Black line bug

[yohjimane]

Describe the bug
Seemingly based on camera angle, black line(s) can appear on the screen. Reproducing is extremely difficult unless you randomly see it happen, and can focus your mouse on the exact position. In the attached video, i had to turn my mouse sensitivity down to .001 to pin down the spot.

I did also capture this in renderdoc, in OXR Gunslinger installation, but unfortunately we didn't find any clues as to what the issue is there.

To Reproduce
Steps to reproduce the behavior:

1. Get really lucky

Expected behavior
There shouldn't be any black lines

Screenshots, videos

S.T.A.L.K.E.R.Call.of.Pripyat.2024.03.06.-.12.02.44.38.DVR_edit_smaller.mp4

Desktop (please complete the following information):

• OS: Windows 10
• OpenXRay (04a805a)

Additional context
So far I've only been able to repro the issue on r4 with new_shader_support enabled. Not sure if it's an issue on other renders / vanilla r4

[SkyLoaderr]

As a temporary solution, you can change the hbox_verts[24] variable (in Layers/xrRender/dxEnvironmentRender.cpp) by replacing

    {-1.f, 0.f, -1.f}, {-1.f, -1.f, -1.f},  // half
    {1.f, 0.f, -1.f}, {1.f, -1.f, -1.f},    // half
    {1.f, 0.f, 1.f}, {1.f, -1.f, 1.f},      // half
    {-1.f, 0.f, 1.f}, {-1.f, -1.f, 1.f}     // half

with

    {-1.f, -0.01f, -1.f}, {-1.f, -1.f, -1.f},  // half
    {1.f, -0.01f, -1.f}, {1.f, -1.f, -1.f}, // half
    {1.f, -0.01f, 1.f}, {1.f, -1.f, 1.f}, // half
    {-1.f, -0.01f, 1.f}, {-1.f, -1.f, 1.f} // half

[yohjimane]

@SkyLoaderr I just tested this out, and it seems to work! Any idea what a more permanent solution would look like?