I cant create this hill

hi, i was about to create a tower defense map and i was searching for examples and i found one style of hills that i like, i was going to recreate it but my idea wont work. I was trying to make it in blender and import part by part to studio but the top part just got invible when i export it

hill that i found
image

mine attempt to recreate it
image

when i import to roblox


i separeted the top part from it to color and texturize it in roblox studio one by one but the top part just got invisible, and i dont know what i can make to solve it

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There are so many posts already about improper Blender or other 3d programs importing meshes with inverted faces.
There was even one earlier today.
Try the Search button up top and type in “mesh face doesn’t show”.

I can even see the difference in lighting from the Blender image top face edges and the angled faces. Search Blender forums for “Face Orientation”.

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you probably forgot to export the other mesh (assuming if you exported them via selection)

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i exported both with selection

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Top face might be inverted, go back in blender and edit mode, select the inverted face, hit Alt+N and recalculate outside.
Or if your lazy and don’t wanna go back to blender, you can tick the DoubleSided property in the mesh.

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wont work continue same thing as before
image

nvm now it worked

DoubleSided was only designed for simple flat meshes like leaves or paper.
Do not use it if you are worried about performance in your game. It doubles the amount of tris in every Mesh you use it in which could lead to lag if you have a lot of meshes. Say you have 500,000 tris total in all the Meshes in your place. If you use DoubleSided on all of them you would increase that to 1,000,000 tris which makes the rendering engine work harder.

It will also mess with the way the Mesh appears. In this case the original Mesh wasn’t formed properly so it will appear with weird shadows where the opposing face orientations meet.

As I stated before, when you work in Blender have your Face Orientation tool checked On. This will make the sides facing out blue, and the side facing inwards orange. If you need to change it then use @grimmerschool2’s suggestion of flipping the face(s).

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Thank you, it helped a lot, i remaked the original mesh and colored it in blender and it looks better then it was.

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