I’m trying to import a mesh from blender into Roblox, but it says that I have too many triangles. How can I fix this?
Reduce the amount of triangles in the mesh.
And how would I go about doing so?
What is the mesh? Throw away unnecessary detail, and if you absolutely need it, split up the mesh.
A smooth tree trunk, I’m currently learning, not sure what to do or how.
You could add a decimate modifier, but that tends to not looks so good. Always remember to keep the triangles low from when you start the mesh.
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- Decimate modifier helps to reduce polygon count while maintaining the base structure of your mesh
- Select all vertices and press X, find ‘Limited Dissolve’, and click on that.
I hope this helps with your problem. It is very annoying when this pop-up restricting you to upload a mesh pops up, due to the triangle count limitation.
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Thank you, I tried adding a decimate modifier and it seem to have worked. 
This really does seem like an annoying restriction, plus I’m just now back to learning blender so it feels more complicated for me.
Cut them is pieces then import them 1 by one then just fix them back together
Please do not suggest cutting up meshes as a solution to circumvent tri limits. Does it allow you to upload your mesh to your game? Technically yes. Does it create a lot of performance issues for your game? Definitely yes.
Don’t do this except for very specific and exceptional situations.
Limited Dissolve or the Decimate modifier work much better and don’t mess up much, which is why most people suggest them as actual solutions 
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Yeah, I saw a tutorial saying to do so, and it just didn’t feel right to have to cut them in half. I’ve just been sticking with the Decimate modifier and it has been working wonderfully.