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new to hdri problems

adamnathanwielandadamnathanwieland Posts: 8
in New Users

Hello - I am new to hdri images - just gon through the DAZ masterclass on youtube dealing with it.  I downloaded Dresden Station Night from Poly Haven - I created an envriomental node, with infinite sphere with ground and put the image in. It looked perfectly fine in filiment, but when I rendered it in Iray this is the result.... Is there a step I am missing? Thank you in advance for any help that you can give. :)

irayrender.png
2000 x 2000 - 4M

Comments

  • GordigGordig Posts: 10,056
    edited July 14

    The trick with HDRIs is that they're fundamentally 2-dimensional, so they only look completely correct at world zero. Adding a ground plane changes what DS thinks world zero is, causing those distortions you see. I just popped that HDRI into DS myself, and found that I had to change ground position to manual and raise ground origin Y to about 224, and then it looked normal again.

    edit: on further investigation, the HDRI looked normal, but that puts the ground plane way too high, so that's not really a workable solution. It's only the ground plane that introduces those distortions, so there might be some additional tips about using an HDRI with a ground plane so that you can compensate more easily.

    Post edited by Gordig on
  • adamnathanwielandadamnathanwieland Posts: 8

    Thank you - I will start from scratch and try a new hdri image :)

  • adamnathanwielandadamnathanwieland Posts: 8

    This one is better ! I think the problem was including the ground plain, plus the order I was doing things. This time I put the background on first, moved the 'camera' a small degree to where I wanted the man, and then added him and everything seemed to work!. 

    Rockinghammanonholiday.png
    1920 x 1920 - 5M
  • GordigGordig Posts: 10,056

    It might be worth getting Catcher Plus or Iray HDRI Toolkit, because I could only get those distortions to occur when the ground plane was enabled, and either of those kits would let you get ground shadows without the actual ground.

  • adamnathanwielandadamnathanwieland Posts: 8

    THanks for the tips - I purchased the resources - now wI have to learn how to use them :) One step at a time :)

  • HylasHylas Posts: 4,988

    For scenes that show a characters feet I recommend using HDRI's only for skies and distant scenery. Ground and close scenery should be actual geometry.

  • FishtalesFishtales Posts: 6,119
    edited July 14

    Hylas said:

    For scenes that show a characters feet I recommend using HDRI's only for skies and distant scenery. Ground and close scenery should be actual geometry.

     Why? I used Dresden Station HDR in this old render. I also have others using HDR's.

    holiday-train-copyright-002.jpg
    1920 x 1080 - 355K
    Post edited by Fishtales on
  • jjoynerjjoyner Posts: 617

    Gordig said:

    It might be worth getting Catcher Plus or Iray HDRI Toolkit, because I could only get those distortions to occur when the ground plane was enabled, and either of those kits would let you get ground shadows without the actual ground.

    Gordig,

    Do you have experience and/or success with using Catcher Plus to produce shadows on 2D images?  I started a thread asking for help on this yesterday.  https://www.daz3d.com/forums/discussion/694576/catcher-plus-3d-universe#latest

    Thanks.

  • GordigGordig Posts: 10,056

    jjoyner said:

    Gordig,

    Do you have experience and/or success with using Catcher Plus to produce shadows on 2D images?  I started a thread asking for help on this yesterday.  https://www.daz3d.com/forums/discussion/694576/catcher-plus-3d-universe#latest

    I don't actually own either product, don't use HDRIs in the way the OP is trying to, and no longer render in DS.

  • HylasHylas Posts: 4,988
    edited July 15

    Fishtales said:

    Hylas said:

    For scenes that show a characters feet I recommend using HDRI's only for skies and distant scenery. Ground and close scenery should be actual geometry.

     Why?

    Let me quote yourself back at you, from this old thread about this very subject: wink

     

    Fishtales said:

    I have found some work, most don't and that is with a lot of work :)

    tldr: too much hassle.

    Post edited by Hylas on
  • FishtalesFishtales Posts: 6,119

    Hylas said:

    Fishtales said:

    Hylas said:

    For scenes that show a characters feet I recommend using HDRI's only for skies and distant scenery. Ground and close scenery should be actual geometry.

     Why?

    Let me quote yourself back at you, from this old thread about this very subject: wink

     

    Fishtales said:

    I have found some work, most don't and that is with a lot of work :)

    tldr: too much hassle.

    Three years ago. Hopefully I have moved on a bit since then :) Fair enough though If you can't spend the time to get them to work. I am retired so have all day most days to jump in and out of Daz Studio, not everyone has that luxury :) 

  • jjoynerjjoyner Posts: 617
    edited July 15

    Gordig said:

    jjoyner said:

    Gordig,

    Do you have experience and/or success with using Catcher Plus to produce shadows on 2D images?  I started a thread asking for help on this yesterday.  https://www.daz3d.com/forums/discussion/694576/catcher-plus-3d-universe#latest

    I don't actually own either product, don't use HDRIs in the way the OP is trying to, and no longer render in DS.

     

    sad face.jpg
    225 x 225 - 5K
    Post edited by jjoyner on
  • FishtalesFishtales Posts: 6,119

    The Matte Function in DAZ Studio is what I use when needed.

    Tutorials here.

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