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Help wanted with Window Lights

sueyasueya Posts: 867
edited September 3 in The Commons

I have just added Iray window lights

to this scene. As you can see I can't see the scene behind the window. Please can someone advise me as to how I can get it to show up. This scene is 80% rendered but I would expect the background to show up by now.

Post edited by sueya on

Comments

  • garrett_3dgarrett_3d Posts: 986

    Looks like the emission value is way too high so it's washing out the window.

  • FishtalesFishtales Posts: 6,233
    edited September 4

    Also check your ToneMapping settings.

    Post edited by Fishtales on
  • jmucchiellojmucchiello Posts: 2,312

    sueya said:

    I have just added Iray window lights

    to this scene. As you can see I can't see the scene behind the window. Please can someone advise me as to how I can get it to show up. This scene is 80% rendered but I would expect the background to show up by now.

    I just want to point out that once a pixel is white, it will never be anything else but white. So as soon as you saw the large white blob in the window, the background was never going to show up. IRAY is entirely addative. Nothing is going to subtract light from the image.

    Also check the Environment Map and Environment Intensity settings in Environment. The default to 2.0 and 1.0 by default. But I find a lot of HDRIs are overly bright. Map determines the brightness of the HDRI image and Intensity the brightness of the light cast by the HDRI. 

    Someone mentioned tonemapping. I would start with the environment. Changing f-stop or exposure has other effects. But the environment settings are like changing the luminosity of an emissive surface.

  • Richard HaseltineRichard Haseltine Posts: 111,666

    jmucchiello said:

    sueya said:

    I have just added Iray window lights

    to this scene. As you can see I can't see the scene behind the window. Please can someone advise me as to how I can get it to show up. This scene is 80% rendered but I would expect the background to show up by now.

    I just want to point out that once a pixel is white, it will never be anything else but white. So as soon as you saw the large white blob in the window, the background was never going to show up. IRAY is entirely addative. Nothing is going to subtract light from the image.

    Iray does work with a higher bit-depth internally, which a Beauty Pass canvas can capture, so it may be possible to get detail from a pixel that is white in an 8 bit image.

    Also check the Environment Map and Environment Intensity settings in Environment. The default to 2.0 and 1.0 by default. But I find a lot of HDRIs are overly bright. Map determines the brightness of the HDRI image and Intensity the brightness of the light cast by the HDRI. 

    In the Window Lights the light itself is meant to be providing the environment light, and is emissive to do so. The idea of the product is to be more efficient than a wrap-around HDRI when there is only one aperture for the light to coem through (though I ray does somewhat optimise this itself)

    Someone mentioned tonemapping. I would start with the environment. Changing f-stop or exposure has other effects. But the environment settings are like changing the luminosity of an emissive surface.

    Changing ISO, f-stop, or shutter speed has no effect beyond tone - these are not physical cameras where each option has other effects too.

  • jmucchiellojmucchiello Posts: 2,312

    Richard Haseltine said:

    jmucchiello said:

    I just want to point out that once a pixel is white, it will never be anything else but white. So as soon as you saw the large white blob in the window, the background was never going to show up. IRAY is entirely addative. Nothing is going to subtract light from the image.

    Iray does work with a higher bit-depth internally, which a Beauty Pass canvas can capture, so it may be possible to get detail from a pixel that is white in an 8 bit image.

    That doesn't change the image OP posted. Once that preview image showed white, it wasn't changing. I don't think canvases were in use here. Did I miss where the said they were posting a Beauty canvas?

    Also check the Environment Map and Environment Intensity settings in Environment. The default to 2.0 and 1.0 by default. But I find a lot of HDRIs are overly bright. Map determines the brightness of the HDRI image and Intensity the brightness of the light cast by the HDRI. 

    In the Window Lights the light itself is meant to be providing the environment light, and is emissive to do so. The idea of the product is to be more efficient than a wrap-around HDRI when there is only one aperture for the light to coem through (though I ray does somewhat optimise this itself)

    I don't own the product. I just assumed it was HDRI. If it's an emissive, they can change the luminosity in the surfaces tab. https://www.daz3d.com/iray-light-manager-pro Is also worth investing in.

    Someone mentioned tonemapping. I would start with the environment. Changing f-stop or exposure has other effects. But the environment settings are like changing the luminosity of an emissive surface.

    Changing ISO, f-stop, or shutter speed has no effect beyond tone - these are not physical cameras where each option has other effects too.

    These modify Exposure and thus they affect the point where the internal 16-bit image is converted to 8-bit.

    For example, by default Exposure is 13 and ISO is 100. Set ISO to 200 and Exposure becomes 14.

  • sueyasueya Posts: 867
    edited September 6

     I decided to reload the window background and lights. The default version looks much better. I also opened the door a little to add more light.

    I also increased the spread angle of the spot light.

    CondoRoomWindowsmall.jpg
    800 x 550 - 580K
    Post edited by sueya on
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