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How to Convert GLTF to OBJ
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When Do You Need to Convert GLTF to OBJ?
Converting glTF to OBJ is what you do when a modern web asset has to go into older software. Plenty of CAD packages, renderers and mesh tools were written before glTF existed and still expect OBJ.
What Happens When You Convert GLTF to OBJ
Assimp reads the glTF and writes OBJ with an accompanying MTL material file. Geometry and UV coordinates convert directly. What is lost is what glTF adds over OBJ: animations, skinning, cameras, lights and the physically based material model. Materials are approximated into OBJ's older lighting model, so surfaces that relied on roughness and metalness will not look the same. The scene hierarchy is flattened into object groups.
Worth knowing before you convert
A GLB with embedded textures needs those assets unpacked to be useful, since OBJ expects image files sitting next to the model.
About GLTF and OBJ
model/gltf+json
glTF is a file format for 3D scenes using JSON.
model/obj
OBJ is a geometry definition file format.
Conversion Notes
3D conversion from GLTF to OBJ preserves mesh geometry, but features like rigging, blend shapes, physics constraints, or procedural modifiers may not transfer if the target format doesn't support them. Material definitions are mapped to the closest equivalent — PBR textures are preserved where the target format supports them, otherwise a best-effort approximation is applied.
Frequently Asked Questions
No. OBJ is static geometry. Animation and skinning are dropped.