How to Convert FBX to glTF in Python

Problem

Developers need to convert FBX 3D model files to the glTF or GLB format for use in web viewers, game engines, and modern rendering pipelines. Aspose.3D handles this with Scene.from_file() to load the FBX file and scene.save() to write the glTF output.

Note on FBX support: Aspose.3D FOSS has experimental FBX support. The FBX tokenizer is implemented but the parser has known structural bugs: incorrect CLOSE_BRACKET handling and unbounded recursion on complex nested FBX scopes. Complex or large FBX files may trigger RecursionError. Simple flat-geometry FBX may work. For production use, prefer COLLADA, OBJ, or glTF over FBX. See the FAQ for more detail.

Prerequisites

• Python 3.7 or later
• Install via pip: pip install aspose-3d-foss

from aspose.threed import Scene

Conversion Steps

Step 1: Load the FBX File

Use Scene.from_file() to load the FBX file. The format is detected automatically from the .fbx extension.

from aspose.threed import Scene

scene = Scene.from_file("input.fbx")

Step 2: Save to glTF Binary (GLB)

Call scene.save() with the .glb extension to write the output as a compact binary glTF file. The format is inferred automatically from the extension. This is the recommended approach: single-file, compact, and broadly compatible.

# Use the .glb extension for binary GLB output (auto-detected)
scene.save("output.glb")

Note: FileFormat.GLTF2_BINARY and FileFormat.GLTF are None stub constants in the current library version and should not be passed to scene.save(). Use file extension auto-detection or the FileFormat.GLTF2() factory method instead.

To save as JSON glTF instead:

scene.save("output.gltf")

Step 3: (Optional) Use GltfSaveOptions

For more control over the glTF output, pass a GltfSaveOptions object:

from aspose.threed.formats import GltfSaveOptions

opts = GltfSaveOptions()
opts.binary_mode = True
scene.save("output.glb", opts)

Code Example

Complete FBX-to-GLB conversion in three lines:

from aspose.threed import Scene

scene = Scene.from_file("input.fbx")
scene.save("output.glb")  # .glb extension triggers binary GLB output automatically

print("Conversion complete: input.fbx -> output.glb")

Supported Output Formats

When converting from FBX, the following output formats work reliably:

Note: FileFormat.GLTF2_BINARY, FileFormat.GLTF, and FileFormat.MICROSOFT_3MF are None stub constants and must not be passed to scene.save(). Use file-extension auto-detection or the factory methods shown above.

See Also

• How to Convert 3D Models with Aspose.3D
• Aspose.3D FAQ
• Load Files with Aspose.3D
• Render 3D Models with Aspose.3D