Moho Forum

It seems smart bone works only with rotation. Is possible to create expression based on source bone Position or Scale?

If you're using the dropdown menu - Bone/Make smart bone dial - you'll have the rotation set and divided automatically but have you tried adding Position or Scale?

Yes, smart bones only work with bone rotation, but you can make rigs to control that rotation using another bone's scale or position.
Here's an example using a scaling bone: https://www.mediafire.com/file/4yu8wpez ... .moho/file

Position control would just be moving the targeted bone in that file, instead of scaling it's parent bone.