Seems like viewing object space normal maps in marmoset already works ok, so it would be really nice to get the option to paint/edit them in the painting tools. Doesn't seem like there's anyway to do that currently unless I'm missing something. At least not in a way were you can get a live preview of their effect.
hand painting object space normals for stylization purposes is a thing people have been playing around with semi recently. It makes for a really cool effect. But as far as I can figure out neither marmoset nor substance painter actually support it in a way that also previews the normal map result. Seems only blender can do…