Hello,
I’m trying to prepare maps on object to export it and use with ornatrix. To do this I need some black and white maps. My vision it would be that object will be painted with gradient from white to black. I would prefer to to this by picking two points on object and to apply polypaint gradient to this place. Is it possible to do in some way ? Or just manual tablet “gradient” by hand is option ?
Apply a gradient alpha to the brush, and switch to a drag rect stroke type?
Likewise, the Lazy Mouse> Backtrack stroke option provides a way to pick two points, and brush a stroke between them. Some combination of brush settings here may suit you.
There is also alwaysZApp link. If you cant get the effect you want with 3d brushes, just use the 2d gradient tools or brushes in a 2d image editor like Photoshop.
thanks Spyndel, helpfull as always 
“curvestandard” brush also do quite well.