About the support for Mac models
Cubism Editor is not supported with Apple M1 processors.
Please refer to System Requirements
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Culling is an option for the reverse side of a layer, allowing for an "Invert Culling" option to cull the front of an object instead would make flipping certain objects easier as the art can be drawn more accurately.
The current method requires flipping the art in the PSD, and manually flipping the art mesh in Live2D to reverse it, and trying to line it up with the object. This works alright with playing cards for example, but any more complicated shape than a box becomes difficult to draw and rig.