Autodesk Mud Box – Paint Texture – Masks
1. RIGHT COLUMN> TOP LEFT> ‘Create New Layer’ button> Paint Layer, name it ‘Mask’
2. Paint the layer with black a white
3. RIGHT COLUMN> DRAG AND DROP ‘Mask’ Layer over another layer to convert it into a mask!
It works as Photoshop: black= opacity 0% / white= opacity 100% / nostrokes= opacity 100%