger1=false;
finger2=false;
while(checkForFingerPressRelease)
{
if (finger1pressed) finger1=true;
if (finger2pressed) finger2=true;
if (finger1released) finger1=false;
if (finger2released) finger2=false;
if (finger1 && finger2)
{
check for dragging of finger2 and rotate
else
check for dragging of finger1 and rotate
}
}//while
------------------
Read this topic online here:
http://forum.openscenegraph.org/viewtopic.php?p=48265#48265
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