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Couple of questions about Iray lighting

SnowSultanSnowSultan Posts: 3,785
in The Commons

I'm pretty sure I already know the answer to these questions, but I just want to conform. I often forget stuff I've already learned (and even stuff I've written tutorials on).  :)

- There's no way to add distance falloff to an Iray spotlight, correct? Ray Length only affects the light guide.

- Is there a way to designate what objects are illuminated by a particular light, or do you still have to render twice (once with the light off) and do it in postwork?

 

Thanks in advance.

Comments

  • fastbike1fastbike1 Posts: 4,078

    Iray lights fall off according to physics. Ask yourself how lights behave in real life. That’s how Iray lights will behave.

  • JonnyRayJonnyRay Posts: 1,744
    edited July 2018
    SnowSultan said:

    I'm pretty sure I already know the answer to these questions, but I just want to conform. I often forget stuff I've already learned (and even stuff I've written tutorials on).  :)

    - There's no way to add distance falloff to an Iray spotlight, correct? Ray Length only affects the light guide.

    - Is there a way to designate what objects are illuminated by a particular light, or do you still have to render twice (once with the light off) and do it in postwork?

     

    Thanks in advance.

    Unfortunately in this case you're running into two things dealing with physically based engines like Iray. They don't like you messing with how light works. Light of a certain intensity has a defined falloff distance. You can change the geometry of the emitter and adjust the intensity values and such, but you can't do like we did in 3Delight and define a cutoff distance beyone which the light won't affect the object. Likewise the tagging of lights to objects / surfaces isn't possible because you can't tell a lamp in the real world to shine on the person, but not on the couch they're sitting on..

    Post edited by JonnyRay on
  • SnowSultanSnowSultan Posts: 3,785
    edited July 2018

    Thanks, that's what I thought. There's lot of advantages to physically-accurate lighting, but not so much for fantasy artists and those who need more flexibility and creative freedom.

    Post edited by SnowSultan on
  • Sven DullahSven Dullah Posts: 7,621
    SnowSultan said:

    Thanks, that's what I thought. There's lot of advantages to physically-accurate lighting, but not so much for fantasy artists and those who need more flexibility and creative freedom.

    That's why I prefer 3DLwink

  • dracorndracorn Posts: 2,363

    I love the way 3DL handles low light / dramatic shadows so well.  Lighting is just easier in 3DL.  

  • JazzyBearJazzyBear Posts: 805

    https://www.daz3d.com/iray-ghost-light-kit

    https://www.daz3d.com/iray-ghost-light-kit-2

    Best stuff ever! We okay waking up alive each day is better and ... LOL! Well anyway those should help a lot. I know they do for me.

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