A major update to the Source SDK has been released on Steam. Included in this update are several features and fixes for the tools in the Source SDK.

New SDK Features

• High Dynamic Range lighting now supported in the tools


• Day of Defeat: Source support now included


• New Hammer Editor features:


• VGUI Model browser with real-time 3D view


• Map autosave/backup


• Model and displacement rendering in 2D views


• Many other small improvements and bug fixes

For a full list of changes, see the Source SDK Changelist on the Valve Developer Community site