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Renders don't look like the preview

friqensteinfriqenstein Posts: 49
edited August 2022 in The Commons

Hello,

I am having an issue where, in the preview window with the iRay view enabled, everything looks perfectly fine. Then, when I actually render the image, there is a [very great deal] of poke through/clipping of clothes/items that were not at all an issue in the preview. What gives?

And why is it doing this all of a sudden when previously I haven't had an issue with the exact same scene? I didn't move the character or the clothing, I just attempted to re-render the image but now Daz want's to do its own thing... like most of Daz bugs.

How can I adjust for the clipping when the preview doesn't show it? Am I supposed to make a .1% adjustment, then render and see it didn't work and then do it all over again?

Please advise.
TIA.

Post edited by Richard Haseltine on

Comments

  • felisfelis Posts: 4,617

    There are some differences between preview and render.

    Two things that come to mind is subD level and displacement. Both these can causes clipping.

  • friqensteinfriqenstein Posts: 49

    My SubD is set the same for preview and render... not certain about displacement, as I'm not sure what it is so fairly certain it isn't something I've adjusted in anyway.

    This is what is throwing me off.. SubD are same for both, but it still freaks out. Similar to when I render an image from one camera angle, and then a different camera angle will render with black spots on the forehead or poke through.. it just doesn't make any sense. Nothing moves in the static scene, just a different camera angle and a different distance from the character.
    Why should that cause it to render something different each time?

    Thanks for the response... I forgot to add the bit about SubD when I first posted.

  • felisfelis Posts: 4,617

    Black spots on the forehead is usually due to the haircap, especially if the character is away from world origin.

    Two ways to fix that. The first to change instance optimization to either memory or speed, as that will technically recalculate world origin around the camera. The second is to expand the haircap a tiny bit.

  • friqensteinfriqenstein Posts: 49

    felis said:

    Black spots on the forehead is usually due to the haircap, especially if the character is away from world origin.

    Two ways to fix that. The first to change instance optimization to either memory or speed, as that will technically recalculate world origin around the camera. The second is to expand the haircap a tiny bit.

    Thanks for the info... I've been searching the inet for the black spot issue.. others have suggested a lot of different strategies, some of which require another program like photoshop to buff things out.. which I don't have. I'll look into the instance optimization you suggested. I've tried to adjust the haircaps and forehead layers of the hair, which sort of works but not 100%... I just don't understand how it doesn't show up in Camera1 but it does in Camera2... seems illogical to a layman.

    As for the original issue, the clipping, I've tried to adjust the smoothing, which sometimes works on other scenes, but lately it just seems that the more I increase the smoothing, the worse the clipping gets. And if I turn smoothing down to 1 or 2, most clothing either still clips, or just looks fugly with coarse contours.

    Is there some magic number between collision and smoothing? I know that sometimes I can 'hide' body parts that are fully covered but still clip, such as G8F breasts behind a full shirt, but even that is not really a solution. I know I'm no expert with Daz, but some of the stuff I've rendered before are just turning into trash now for reasons that I cannot figure out, even when I don't modify the scene.

    Thanks for the info. Going to go test it... 

  • richardandtracyrichardandtracy Posts: 5,870
    edited August 2022
    If you need to edit the image after creation, the open source equivalent of Photoshop is available for free, do a search for 'GIMP Software' and you should find it at gimp.org. It's an extraordinarily powerful program, but does not have the most user friendly interface, and it takes a fair time to learn how to use. I will confess I only use it when my preferred Paintshop Pro 5 can't cope, but GIMP always can cope. Regards, Richard.
    Post edited by richardandtracy on
  • JOdelJOdel Posts: 6,288

    There's also an online opensource called Photopea which will take and export in Photoshop format and does about 80% of what Photoshop does with a very similar interface.

  • LyonessLyoness Posts: 1,616

    JOdel said:

    There's also an online opensource called Photopea which will take and export in Photoshop format and does about 80% of what Photoshop does with a very similar interface.

    OMG. @JOdel

    I've been needing a lightweight photoshop.  Photopea is sheer perfection!!!!!
    thank you for pointing it out.

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