Hi All, I have just checked in an option -m to osgvolume that attaches a dragger to the volume tile, this allows you to change the portion of the volume that it renders, enabling you to interactively cull away parts you aren't interested in. For now I've enabled the TabBoxDragger, but the technique works just fine with all the draggers - even the TrackballDragger which means it's possible to rotate the volume tile as well as resize.
As part of this work I've refactored the ray tracing GLSL shaders and C++ code to enable the VolumeTile Locator to be decoupled from the ImageLayer Locator, as well as have the inernal TexGen and Transform nodes automatically track changes to the Locator values. This means you can change the values in yourself without the need to rebuilding the VolumeTile's internal scene graph that it uses to do the rendering of the volume. This means the cost of changing the dimensions of the volume which your rendering is now very lightweight and can happily be done at a solid 60Hz (if you card is able to hit that when doing volume rendering ;-). The changes are now checked into OpenSceneGraph svn/trunk and OpenSceneGraph-Data svn/trunk (as the in source and in example data shaders have been updated.) Currently there is a custom DraggerCallback defined in the osgvolume example (called DraggerVolumeTileCallback), but it's my plan to move this directly into osgVolume NodeKit once this dragger functionality has been tested more and it's design settled down. On my plan of action is to try out having multiple draggers attached to single volume tile, and allow the user to interactively switch between then, this may well require some further mods to osgManipulator library. When this functionality is all ready to go I'll roll it into Present3D to allow you to interactively adjust volume rendering live in your 3D stereo presentations ;-) Cheers, Robert. _______________________________________________ osg-users mailing list [email protected] http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
