I don’t know enough about cycles yet to know if my questions are possible or not so I’m looking for advice.
When I set cycles to render I am making an educated guess as to how many passes are required to get a relatively clean image. If I set cycles to render with 500 passes, for example, and I find when the rendering is done that more passes are required is it possible to “add” more passes? Is the image held in a buffer that would allow the rendering to continue if required?
Secondly is it possible to save a cycles rendered image at user determined intervals? For example if I want to set a test image to render overnight at 10000 passes is it possible to have Blender/Cycles save a progress rendering at intervals of say 500 passes, so in the morning I could look back over the saved images and see at what point the image was acceptable? That way I would know what settings to use for future renderings of the scene.