you can push the mesh out along its normals by selecting the faces and doing edit mesh > transform component, and then dragging your Z (blue) handle out. the more you do it the blobbier your mesh will get though, but its good if you only need to make smaller adjustments.
Thanks for your reply. What I mean, is when I importing the mesh into UnrealEngine, its clipping. But when Im thickening the mesh, it dosent clip. I want to find a solution on this, without having to extrude every mesh I model.
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