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Iray doesn't process lights

DekeDeke Posts: 1,635
in New Users

I'm getting used to usuing Iray with a sun-sky combo, but when I move inside I'm lost. I can get some response from Emmissive surface if their light is really cranked up, but I get no love from added lights. I add a spot light, adjust the position and "photometrics" but I don't see any effects in the scene.  I adjust the render setting to Dome and Scene and still get nothing. Any thoughts?

Comments

  • FishtalesFishtales Posts: 6,162

    Use scene only and adjust the ISO, F/Stop and shutter speed to get more light into the Iray camera. This isn't the camera you are using in the scene. You can also use an HDRI in the Finite Box Dome and lower it to below the height of the ceiling for Ambient light. Make sure the Headlamp is turned off in the camera too.

  • DekeDeke Posts: 1,635

    Thanks. I should mess with the "camera" settings more...rather than just pump up the lumens. What throws me, however, is getting specific lights...like a kicker to rimlit a subject from behind. Or splash some light from the side. It seems the Iray lights are great, but very diffuse and soft.

  • DekeDeke Posts: 1,635

    And another thing...even when I'm in "scene only" for rendering, and I turn out all the scene lights, I still get a soft light on this figure. I would think the figure would be black...with no lights on.  But it still has a flat overall lighting from somewhere. And the camera headlamp is turned off.

  • FishtalesFishtales Posts: 6,162

    You can still use spots in your scenes and use them or turn lights into Emitters. This image is inside with an HDRI on a Finite Box and emitters on the car head and tail lights.

  • FishtalesFishtales Posts: 6,162
    edited July 2015

    This image uses an HDRI in a Finite Box and an ordinary white spot on the left and a red one low and to the right.

    Post edited by Richard Haseltine on
  • DekeDeke Posts: 1,635

    Nice work. I'm still getting a mystery light from somewhere that gives a flat straight on look.

  • DekeDeke Posts: 1,635

    So what is the difference between HDRI, Dome, and Sky. I have this idea that they are basically the same thing....a big invisible sphere that is shining light into the scene.

  • FishtalesFishtales Posts: 6,162

    Did you turn the Headlamp off in the camera?

  • DekeDeke Posts: 1,635

    Yes, headlamp is off. 

  • prixatprixat Posts: 1,590

    There's a headlamp setting in a couple of places. 
    On the camera itself and in render settings, its worth checking them both.

    Think of the Dome as the blank projecting screen that you stick the HDR onto.
    If you want just a sky then there's no need to go and find/make an HDR for it, use the built in Sky instead.

  • DekeDeke Posts: 1,635

    Yes, it's a bit confusing that Iray has a giant invisible sky...somethign to get used to.  Sickleyield has a great tutorial on the basics of lighting and that includes carefully shutting off that pesky headlamp and setting the render side of things to "never." I use Command-L to turn on and off some sort of preview light when a scene is black. What I have problems with is the sort of specific lighting I could do in 3Delight...set a spot, narrow the spread, and light just one item, or rimlight a characters. There's a lot more trial and error so far in Iray as there is less of a connection between the preview and the final render.

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