Bounded Biharmonic Weights: 2D MATLAB Demo

Alec Jacobson

July 11, 2011

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I've finally released the matlab prototyping codebase for Bounded Biharmonic Weights. The code base runs without any prerequisite libraries on MATLAB 2011a or greater. With earlier versions of matlab, users should install MOSEK (which is available for free to academic users). This matlab package demos computing skinning weights automatically for a 2d shape. To start, add bbw_demo/ to your matlab path and issue:

>> bbw_demo

If you just want to start digging around in the weight computation code, look at:

• boundary_conditions.m
• biharmonic_bounded.m

Currently the bbw_demo.m file just shows basic weight computation and linear blend skinning deformation for point handles. The following features are supported in the codebase above, but are undocumented besides their file header comments:

• Bone handles
• Cage edges
• Dual quaternion skinning
• Automatic rotations at point handles via pseudo-edges
• 3D weight computation over tetrahedral meshes
• 2D/3D remeshing along bones and cage edges
• ...and more

The following things are not supported and probably never will be in the MATLAB demo. If I release the C++ demo then of course they will be available:

• 3D interactive deformation
• 2D texture mapping

Please contact me if you find any bugs or have any trouble using the code.

Update: Here's a new C++ demo