Blender - is the open source software for 3D modeling, animation, rendering, post-production, interactive creation and playback. Available for all major operating systems under the GNU General Public License. The Blender installer is only 8 Mb and only requires 27 Mb after installation, whereas software like AutoCAD requires around 2 Gb. As such, Blender can be easily downloaded (although some guide books still include Blender on a CD).

Blender features:

• Volutionary non-overlapping and non-blocking UI delivers unsurpassed workflow
• Flexible and fully configurable window layout
• Video sequence editing, and character animation action editor
• Built-in text editor for annotations and editing Python scripts
• Consistent interface across all platforms
• A range of 3D object types including polygon meshes, and NURBS surfaces
• bezier and B-spline curves, metaballs, vector fonts
• Smooth proxy' style catmull-clark subdivision surfaces
• Armature (skeleton) deformation with forward/inverse kinematics
• Auto skinning and interactive 3D paint for vertex weighting
• N-linear animation mixer with automated walkcycles along paths
• Vertex key framing for morphing with controlling sliders

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