Opaque mesh rendering as if its alpha blended by the renderer

Questions
1

This one set of meshes I exported from 3ds max has a weird rendering quirk where it render opaque meshes as if they were alpha blended; that means faces which should be obscured by other faces of the same mesh, get rendered anyway, as if z sorting is not done. No opacityTexture present, alpha set to 1 (default), alphaMode set to 2 (default)

What could be the cause of this? Corrupt 3d models? Some flag I could switch in BABYLON.Mesh? Thanks in advance,

3ds max
3ds max1153×859 298 KB
webgl
webgl1275×1088 275 KB

babylon3
babylon3800×738 212 KB

2

Are you sure all faces are treated as opaques? Maybe there are multiple materials and one is transparent?

That’s hard to tell more without a repro we can use to dig a bit more.

3

Thanks for the reply. There is only one material, and even if I remove it (mesh.material = null), the same behavior is maintained.

Anyway I might have found the cause. Vertex colors were also exported from 3ds max, and apparently they have an alpha channel as well, and it’s a tiny bit unintuitive to remove them in 3ds max.

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