In facial rigging, corrective blend shapes can become very tedious and time consuming process. Sometimes it take more effort to arrange and connect blend shapes than actually sculpting them. So wrote a script for standardizing and making process easier.
Limitations :In current script target geometry should not have any outputs. Still working by disconnecting outputs before creating or editing shapes need. Also being able to create corrective for more than two target shapes would be better. Finally, for mid weights correctives will be applied in future version.
Demo: from 4.25 to 5.20
How it works
1-select base geometry with one blendshape node
3-select first bsSource
4-select second bsSource
5-press create/edit button for pose correction,