Why do I see this brightness line in my renderings?

Hi,

On my current project I’m encountering something strange and I can’t find the solution. After placing 3D grass, I observe a line, always at the same distance from the point of view, which marks a difference in luminosity on the grass. Whether I’m in a camera or not makes no difference.

I’ve built the light and reflections into my scene.

Do you know where this problem comes from?

Thank you very much,

Nobody :cry: ?