Exported gltf model looks incomplete

I exported a model of gltf format from 3dsmax, when I dragged it into sandbox, I found that the model was imcomplete.No matter how I turned my perspective, what I saw was always the incomplete part directly in front of me.

in 3dsmax:

in sandbox:

exporter configuration:

Then I turn on “Render wireframe over mesh”, the mesh is obviously incomplete:

Then turn on “Render vertex normals”,

How can I solve this issue? Thanks in advance!!

The best way is to delete the problem mesh and make a new one with all polygons closed.

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It looks like just a backFaceCulling setting of your materials.


(not sure, but I think you have an option in your 3dsmax materials about that)


Yes!! You are right! Thank you so much!!!