Parts turn invisible when looking from another angle

I made an barrel in blender and it looks like this:


Everything seems fine, I go into roblox studio insert the barrel into the game and parts of the barrel disappear and appear depending from what angle i look at the barrel. Video showing the problem: barrel fix - Create and share your videos with Clipchamp
Click on this link to see the video.

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Ah. Go to properties. Then click the ‘Double Sided’ option! :grinning:

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The faces on this model seem to be inverted. The easiest way, as stated by @Swellsways would be to use the ‘‘DoubleSided’’ function in Roblox Studio, however, it’s not always the best choice when considering performance. You can actually address this issue right in Blender - How to Flip Face Orientation | Flip Normals | Blender 2.9 Tutorial - YouTube

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I would suggest doing what @Techoye said because it gets to the root of the problem rather than just covering it up.

No! Don’t use DoubleSided! That’s a performance killer!

Instead, just flip the normals that show weirdly in blender.

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