How to add an AI texture to a mesh in Roblox Studio

1. 1Get the mesh ready

   Roblox meshes take one material and one UV set each, and an individual mesh can not go over 20,000 triangles. Fix all three in your 3D app before you texture, so the texture is painted into the final UVs.

   The studio never changes your mesh. Its Bear sample has 25k triangles, which is fine for practice but over Roblox’s limit.

2. 2Paint the texture in the studio

   Upload the file in box 1 Your 3D model and leave Keep my UVs selected, so the texture fits the UV map Roblox will use.

   Describe the look, press Auto texture: 4 views (8 credits), and fix spots with Paint this view (2 credits). Steps: how to texture a 3D model with AI.

3. 3Download the texture PNG

   In box 5 Download, press Texture only (PNG). Check the note says "The PNG fits your model’s own UV map". If it says "This model got new UVs, so use the GLB", your file had no usable UVs: add a UV map in your 3D app and start again.

   The PNG is 2048 x 2048 on a desktop, or your file’s own texture size. Roblox accepts up to 4096 x 4096 and suggests about 1024 x 1024 for an object 20 x 20 studs big.

   

4. 4Import the mesh into Roblox Studio

   In Roblox Studio, open the File menu, choose Import, pick your mesh file (the same one you painted) and press Import. The 3D Importer takes .fbx, .obj and .gltf files.

   The Importer can also bring in textures with .fbx and .gltf files. Its docs do not name .glb, so the steady route is the one here: import the mesh, then add the PNG yourself.

5. 5Upload the PNG and copy its ID

   Open the Asset Manager from the Window menu or the Home tab, and use its import button to upload the PNG. Imported images go through Roblox moderation.

   Right-click the image and choose Copy Asset ID.

6. 6Set TextureID on the MeshPart

   Select the MeshPart in the Explorer, find TextureID in the Properties window and paste the ID. The texture shows on the mesh.

7. 7Or use a SurfaceAppearance for PBR

   For a surface that reacts to light, hover the MeshPart in the Explorer, click the ⊕ button and insert a SurfaceAppearance. Set its ColorMap to your texture. A SurfaceAppearance overrides TextureID.

   In the studio, Make PBR maps in box 4 and PBR maps (PNG) give a normal map ("_normal.png") and an ORM image ("_orm.png"). The normal map uses the OpenGL style Roblox asks for, so it can go in NormalMap. Roblox wants roughness and metalness as separate greyscale images, while the ORM image packs AO in red, roughness in green and metal in blue: split the green and blue channels in an image editor first, or leave those two maps empty.