Forum: DAZ|Studio


Subject: black render image

goofygrape opened this issue on Jun 23, 2022 ยท 8 posts


RHaseltine posted Sat, 25 June 2022 at 8:53 AM

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.