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I've been working on a kitchen project in the last few days and thought I'd show a WIP. The counters are just placeholders for now. The lights are giving me no end of trouble, especially the small ceiling lights around the perimeter. They're Maxwell emitter materials on a hemisphere, and casting light which I can adjust in multilight, but the hemispheres themselves are rendering black. This is a new development; they were rendering properly yesterday. They render properly in Fire, but not when I do a render. It makes no sense to me.

Any ideas would be appreciated.

Walter

i had the same problem several times exporting from sketchup (mxw v2.5)...

i don't remember how i fixed it... i think i rebuild the black objects, but i'm not sure.
Are you using a hdri in addition to the interior lights?!? I think it was related to this combination

Hi, just in case check if somehow the hemisphere´s normals got inverted.

Out of curiosity, why are you using hemisphere as light sources? less polygons (simple plane) are better and render faster.

Cheers
JC

Is it still reproducible if you reduce the scene to just walls and one or two lights? If so, could you send the reduced file (jeremy at nextlimit dotcom)?

Thanks for your replies.

The hemisphere is a primitive sphere with hemisphere set as "type", so I can't reverse the normals on it. I'm using an HDRI I created in Vue for the exterior, for illumination as well as something that will show through the windows. For that I'll need to have another look at my glass material since it's not working out so well either.

I was using the hemispheres with an emitter because I wanted the lights to appear illuminated, but you're right about the render time, so I'll have to rethink this as well.

JD Hill, I stripped down the scene to send it to you and I have another interesting twist to it as a result. The result is similar to before, except that now they no longer respond to adjustments I make using multilight. I'm sending the file so you can have a look at it. Thanks for your help.

Is it obvious that I'm fairly new to Maxwell?

Walter

Thanks for sending the file -- could you try disabling color multilight and let me know if doing so avoids the issue? It looks here like everything works as expected when multilight is either disabled, or set to intensity mode.

I set multilight to intensity only and it's working perfectly. As an added bonus it seems to be rendering faster.

Thanks very much for your help!

Walter

Thanks for confirming, I'll reduce this down to the simplest case and send it along to the core developers.