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hdr as background?

Last post 07-04-2008 11:13 AM by GeneK. 4 replies.
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  • 07-04-2008 9:24 AM

    hdr as background?

    What settings should I use to get an hdr file to appear correctly as background?
    Everything I try results in either a grossly washed out background or just
    black.

    Gene
  • 07-04-2008 9:27 AM In reply to

    Re: hdr as background?

    Which hdrs are you using?

  • 07-04-2008 10:11 AM In reply to

    Re: hdr as background?

    wrote in message news:4808@nxt.accurender.com...
    > Which hdrs are you using?

    So far, the default beach probe that comes with nXt and my
    own rectangular shore background. Results are the same
    with each.

    Gene
  • 07-04-2008 10:29 AM In reply to

    Re: hdr as background?

    I'm heading out for a bit-- and then out of town tomorrow--  but I would start with something simple-- like Aloha.  Don't try to get the hang of this by jumping into something like HFH right away-- better with something more interactive.  Start with the sun off-- it's often hard to calibrate the sun and hdrs-- you can do it, but I wouldn't start there.  Light the model with the hdr and click Visible.  That should be pretty easy.

    Keep in mind I'll be adding some more options here-- including lighting with a different hdr than the one that's visible-- and some more intensity multipliers.

    ************

    It's particularly difficult to create hdrs from photographs-- it really takes something like hdr shop and a series of photos taken at different f-stops to do it right.  The default beach probe is a good one to start with, though-- it is low res-- but a high-res version of it should be floating around on-- maybe on Paul Debevec's site.

    Roy

  • 07-04-2008 11:13 AM In reply to

    Re: hdr as background?

    wrote in message news:4810@nxt.accurender.com...
    > I'm heading out for a bit-- and then out of town tomorrow-- but I would start
    > with something simple-- like Aloha. Don't try to get the hang of this by
    > jumping into something like HFH right away-- better with something more
    > interactive. Start with the sun off-- it's often hard to calibrate the sun
    > and hdrs-- you can do it, but I wouldn't start there. Light the model with
    > the hdr and click Visible. That should be pretty easy.

    This what I get from Aloha using your suggested settings
    (which, as it turns out, are the same ones I tried with HfH).
    The projected background image is way brighter than the
    lighting the model receives, I would guesstimate by at least
    one stop and possibly two. HfH's results are identical.

    > Keep in mind I'll be adding some more options here-- including lighting with a
    > different hdr than the one that's visible-- and some more intensity
    > multipliers.

    If you can provide separate brightness/intensity controls
    for the hdr lighting and the visible background, I think that
    would work as a fix. It's essentially what I did through
    work-around in AR4 by making the hdr not visible and
    then mapping a non-hdr bitmap of the same image as
    a spherical background and adjusting the brightness of
    the background image in PhotoPaint.

    > It's particularly difficult to create hdrs from photographs-- it really takes
    > something like hdr shop and a series of photos taken at different f-stops to
    > do it right. The default beach probe is a good one to start with, though-- it
    > is low res-- but a high-res version of it should be floating around on-- maybe
    > on Paul Debevec's site.

    I didn't make my shore hdr from photos, it's a downloaded
    hdr.

    Gene
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