Roblox breaking my models upon import

I do not know what is causing the issue but I’m importing a model from Blender I made into ROBLOX to use for a game (obviously) however when I preview the model in the import screen its broken (even when I end up importing it)

Heres what the model looks like in Blender:

As you can see the model looks rather normal, completely fine in the source program with no errors, looks completely clean right? Well…

…here is what in looks like in ROBLOX Studio / Import Preview:


That white triangle on the sides arent supposed to be there and I get a wierd issue on the front of the locomotive with stuff just doing stuff.

I have tried these options

  • I decimated geometry
  • I have cleaned up the model (Via Merge by Distance, etc)
  • I have checked to see if the normals need to be facing the outside
  • I have checked for flat surfaces that would otherwise be deforming like crazy
  • I have used the DoubleSided property in ROBLOX Studio itself
  • I have removed any loose faces, edges or verticies
  • I have removed empty meshparts with no verticies
  • I have applied transformation, rotation, location, scale, etc.

NOTHING. Nothing seems to work and its getting quite frustrating. Is there any way I could fix this? Or send my model to someone who could help and import said model into their ROBLOX and see if it imports right.

Thank you

1 Like

Seems like Roblox is decimating the mesh for being high poly.
Seperate the mesh into pieces?

How many tris is this Mesh? I’m guessing as @grimmerschool2 said that it’s over the limit of tris and Roblox is cutting back the tris.
Please don’t use DoubleSided as that doubles the number of tris in your model. It’s only designed for flat MeshParts like leaves or pieces of paper.
Can you cut the mesh into smaller sections, like the black, red, grey, and white sections?