Concave mesh wrongly rendered?

[gadapchetvoi]

Hi, I’ve just imported a simple mesh from Blender to Creator 3.83
It displayed with a missing surface at the nearest side to viewer’s eyes. (Both in Editor & Web preview)

Is it because the mesh is concave?
Please tell me how to fix this for other concave meshes?
Thanks so much!

Blender view

Cocos render

[jackedone]

no

[mr.kylin]

Check the cullmode of its materials, and change it to see what will happen.

[gadapchetvoi]

Thanks so much!
Culling is the keyword for this problem.
I changed this property & the mesh was rendered correctly

I wonder why material “builtin standard” doesn’t support this natively but need to set manually?