OpenGL

Major changes

Reorganization of scene rendering in TGLViewer - render opaque objects from all scenes first, then all transparent ones.
Modularization of input event-handling in TGLViewer: all event-handling is done by the TGLEventHandler class. One can sub-class it now and modify behaviour of a given viewer. For example, see TEveLegoEventHandler.
Support highlighting of physical shapes for providing feedback and showing selection.

Minor changes, fixes and improvements

Improve saving of images from the GL-viewer so that the dialog boxes and other windows do not result in black areas on the saved image. The window must still be fully contained within the desktop.
Improved camera controls. Three new orthographic cameras have been added to TGLViewer, looking at the scene from another side than the one present so far.
Improved FTGL font management across rendering contexts and text rendering support.
New class TGLAxisPainter that can render 2D and 3D axes via GL. For example see tutorials/eve/cms_calo.C.

Possible performance issues with ATI drivers (fglrx)

In late 2007 ATI switched to a new driver architecture. With these drivers a significant degradation of GL performance in selection mode, up to a factor of 50, was observed. Both linux and Windows drivers were affected. The issue has been resolved in the latest driver versions.

Eve

Major changes

Support for multiple, parallel OpenGL views that can show different projections of the same event.
Provide object selection and feedback highlight across all GL-views and list-trees.
New classes for visualization of calorimeter data, TEveCaloXYZ, see tutorials/eve/cms_calo.C. Available representations: 3D-cylindrical view, projected views r-phi and rho-z, and lego-view (with dedicated event handler allowing detailed inspection of the data).
Support for compound objects in view of selection, highlight and color managament (see class TEveCompound).
Optimize updates of GL-scenes by introducing change-stamping bits into TEveElement. See methods AddStamp() and StampXyzz().
Added support for central management of visualization parameters of objects. Instead of specifying visual attributes individually by set-methods a single string tag can be used to retrieve all of them with a single command, e.g., track->ApplyVizTag("MuonTrack"). The parameter-database can be saved as a CINT script, edited manually and loaded. This provides more flexibility as different users can share the same code to instantiate visualziation objects but still override visualization parameters independently. See TEveElement::CopyVizParams() and TEveManager::*VizDB() methods for more information.

Minor changes, fixes and improvements

Improved handling of projected elements.
For fish-eye projections, allow fixing of compression scale beyond given distance from the center.
Add support for step-function scaling of 2D-projections. This allows arbitrary magnification of concentric regions in r-phi and rho-z views. See tutorial tutorials/eve/projection_test_prescale.C.
Path-mark type representing 2D clusters was added for TEveTrack and TEveTrackPropagator classes.
Add support for representing a set of arbitrary cones to TEveBoxSet (see tutorials/eve/cone_test.C).
TEveFrameBox now supports arbitrary 2d frame shapes - user specifies individual points via SetQuadByPoints() function. See tutorials/eve/quad_test.C::quad_test_circ() for an example.
Consolidation of existing classes and code.