Attaching objects into one changes their material appearance

[Alex_M]

I came upon a strange thing while attaching my objects into one. A particular object's material changed appearance. I've checked the materials IDs after attaching and they are all fine. If I detach it to separate objects again, the material changes back to the original look. Please see screenshot below.

[hermit.crab]

Not sure. Could you strip down the scene and attach it here or send it via the contact form? Address it to me in the subject and include a link to this thread in the message.

[Alex_M]

Sure, see attached.

[Joelaff]

I saw something similar recently. Didn’t have time to diagnose it, but it almost looked like the attach had messed up the smoothing.

[hermit.crab]

Thank you for the provided scene. The issue is caused by two things - the Rounded corners on the big cylinder and the refractiveness of the small cylinder. I am not yet sure if this is a bug or a byproduct of the rounded corners' effect. I'll write again with more information.

EDIT: Setting the Rounded corners mode to Convex only resolves the issue, so you may use it as a workaround.