Hello.
I’m sorry if this is in the wrong category. So I was bored and made a model in blender and then I imported that model which I made in Blender to Roblox studio. I exported the model as a .fbx file. When I imported the model I faced an issue. when I play and walk upon the mesh part this happens:
https://gyazo.com/c5bcf432a3f37cb14b87326338754df5
I don’t know what’s the problem as I’m new to blender and importing stuff to Roblox studio.
Help is appreciated.
Thank you! Have a nice day! 
That’s the mesh’s collision geometry.It accursed from the physical layer in the OSI model. … MSH = collisionMesh (Vertices) and it creates a convex mesh collision geometry.You can’t really fix it but you can just make it out of parts and unions and use meshes for details.
Check this out:
It describes how the CollisionFidelity Property works. You can select different levels of collision.
If it is really necessary, change the collision fidelity to “PreciseConvexDecomposition” instead of default or box, It can fix the collisions by a cost of a memory usage (performance). It is not really recommendable to have a game filled of physics calculations, specially for mobile players.
Anyways, sometimes the collisions are really wrong and this changes are necessary, specially when you cant replicate the model in Roblox.
Sometimes it will just dont work, no collision fidelity will be accurate and you just have to redo the model or desactivate the collisions and replicate it with Roblox parts.
Is the issue that you are walking on air? Please elaborate more on the issue as it’s hard to tell from the video.
Also, next time I suggest uploading the video directly to devforum as not a lot of people like clicking off-site links, even if it’s popular.
Hello.
So basically when I import stuff from Blender, there’s an issue with it. I import it as a .fbx file. When I hit play and walk upon mesh that I just imported, I stand in the air. I don’t know how to explain this so I showed a GIF.
Next time when I post something I will add videos, not links.
You most likely had verticies sticking out in those parts that weren’t connected to anything but still count as certified so you can walk on them. I would check for that.
There’s a plugin that helps show how Unions and Meshes CollisionFidelity looks. You can do the same thing by clicking in and out of the Settings of Studio and then changing a Property of the item you are viewing to make the change back and forth, but this plugin is much easier: