Images containing 1 pixel lines cause flickering

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500 monsters and creatures images for card games - Set 1
  • Problem Description

    When using a tilemap, tiledbackground or even a single sprite made of 1px lines those lines start to flicker on movement.

    But the problem nearly disappears when turning off WebGL.

    First i started an "How To"-thread to ask if i doing something wrong, i am justing adding the link as reference:


    Attach a Capx ... .capx?dl=0

    Description of Capx

    It contains a tilemap made of 1px lines. on top there is a blue rectangle-sprite having 8-direction behavior so you can move across the map.

    Steps to Reproduce Bug

    • just move around using arrowkeys to cause movement of tilemap
    • or: assign the 8-direction behavior to the tilemap to move it directly

    Observed Result

    heavy flickering of those lines depending on movement-direction.

    Expected Result

    Nothing should flicker like rendering without WebGL

    Affected Browsers

    • FireFox: YES
    • NWjs: YES

    Operating System and Service Pack

    Win 10

    Construct 2 Version ID

    r233 (stable)

  • I got curious & tried it both WebGL "On" & "Off" but I see both state still flickering. Wait. Isn't that how graphics work? I'm not entirely sure but I think that is how graphic cards draw. As the screen moves it can't entirely keep up that causes the flickering.

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  • Closing as not a bug: you're just seeing the effect of linear sampling over sub-pixel positions. This is a normal result in computer graphics.

    For pixel-perfect display, use the project settings 'Letterbox integer scale', Pixel rounding on, and 'Point' sampling.

  • After switching to "Letterbox integer scale", activating Pixel rounding and Point-sampling it is even worse than before. after loading the game only vertical lines are shown. and if i move around those vertical lines start to flicker and sometimes disappear completely. i have no idea what i am doing wrong.

    But still on my dev-system it helps just to deactivate WebGL...

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