IPR (available in 3ds Max, Maya, SketchUp, SketchUp(viewport) Rhino, Revit) is a handy tool for scene debugging.
In such cases follow the bullet points individually and track which one resolves the Note: the changes mentioned above might prevent the issue from reproducing. Use Bucket Sampler with Min/Max subdivs of 1 ĭisable global features like GI, Displacement, Subdivision and etc. Use small image resolution or a region render
Tweak Render Settings for faster rendering: