Any tips on rendering at night or in the dark?
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Yikes. My own experience with the attempts that I have made have been hit-or-miss. Mostly misses. The dilemna, as you may be well aware, is that when it gets dark, you can't really see. In a dark room without a light source you can't see anything. Its pitch black. Outside, there is sometimes at least some ambient light, from the moon or stars, etc. but detail is often limited and colours tend to fade to grayscale. That's the real world. The best advice that I can give is to resort to trickery. That is rather counterintuitive when it comes to using a render engine like Iray that is supposed to give realistic lighting. 3Delight has far more tricks up its sleeve and can be more conducive for that. Iray definitely does not like low light conditions and can take forever to resolve. But creating credible nightime or dark scenes is still tough no matter what render engine you use. I can't offer you a foolproof formula for doing so, since I haven't found it yet, myself. However, I can suggest that you try taking a page from the filmakers book. Filmakers have long had to deal with a similar dilemna, and have "solved" the issue by lighting their scenes to show an acceptable amount of detail, then darkening them to taste in post production. You could try and experiment with doing so by lighting your renders as much as necessary and darkening them in an image editor afterwards. Starting with a relatively well-lit scene and darkening it in postwork is probably going to be easier that attempting to lighten a poorly lit scene in postwork.
Perhaps someone will happen by that does have a magic formula for you.
Good tutorial here: https://www.daz3d.com/forums/discussion/250541/tutorial-shooting-day-for-night
Thanks for the wisdom!
Here's what your looking for:
:D