The most notable change in this version is the change in name to Valve Hammer Editor. The following changes have also been made:
Splitter view layout is now preserved from session to session.
Fixed a random spinlock when rendering sprites.
The editor has been given a facelift, with a completely rewritten OpenGL renderer for the 3D views. This enables the addition of engine rendering code for previews of such things as sprites and glow effects. Texturing, normally the most time-consuming aspect of mapmaking, has also been streamlined. And, a number of other productivity-enhancing features have taken the most common hitches out of mapmaking.
OpenGL 3D Renderer.
The real-time renderer is much faster, more robust, and allows for
animating visuals in the 3D view.
Aside from the above highlights, there have been a number of smaller changes as well.
Go To Brush Number.
Brushes can now be found by entity / brush number for fast tracking
down of compiler errors.