Which file formats are commonly supported for 3D model imports in Unity?

• A. GLTF and PLY
• B. DWG and STEP
• C. OBJ and FBX
• D. STL and OBJ

Answer: (C)

When working with Unity, the formats that reliably import across many tools and pipelines are FBX and OBJ. FBX is a robust container that can store geometry, UVs, normals, textures, and even animation data (rigs, skinning, blend shapes). This makes it the go-to for complex models and characters from major 3D applications. OBJ is a simple, widely supported geometry format that represents vertices, normals, and texture coordinates, usually paired with an external MTL file for materials. It’s ideal for static meshes and quick asset exchanges because virtually every modeling package can export it and Unity can import it without extra setup.

Other formats tend to be less common as standard imports in Unity: STL is oriented toward 3D printing, often lacking material or animation information; PLY is typically used for point clouds; DWG and STEP are CAD-focused and not designed for real-time rendering in game engines. GLTF/GLB is increasingly supported and used with plugins or newer Unity versions, but OBJ and FBX remain the most consistently importable out of the box.

So, OBJ and FBX are the most commonly supported choices for 3D model imports in Unity.