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Iray and the Single Light Source

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  • SzarkSzark Posts: 10,634
    edited July 2015

    Fishtales said:
    dhmohr

    Why does she have a face on her posterior ;-)


    because she is happy, like a room without a roof.
    Post edited by Szark on
  • tl155180tl155180 Posts: 994
    edited July 2015

    dhmohr said:

    Yes, the sun is the only light source for this one. But there are at least 2 more windows that the sun is shining through. Victoria is facing sun on the furniture similar to what is behind her from 2 more windows on the opposite side of the bed. To get her decently exposed, I had to blow out the highlights in the background...something we wouldn't have to do with portrait style lighting. The background is over-exposed in order to get the subject properly exposed.

    Happens a lot in photography.

    Oh yeah, thats right; theres more windows to that room. Still its a decent amount of interior light, which is good because thats what you'd get inside on a sunny day. I too have been finding I have to over-expose the sunlight to get a room to fill appropriately with light - thats why I was so interested in Szark's methodology, as he seems to have avoided that issue. Thanks for the link to the other thread that has Pete's tone mapping settings - very helpful :)

    Szark said:
    dhmohr Why does she have a face on her posterior ;-)

    because she is happy, like a room without a roof.

    Thats a -1 for quoting a terrible song! ;)

    Post edited by tl155180 on
  • FishtalesFishtales Posts: 6,162
    edited December 1969

    This is my first attempt with Iray; CPU renders only as I don't have the right GPU; each took around 2 hours everything default except the Tone Mapping settings. The camera was set for DoF across the Lizard Man and the coffin. The F/Stop is different between the camera and the Iray Tone Mapping setting but the DoF seems to be in the right place. Lighting was supplied by the light set that came with The Crypt consisting of point lights for the candles and UberEnvironment 2 with the candle nearest the lizard having the light increased a little so that it shone on his body.

    Image one has ISO set to 200

    Image two has ISO set to 400

    Image three is the Tone Mapping settings.

    the-crypt-iray-settings-001.jpg
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    the-crypt-iray-006.jpg
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    the-crypt-iray-005.jpg
    1280 x 960 - 1M
    the-crypt-iray-settings-001.jpg
    245 x 367 - 57K
    the-crypt-iray-006.jpg
    1280 x 960 - 1M
    the-crypt-iray-005.jpg
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  • dHandledHandle Posts: 617
    edited December 1969

    Fishtales said:
    dhmohr

    Why does she have a face on her posterior ;-)

    HA! I didn't even notice that!

    I wonder if Moyra noticed it...

    (Princess of Darkness for Fantasy Dress)

  • SzarkSzark Posts: 10,634
    edited December 1969

    tl155180 said:
    Szark said:
    Fishtales said:
    dhmohr

    Why does she have a face on her posterior ;-)


    because she is happy, like a room without a roof.

    Thats a -1 for quoting a terrible song! ;)ROFLOL I never liked it either until I watch this https://www.youtube.com/watch?v=IbVoo7YLWnI

  • tl155180tl155180 Posts: 994
    edited December 1969

    Fishtales said:
    This is my first attempt with Iray; CPU renders only as I don't have the right GPU; each took around 2 hours everything default except the Tone Mapping settings. The camera was set for DoF across the Lizard Man and the coffin. The F/Stop is different between the camera and the Iray Tone Mapping setting but the DoF seems to be in the right place. Lighting was supplied by the light set that came with The Crypt consisting of point lights for the candles and UberEnvironment 2 with the candle nearest the lizard having the light increased a little so that it shone on his body.

    Image one has ISO set to 200

    Image two has ISO set to 400

    Image three is the Tone Mapping settings.

    Thats good - very atmospheric. I was under the impression that UberEnvironment lights don't work at all in Iray, so we might not be seeing the effects of that. Dunno; haven't tried it myself.

    The DoF comment is an interesting one. In my experience DoF on the camera settings works fine, but DoF associated with the F/stop in tone mappings doesn't seem to work. I've put the tone mapping F/stop right down to small values like 1.4 before and it doesn't seem to make any difference to DoF to me.

    From what I can tell, all of the tone mapping settings are just there to adjust light/exposure levels - it doesn't appear to behave in the same way you'd expect real life tone mapping on a camera to work.

  • tl155180tl155180 Posts: 994
    edited December 1969

    Szark said:
    ROFLOL I never liked it either until I watch this https://www.youtube.com/watch?v=IbVoo7YLWnI

    *giggle* thats a pretty cool video

  • FishtalesFishtales Posts: 6,162
    edited December 1969

    tl155180 said:

    Thats good - very atmospheric. I was under the impression that UberEnvironment lights don't work at all in Iray, so we might not be seeing the effects of that. Dunno; haven't tried it myself.

    The DoF comment is an interesting one. In my experience DoF on the camera settings works fine, but DoF associated with the F/stop in tone mappings doesn't seem to work. I've put the tone mapping F/stop right down to small values like 1.4 before and it doesn't seem to make any difference to DoF to me.

    From what I can tell, all of the tone mapping settings are just there to adjust light/exposure levels - it doesn't appear to behave in the same way you'd expect real life tone mapping on a camera to work.

    What I have found out after some more rendering.

    UberEnvironment isn't used by Iray as far as I can make out.

    Tone Mapping is the Iray camera but to get DoF you have to have a camera with it set up. The settings in the camera aren't used for the image. Changing the F/stop, ISO or speed only affects the DoF, not the lighting. Once DoF is set up changing the F/Stop, ISO or speed in Tone Mapping changes the amount of light used by Iray to render the image as would happen with a camera in 3Delight.

  • tl155180tl155180 Posts: 994
    edited July 2015

    Fishtales said:
    tl155180 said:

    Thats good - very atmospheric. I was under the impression that UberEnvironment lights don't work at all in Iray, so we might not be seeing the effects of that. Dunno; haven't tried it myself.

    The DoF comment is an interesting one. In my experience DoF on the camera settings works fine, but DoF associated with the F/stop in tone mappings doesn't seem to work. I've put the tone mapping F/stop right down to small values like 1.4 before and it doesn't seem to make any difference to DoF to me.

    From what I can tell, all of the tone mapping settings are just there to adjust light/exposure levels - it doesn't appear to behave in the same way you'd expect real life tone mapping on a camera to work.

    What I have found out after some more rendering.

    UberEnvironment isn't used by Iray as far as I can make out.

    Tone Mapping is the Iray camera but to get DoF you have to have a camera with it set up. The settings in the camera aren't used for the image. Changing the F/stop, ISO or speed only affects the DoF, not the lighting. Once DoF is set up changing the F/Stop, ISO or speed in Tone Mapping changes the amount of light used by Iray to render the image as would happen with a camera in 3Delight.

    I assume you mean that the settings on the camera aren't used for the lighting in the image? Obviously the camera settings do affect DoF in the image.

    So its camera settings for DoF and then tone mapping for lighting/exposure. Cool, thats what I thought. Thanks for confirming :)

    I guess that means we don't have to worry about lowering F/stop too much in the tone mapping settings causing a blurry image then.

    Post edited by tl155180 on
  • FishtalesFishtales Posts: 6,162
    edited December 1969

    tl155180 said:

    I assume you mean that the settings on the camera aren't used for the lighting in the image? Obviously the camera settings do affect DoF in the image.

    So its camera settings for DoF and then tone mapping for lighting/exposure. Cool, thats what I thought. Thanks for confirming :)

    I guess that means we don't have to worry about lowering F/stop too much in the tone mapping settings causing a blurry image then.

    As far as I can make out that is correct. Set your DoF in the camera and then use the tone mapping settings to get the lighting required to view the image.

  • tl155180tl155180 Posts: 994

    Hey Pete - You did a really good job on the materials for that Rosemoor render. I was wondering what your process is for converting the materials to Iray? Do you just play with all the sliders and do test renders until you get something that looks right, or do you use the Iray materials presets in some way as a guide?

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