Transparent part of my fbx model

Hello,

I just started using UE4, I made a small map to make some tests but I got a problem while importing my models made with Blender.

There are some triangle that are transparents and I can’t manage to render them normally.
Could someone help me?

Thanks in advance.

at a guess, you should check the direction of the Normals in Blender before export.
a quick test in UE4 would be to look at your model from underneath to see if the missing triangles are visible from the other side

In blender go to edit mode, select your whole model and push CTRL+N and recalculate outside normals.