Blender is a free, open-source, 3D studio for animation, modeling, rendering, and texturing offering a feature set comparable to commercial 3D animation suites. It includes features such as multi-resolution sculpting; retopology painting and it has 3D view texture painting; stack based modifier system; flexible particle system with particle based hair; cloth/soft body dynamics, rigid body dynamics and fluid simulation; node based texturing and node based compositing; an integrated non linear video editor; and integrated game engine. Blender is developed under the GPL and is available on all major platforms including Windows, OS X, Linux, BSD, Sun and Irix.