Mesh

A mesh is a 3D object, such as a hat (catalog item), gear (catalog item) or. Every hat, gear, and package (except for the Mysterious Object) is made up of one or more meshes.

There are, which contain and  , among other mesh variations.

BlockMesh
BlockMeshes can be used as a replacement for a Part. The main difference is that a BlockMesh has pointy edges and is smooth instead of studded, welded, yielded, or glued.

CylinderMesh
CylinderMeshes, like BlockMeshes, replace what a Part looks like. A CylinderMesh is similar to but distinct from the SpecialMesh MeshType Cylinder, although they look identical.

This is now deprecated, as the cylinder mesh from es is favored.

User meshes
The earliest known introduction of meshes (including user meshes) was from 2006, where Roblox implemented official support for meshes. However, in 2008, official support for user generated meshes was eventually pulled and stopped.

From 2008 to 2010, players could upload their own custom meshes via a simple exploit made public by. However, the user-made meshes could only be seen by placing the mesh in a game while in Roblox Studio. In early 2011, this feature was removed due to the "inappropriate content" uploaded by abusers of the system. Because of this, many users have formed groups demanding meshes to be returned as an official feature.

In 2014, a user named was able to upload meshes, with some being of Sonic heads, Portal meshes, Halo meshes and even the famous SCP-173 from the SCP wiki, which was the first SCP ever made. This was later removed by an Administrator named. On June 9, 2016, player meshes were brought back into Roblox Studio. This caused a new section to be included in the Library section of the website and Roblox Studio dedicated to user-created meshes. This is the first time users can create meshes without the use of exploits. A mesh is required to be an OBJ or FBX file and have 5,000 polygons or lower to be successfully imported.

On January 1, 2019, a Bulk Import feature was added in which Roblox Studio would automatically split multi-msh files into separate meshes. This allows complex 3D models to preserve detail without having to deliberately lower the polygon count, and prevents the issue of the UV mapping glitching if a multi-mesh model is imported as a single mesh. Before this feature, users would separate meshes in a model with a 3D editing program, import each mesh separtely, and arrange the meshes manually back together in Roblox Studio.

Trivia

 * Roblox creates their meshes on Autodesk 3DS MAX.
 * People would usually use Blender to create their meshes, as it's easy to learn.
 * On a random day, roblox changed it so only 13+ accounts can upload meshes to the library, but <13 accounts can still upload models (doesn't work in most building games due to the fact the models could break the game)