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Iray Emissive Surfaces Issue

jeffbdvsjeffbdvs Posts: 32
edited January 8 in Technical Help (nuts n bolts)

Setup goes well, no problems there. Color and intensity of the emitted light is correct, too. But the color of the emissive surface itself is blown out to white. How do I get the streetlamps in the attached screenshot to appear bright yellow instead of bright white, please?

IrayEmissionIssue.jpg
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Post edited by jeffbdvs on

Comments

  • FishtalesFishtales Posts: 6,156

    Turn the Luminance value down and use Tone Mapping to light the scene.

  • jeffbdvsjeffbdvs Posts: 32
    edited January 8

    Fishtales said:

    Turn the Luminance value down and use Tone Mapping to light the scene.

    Oddly enough, I read your recommendation to try that in another thread from long ago! I tried it and when the f-stop and shutter speed were set to let in as much light as I got using the Emission settings above, the emissive surfaces had the same blown-out look. 

    That said, I'll try again and see if maybe I missed other Tone Mapping parameters that might help get the look I want. I'll post some screenshots. Thanks!

     

     

    Post edited by jeffbdvs on
  • jeffbdvsjeffbdvs Posts: 32
    edited January 8

    jeffbdvs said:

    That said, I'll try again and see if maybe I missed other Tone Mapping parameters that might help get the look I want. I'll post some screenshots. Thanks!

    Attached. I lowered the Luminance value to one that gave me the bright yellow look that I want from the lamps. When I tone-mapped with that luminance value set, I got the result shown.

    Please let me know if you spot something I've done wrong. Cheers.

    EmissionSettingsChange01.jpeg
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    EmissionSettingsChange02.jpeg
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    Post edited by jeffbdvs on
  • crosswindcrosswind Posts: 7,744

    Not sure if there's a bulb or light geometry within the lamps, but Luminance value 50 with Luminance Unit kcd/m^2 seems still high, try further reducing the value.

    Also reduce Burn Highlight in Tone Mapping and crank up Crush Blacks. See if it's improved.

  • FishtalesFishtales Posts: 6,156

    crosswind said:

    Not sure if there's a bulb or light geometry within the lamps, but Luminance value 50 with Luminance Unit kcd/m^2 seems still high, try further reducing the value.

    Also reduce Burn Highlight in Tone Mapping and crank up Crush Blacks. See if it's improved.

     

    I prefer to use the bulb, if there is one, rather than the glass of a lamp. Also I use cd/cm² because I find it easier to control :) In Tone Mapping you can use the ISO setting, the higher the setting the more light that gets into the lens. For that street I would have ISO 400 or higher, F/stop 6 or lower and shutter speed 60 or lower and then drop the lumens, even down to single figures if needed.

  • jeffbdvsjeffbdvs Posts: 32
    edited January 9

    Thank you, guys. I'll experiment with your settings to see if I can improve things.

    The emissive lamp glass started out as a shortcut so I wouldn't have to put bulbs in each lamp, thereby saving me some work. Ironic, isn't it? laugh

    Post edited by jeffbdvs on
  • FishtalesFishtales Posts: 6,156
    edited January 9

    jeffbdvs said:

    Thank you, guys. I'll experiment with your settings to see if I can improve things.

    The emissive lamp glass started out as a shortcut so I wouldn't have to put bulbs in each lamp, thereby saving me some work. Ironic, isn't it? laugh

     

    Zoom in to the lamp and see if there is already a bulb or something inside that you can make Emissive and use that. Make sure you make the glass clear so the light shines through. 

    Post edited by Fishtales on
  • FishtalesFishtales Posts: 6,156
    edited January 9

    I zoomed in and there is a bulb inside unfortunately it is part of the glass. I used the Geometry Tool to select it and made a Region and a Surface for each bulb and made them Emissive then saved them as a Prop.

    Click on image for full size.

     

     

    le-village-lights-001.jpg
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    Post edited by Fishtales on
  • crosswindcrosswind Posts: 7,744

    Me too. I always prefer to using a bulb or a separate geometry if there's any... to emit the light. Or place one there if there's nothing inside.

  • jeffbdvsjeffbdvs Posts: 32
    edited January 10

    Fishtales said:

    I zoomed in and there is a bulb inside unfortunately it is part of the glass. I used the Geometry Tool to select it and made a Region and a Surface for each bulb and made them Emissive then saved them as a Prop.

    Click on image for full size.

     

     

    Very, very nice! Top effort. 

    I went a different route and left the bulbs alone, instead adding sphere lights of the correct color and temperature inside the fixtures. I like the look of your fixtures, but I like the color and throw of my sphere lights. What do you think? It's called "The Day Begins"

     

    The Day Begins.png
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    Post edited by jeffbdvs on
  • FishtalesFishtales Posts: 6,156

    Very nice. It doesn't really matter how you do it as long as it works and you are happy with it.

  • jeffbdvsjeffbdvs Posts: 32

    Thank you again for helping me with this. And for taking the extra time to make those new light props. They do look good!

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