Blender 2.61 Release Notes
A new Movie Clip editor for loading clips, tracking points and reconstructing motion was added. Constraints can apply this reconstructed motion into the scene, and compositing nodes are available for (un)distorting rendered animations or real footage.
It is still in development, and more production features are planned to be added, this is the first preview release.
This makes many effects possible that were previously difficult to achieve, for example footsteps in the snow, raindrops that make the ground wet, paint that sticks to walls, or objects that gradually freeze.
Ported from the open source Houdini Ocean Toolkit, it is intended to simulate deep ocean waves and foam.
Camera sensor size and presets, improved image saving, 3D mouse color wheel editing, more translations to other languages, node muting improvements, region drawing tweaks, and many more small changes.
The render engine API has been extended for closer integration, a mechanism to detect changes in scenes and persistent callbacks were added, the noise module was updated, and easier access to library datablocks was added, along with various other changes.
New Addons in this release are an Adobe After Effects exporter, Atomic Blender (Protein Data Bank) file importer, Acclaim and C3D motion capture importers, and Nuke camera animation exporter and importer.
180 bugs that existed in previous releases have been fixed.