While rendering a mesh with smooth shading on, I get a dark region/shadow on certain faces. The effect is more evident when smooth shading is applied to a mesh containing ngons, with the ngons turning black when rendered. The blackening effect is visible in the viewport too. How can I solve th...

There are many, many unanswered questions asking if features exist or if certain behaviors are possible. For cases where features don't (yet) exist, but have plans to add them or such promising information, I'll add a comment. If there is a working patch or some way to get the desired behavior/r...