Add RBF solver for joint driving #9860
Description
Describe the project you are working on
Complex character rig for games (and I want to use it in Godot)
Describe the problem or limitation you are having in your project
Character deformation quality is too limited with usual game skeleton. Proper topology and weights is only a partial solution.
It's possible to do nice deformations in Blender or Maya (using helper joints with RBF plugin), but need a way to transfer it to game engine (for IK, ragdoll, procedural anims etc.)
Describe the feature / enhancement and how it helps to overcome the problem or limitation
RBF (Radial Basis Function) solver can effectively interpolate an arbitrary number of values based on any number of poses.
A common application for a RBF solver is the blending of corrective shapes/joints or blend shapes in general, especially when it comes to problematic areas like the shoulder, wrist or hip area.
RBF solver is used in UE5 (Metahuman), Cyberpunk 2077, God of War Ragnarok, Tekken 8, Final Fantasy XVI.
Describe how your proposal will work, with code, pseudo-code, mock-ups, and/or diagrams
There are several open source RBF implementations for DCC apps.
For example, weightDriver for Maya and RBF Nodes for Blender. Both under MIT license.
Github links: weightDriver, RBF Nodes
If this enhancement will not be used often, can it be worked around with a few lines of script?
Nope
Is there a reason why this should be core and not an add-on in the asset library?
RBF solver could be very important for high quality character animation, so I think it should be a core feature.