@Sidney Eliot Generally speaking, these shadow issues are fundamental to all renderers, not specific to Toolbag. There are some tricks that can be done in raster rendering engines to soften shadow faceting somewhat, but as you note in the last part of your post it's a problem there too. The software can only render shadows…
Just wanted to add my own experience with this issue: I'm still in the process of finding out best practices in regard to this issue and will keep this post updated when I find out new things. Btw, the official term for this problem is "Shadow Terminator Atrifact". --- Adding sub-division level in Marmoset This solution is…