Loading...
> >

Weird bug involving transparency

lou_harperlou_harper Posts: 1,163
in Technical Help (nuts n bolts)

There is this bug that happens to me all the time–when part of an object is fully transparent whatever is behind it becomes invisible. I'm attaching image to show.

Any idea why this is happening?

bug.png
1124 x 780 - 1M

Comments

  • lou_harperlou_harper Posts: 1,163

    I'm attaching a new file with a green background, because the froum changes transparent pngs into jpgs.

    bug2.png
    1124 x 780 - 1M
  • HylasHylas Posts: 4,975
    edited March 2022

    (edit)

    Post edited by Hylas on
  • Richard HaseltineRichard Haseltine Posts: 100,674

    Are you sure that isn't just refraction causing you to sse the background quite legitimately? Is there an index of refractions other than 1 applied, with a non-zero strength, and does adjusting the index of refraction change the effect?

  • lou_harperlou_harper Posts: 1,163

    Richard Haseltine said:

    Are you sure that isn't just refraction causing you to sse the background quite legitimately? Is there an index of refractions other than 1 applied, with a non-zero strength, and does adjusting the index of refraction change the effect?

    Hm. I didn't think of refraction. Maybe.

  • RL_MediaRL_Media Posts: 339

    I noticed some weirdness myself yesterday. Saved some renders out as PNG or TIFF, and when openning it in PS, I could fully see the checkerboard through a bunch of things I shouldn't, like people's faces. I tossed in a neon pink layer behind the render, but the neon pink did not show through the people thankfully. No idea why it does this.

  • HylasHylas Posts: 4,975

    Richard Haseltine said:

    Are you sure that isn't just refraction causing you to sse the background quite legitimately? Is there an index of refractions other than 1 applied, with a non-zero strength, and does adjusting the index of refraction change the effect?

    That was my first thought also... but wouldn't reflections/refractions show the HDRI, even if dome visibility is switched off?

  • HylasHylas Posts: 4,975
    edited March 2022

    I did some quick experiments, and objects with refraction usually reflect the surrounding HDRI but sometimes they do "reflect nothingness", if dome visibility is switched off! Very strange.

    To avoid this, either switch on dome visibility, or choose "Backdrop" in the Environment tab.

     

    Dome visible: glass cube is reflecting the blue HDRI

     

    Dome visibility off: note the "hole" in the middle

     

    Dome visibility still off, but Environment is switched to "Backdrop": the hole is gone, the cube is back to reflecting the HDRI.

    01.png
    640 x 800 - 255K
    02.png
    638 x 800 - 190K
    03.png
    640 x 800 - 160K
    Post edited by Hylas on
Sign In or Register to comment.