Thanks, but it's not what I'm looking for. I'll try to explain it better:
- I already have a smudge tool, what I'm looking for is something that would displace a point, with the surrounding area around a defined radius moved less as it's further from the picking point, much as if the canvas was elastic.
- in a 3D software, it's easy to make a render with what I want to show in white and the rest in black. I'm trying to use this greyscale image as an input to set the opacity of another image, something that works poorly or not at all with threshold based plugins.
hope this helps.