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When I turn up the roughness to 1, it completely goes away, but only because the surface is no longer reflective and is completely matte. I just want the material to look as it should (flexible aluminum tubing), but it keeps changing colors. I have point lights in the tunnel, and they're all the same temperature. Any thoughts? The still of the tunnel is how I'd like it to look.

enter image description here enter image description here enter image description here

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  • $\begingroup$ maybe try attaching another picture with the color that you want as comparison? $\endgroup$
    – lintang_biru
    Commented May 14, 2020 at 2:02
  • $\begingroup$ For sure, I'll do that now and include my node setup. Thanks $\endgroup$
    – Mason
    Commented May 14, 2020 at 3:50
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    $\begingroup$ The reason why some areas are lighter/darker is because of your lighting. You've got point lights spread out across the tunnel so the areas closer to the lights will be brighter and vice versa $\endgroup$
    – stphnl329
    Commented May 14, 2020 at 4:13
  • $\begingroup$ Normal aluminum tube will come with scratch(?) with one direction, it can be achieved by using Anisotropic value in Principle BSDF. And your light might need to set up more carefully $\endgroup$
    – HikariTW
    Commented May 14, 2020 at 4:31

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The reason why the tunnel gets brighter and darker is because of the point lights that you've scattered across the tunnel. Areas closer to the lights (orange dots shown below) are brighter.

enter image description here

You can fix that by moving the lights with the camera instead of fixing the lights into a single spot. Delete all but two of the lights and parent them to the camera (yellow dot). It doesn't really move the lights perfectly along the middle of the tunnel, but you could always animate them manually to fix that.

enter image description here

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  • $\begingroup$ This is really helpful, thanks so much! Going to give it a shot now. $\endgroup$
    – Mason
    Commented May 14, 2020 at 15:20

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