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I am working on a display for car. It has a couple of glossy white walls, floor, and ceiling in a whitish environment.

I am getting a nice look with a physical sky lighting with no sun, however it takes 2 hours to render one out and get rid of the noise. Can anyone suggest a way to speed up the process? I tried skydome without sun and that takes the same time. Thanks.

Steven Houtzager

Can't help you much with the lighting although I've heard IBL lighting is faster than physical sky (however, I've never heard commentary on how low res your IBL needs to be for that to hold true).

You should be careful about using too much white though, it's holds onto noise the longest. At the very least, make sure you aren't using 255 white, go down to somewhere like 220ish.

-Brodie

Brodes is right on both points! You can open studio, set your sky then in the enviroment dialogue save this sky out as a HDRI where it allows you to set the image size to be save - set this low! Then use this in the illumination, reflection and refraction slots and your render should go vrooooommmmm! Though again as Brodes suggests watch your whites!