You set up a scene with whatever let's say a figure, render the image boom a black render, or at the least nothing shows.

I'm doing something wrong, this has never happened made a long time ago no dought, with the newest studio install.

goofygrape

I have yet to install the latest version of DAZ because it apparently blows up mesh light settings. All my renders in iray use some sort of invisible meshlight so I don't want to install the new version. Are you using meshlights?

COBBLER3D; I'm not using mesh lights, but you are right any light introduced bows up no control. Still blank renders.

Thanks for your answer as I guess I've been the only one in Daz history that has had this problem :)

goofygrape

Ok now the fix is in, don't install 4.20 studio. It has a lighting issue other wise you will have to fix things, luminance value needs x100 up date at the least. when I looked at Daz forums a lot of complaints were about this type of problem.  So roll back to 4.16 and tell the fixing is done!

goofygrape

This is the change in emissive lights with opacity less than 100% - an iray change. Now if a surface emits light the luminance is multiplied by the opacity, so ghost lights (emissive planes usually, with a very low opacity) lose much of their power and many flame props and similar (usually geometry with an opacity map making the non-flame areas wholly transparent with the flame part partially transparent) lose power in proportion to the area that is not opaque. Your senes presumably use some of those for at least part of their lighting. As discussed on the froum, there are ways to ameliorate the issue (including upping the luminance) but it seems that nVidia is going to keep the change (on the grounds that it reflects reality - low-opacity items don't emit light) though it would be nice if they made the behaviour toggleable.

RHaseltine; yes you are so right on the nose thanks for all the info you have given me over time. I went back to 4.16 and all is well :)

I'm a bit later for that thread but I experienced the same problem very recently. The final fix was to lower the render subd for my figure, which was okay since this wasn't a close-up. No more black renders after that.

simontemplar; thanks but I went back to 4.16 and everything is back to normal hahaha, by the way, the name is so cool :)