This extension provides the ability to replace the single modelview transformation with a set of n vertex units. Each unit has its own modelview transform matrix. For each unit, there is a current weight associated with the vertex. When this extension is enabled, the vertices are transformed by the modelview matrices of all of the enabled units.
Next, these results are scaled by the weights for the respective units and then summed to create the eye-space vertex. This is commonly used for smooth skinned character animation.
For more details, consult the ARB_vertex_blend spec
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