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Iray Camera headlamp issues

CMKook-24601CMKook-24601 Posts: 200
in Technical Help (nuts n bolts)

So I have noticed that some times when a camera gets too clos to an object it causes alot of glare but shutting it off doesn't help as it can cause the scene to go dark... any solutions?

Comments

  • Richard HaseltineRichard Haseltine Posts: 100,842

    Do you have any other light sources (that can get to the render area - an HDR environment map won't help in a closed room).

  • CMKook-24601CMKook-24601 Posts: 200
    Richard Haseltine said:

    Do you have any other light sources (that can get to the render area - an HDR environment map won't help in a closed room).

    yeah several mesh lights, but they only seem to help so much, and even then if I leave the camera's lamp on it causes the area that it it pointed at to be washed out alot. The only thing that has made it better was increasing the brightness of the mesh lights and turning off the camera's lamp. So, it takes care of the glare/ washout issue but leaves me with a scene that is a bit dimmer than I'd like. Maybe some off camera light boxes?

     

  • fastbike1fastbike1 Posts: 4,077
    edited October 2015

    If the scene is too dim, your choices are basically more lights or more output from the existing lights.

    One generally always wants the lights off camera. Kind of the difference between a flash on your camera shooting straight at the subject and  the flash off to the side bouncing off a surface. Much better, softer light and shadows from the bounced light.

    Post edited by fastbike1 on
  • ToborTobor Posts: 2,300

    If you like the overall appearance of the camera headlamp-- it can create a kind of "flash fill" look -- you can keep using it if you want. You can change its offset from the camera, and alter its intensity if it gets too bright. It's basically a light parented to a camera, but you're not stuck with one brightness setting or position.

    If you'd prefer to simply turn the headlamp off, you can make the scene brighter by increasing the meshes even more, or by adjusting the Tone Mapping. Just halving the shutter speed from 128 to 64 lets in twice as much light.

    Just keep in mind that Iray works by calculating paths between camera and light(s). The more of these paths, ideally from not *too* many separate sources, the better. It helps render scenes faster, with less of the salt-and-pepper grain. You generally get faster rendering if you increase the brightness of your lights, rather than only tweaking the Tone Mapping settings. The latter is best for fine-tune adjustments.

  • CMKook-24601CMKook-24601 Posts: 200
    fastbike1 said:

    If the scene is too dim, your choices are basically more lights or more output from the existing lights.

    One generally always wants the lights off camera. Kind of the difference between a flash on your camera shooting straight at the subject and  the flash off to the side bouncing off a surface. Much better, softer light and shadows friom the bounced light.

    Thank you

     

    Tobor said:

    If you like the overall appearance of the camera headlamp-- it can create a kind of "flash fill" look -- you can keep using it if you want. You can change its offset from the camera, and alter its intensity if it gets too bright. It's basically a light parented to a camera, but you're not stuck with one brightness setting or position.

    If you'd prefer to simply turn the headlamp off, you can make the scene brighter by increasing the meshes even more, or by adjusting the Tone Mapping. Just halving the shutter speed from 128 to 64 lets in twice as much light.

    Just keep in mind that Iray works by calculating paths between camera and light(s). The more of these paths, ideally from not *too* many separate sources, the better. It helps render scenes faster, with less of the salt-and-pepper grain. You generally get faster rendering if you increase the brightness of your lights, rather than only tweaking the Tone Mapping settings. The latter is best for fine-tune adjustments.

    and thank you for this, it helped alot pretty much  solved the problem

  • warrenaowarrenao Posts: 61

    Couple of things that might be worth trying. I'm assuming space is tight in the area you're using the headlight in, or you'd have more conventional lighting in place instead.

    1. Change the intensity of the light in the camera settings. You'll need to fiddle a bit.

    2. Change the x,y,z offset of the light to see if it provides a more even or naturalistic illumination without drifting too far from the camera. Changing the offset, particularly in concert with changing the intensity, might get you what you need.

    If those options don't work, consider using the camera as a parent for a light or set of lights that provide you with mobile, acceptable illumination.

  • geoff6geoff6 Posts: 250

    Primitive emitters (torus or cylinder flattened to a disc) instead of headlamps and mesh lights. It's a great asset to use and definately reduces render times imo. Parent one to the camera instead of the headlamp then mess around with the film speed (ISO) in Tone Mapping.

    G

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