Merge Images To Grayscale: Select 3 images on the shader editor, and press the Merge button in the Mustard Tools tab
Troubleshooting
When I use the IK Spline, the controllers are generated far from the actual curve.
When this happens, also a warning message should appear, remembering you to Apply the location to your armature. To do so, go in Object moe, select the Armature and press Ctrl+A. Then choose Location (even if, in general, applying the full LocRotSca is a good practice).
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