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Modular pieces have a see-through seam

Hey, hi, i'm trying to use modular pieces to construct my levels, but apart from gettin really slow culling, i also get flickering seams between my modualr pieces. Pictured are 4 planes that flicker a seethrough seam (see pic 01,bright pixels are atmospheric fog). Planes are perfectly 512x512 cms and are spaced exactly 512 units apart, so this is pretty annoying.

I also tried merging 3 Static mesh actors (3 planes in a line), and a bright line (a see-through to the atmospheric fog) is gone, but now there's another line that also flickers in and out of existence (pic 2).

I realise that i can merge and weld the meshes in a 3D software, but this is going to introduce so much unnecessary work i'm hoping there's an easier solution.

alt text alt text

Product Version: UE 4.20
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seams-01.jpg (381.5 kB)
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asked Jul 25 '18 at 06:27 PM in Rendering

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Vermilion Wlad
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avatar image xDoHn Jul 25 '18 at 06:48 PM

Exact same thing happens to me when using modular pieces...let me know if you find a solution

avatar image Vermilion Wlad Aug 08 '18 at 09:44 AM

I did some experimenting and here's the results.

Adding an actual volume to the wall (or at least the sides) solved all of the issues, but adds triangles that you never see, so that's not a solution.

Then i looked at the VR Showdown example and managed to find a place where 4 modular pieces with zero volume are placed together and they produce no see-through seam. alt text

You can clearly see a texture seam, but you can't see the atmospheric fog no matter how hard i've rotated the camera around and stuff, so i figured the system works and i'm doing something wrong.

So i gave planes another try, the material changes produce no results, since the seam is there even on the worldgridmaterial, so i tried the only thing i could think of and increased the collision box i have from being exactly the size of the plane (from 512x512x64) to just a little tiny bit more (512,1x512,1x64) and voila, this thing absolutely almost gone! There's a tiny tiny sliver of flickering going on horizontal seams, but it's limited to an acceptable pixel or two, so i consider that this was the issue. Pretty weird, huh. alt text

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seams-04.jpg (251.6 kB)
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