I'm trying to render a frame, with realistic depth of field effect. I've already tried the depth of field properties in the camera node, but it doesn't produce usable results.
Is there a switch to max-out rendering quality of the depth of field effect? Performance is not a factor, I just need to render a frame, and user can wait for it.
SceneKit isn't able to do (out of the box) heavy, high quality post processing or still image rendering computation of this type. Theoretically you could probably build a setup that uses its rendering approaches to do both. But it's not a high quality renderer. If the user can wait, and you really want to focus on quality of imagery, Unreal Engine has the capacity to do this sort of thing, built in, and far higher quality post processing, effects, lights, materials, particles and rendering.