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Iray Emissive lights with invisible props

gibrril_fa945a6ceegibrril_fa945a6cee Posts: 550
in The Commons

Hi all!

I'm trying to light a scene tot render in Iray using emissive surfaces to give me some good lighting. Is there a way to make the emissive props themselves invisible in the render? I find that if I either make their surface cutout opacity value 0.0 or uncheck the "visible in render" property, the lighting also disappears... I would like the lighting to stay, but the prop to be "gone"... Is that possible?

Thanks a lot,

Me

Comments

  • TooncesToonces Posts: 919

    Yes. Set opacity to .001. I recommend ghost lights since this product handles it for you, but it's not hard to do yourself:

    https://direct.daz3d.com/forums/discussion/140701/making-the-light-invisible

    https://www.daz3d.com/forums/discussion/127056/

  • erostewerostew Posts: 237

    Yes it's a quirk of the system that 0.0 doesn't do what you would expect. I usually use .0001.

  • DestinysGardenDestinysGarden Posts: 2,553

    Well, it *shouldn't* work at all even at .001, but a quirk of the system means it does. I've also had luck leaving the opacity set to 1.0 and putting a black map in the cutout opacity channel.

  • erostewerostew Posts: 237
    edited November 2017
    DestinysGarden said:

    Well, it *shouldn't* work at all even at .001, but a quirk of the system means it does. I've also had luck leaving the opacity set to 1.0 and putting a black map in the cutout opacity channel.

    I'm not a scientist but Iray is supposed to be physically based. So something that has a visibility of 1/1000th of a percent (0.001) is likely too transparent for the naked eye (or camera) to perceive. Maybe on the order of a gas I guess? I suppose 0.0 doesn't actually exist in the "physical" world which is why it doesn't work. But that's only a guess :)

     

    Or maybe it's a 10th of a percent I guess. My bad :)

    Post edited by erostew on
  • gibrril_fa945a6ceegibrril_fa945a6cee Posts: 550

    Thanks for the awesome replies!!!!

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