Add "Fill Layer with Black Mask" option to improve performance and workflow in dense projects

Hi Adobe team,

I’d like to suggest an improvement for Substance 3D Painter that would help greatly with performance and usability in complex projects.

Currently, when you add a new Fill Layer, it is immediately applied across the entire mesh. This triggers material calculations on all visible UDIMs, which can significantly slow down the software—especially in large projects where the layer is only intended to be used in a specific area.

To address this, I suggest either:

1. Adding a secondary button next to the existing "Add Fill Layer" option that creates a Fill Layer with a black mask by default.

2. Or allowing users to define a default Fill Layer behavior in Preferences, including the option to automatically apply a black mask upon creation.

This would prevent unnecessary material evaluations and give artists more control and efficiency, particularly when dealing with complex stacks or heavy assets.

Thanks for your consideration!