interpBlendShape is a custom Maya deformer, similar in purpose to Maya’s built-in blendShape deformer, but with surface UV interpolation, in-between support, and Bezier-style blending instead of traditional linear interpolation. It supports both meshes and curves.
The tool is designed for high-end facial rigging and special deformation cases where you want the deformation to slide across a surface while keeping the result smooth, clean, and controllable. In some cases, it can also help achieve a more graphic or 2D-style deformation look.
One of the most common challenges in facial rigging is handling large mouth shapes. Traditional linear blendShape interpolation can often produce unpleasant or unnatural in-betweens. With surface-based blending, you can focus mainly on sculpting the final target shape, while the in-between motion slides across the NURBS surface or mesh surface you provide.
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