ufbx

Single source file FBX file loader.

ufbx_load_opts opts = { 0 }; // Optional, pass NULL for defaults
ufbx_error error; // Optional, pass NULL if you don't care about errors
ufbx_scene *scene = ufbx_load_file("thing.fbx", &opts, &error);
if (!scene) {
    fprintf(stderr, "Failed to load: %s\n", error.description.data);
    exit(1);
}

// Use and inspect `scene`, it's just plain data!

// Let's just list all objects within the scene for example:
for (size_t i = 0; i < scene->nodes.count; i++) {
    ufbx_node *node = scene->nodes.data[i];
    if (node->is_root) continue;

    printf("Object: %s\n", node->name.data);
    if (node->mesh) {
        printf("-> mesh with %zu faces\n", node->mesh->faces.count);
    }
}

ufbx_free_scene(scene);

Documentation

Online documentation

Setup

Copy ufbx.h and ufbx.c to your project, ufbx.c needs to be compiled as C99/C++11 or more recent. You can also add misc/ufbx.natvis to get debug formatting for the types.

Features

The goal is to be at feature parity with the official FBX SDK.

• Supports binary and ASCII FBX files starting from version 3000
• Safe
  • Invalid files and out-of-memory conditions are handled gracefully
  • Loaded scenes are sanitized by default, no out-of-bounds indices or non-UTF-8 strings
  • Extensively tested
• Various object types
  • Meshes, skinning, blend shapes
  • Lights and cameras
  • Embedded textures
  • NURBS curves and surfaces
  • Geometry caches
  • LOD groups
  • Display/selection sets
  • Rigging constraints
• Unified PBR material from known vendor-specific materials
• Various utilities for evaluating the scene (can be compiled out if not needed)
  • Polygon triangulation
  • Index generation
  • Animation curve evaluation / layer blending
  • CPU skinning evaluation
  • Subdivision surface evaluation
  • NURBS curve/surface tessellation
• Progress reporting and cancellation
• Support for Wavefront .obj files as well

Platforms

The library is written in portable C (also compiles as C++) and should work on almost any platform without modification. If compiled as pre-C11/C++11 on an unknown compiler (not MSVC/Clang/GCC/TCC), some functions will not be thread-safe as C99 does not have support for atomics.

The following platforms are tested on CI and produce bit-exact results:

• Windows: MSVC x64/x86, Clang x64/x86, GCC MinGW x64
• macOS: Clang x64, GCC x64
• Linux: Clang x64/x86/ARM64/ARM32/PowerPC, GCC x64/x86/ARM64/ARM32, TCC x64/x86
• WASI: Clang WASM

Testing

• Internal tests run on all platforms listed above
  • 525 test cases / 563 FBX files
• Fuzzed in multiple layers
  • Parsers (fbx binary/fbx ascii/deflate/xml/mcx/obj/mtl) fuzzed using AFL
  • Structured FBX binary/ascii fuzzing using AFL
  • Built-in fuzzing for byte modifications/truncation/out-of-memory
  • Semantic fuzzing for binary FBX and OBJ files
• Public dataset: 4.7GB / 323 files
  • Loaded, validated, and compared against reference .obj files
• Private dataset: 33.6GB / 12618 files
  • Loaded and validated
• Static analysis for maximum stack depth on Linux GCC/Clang

Versioning

The latest commit in the master branch contains the latest stable version of the library.

Older versions are tagged as vX.Y.Z, patch updates (Z) are ABI compatible and work with older versions of the header from the same minor version (Y). Minor versions within a major verision (X) are expected to be source compatible after 1.0.0 but the 0.Y.Z releases can break for every minor release.

License

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ALTERNATIVE A - MIT License
Copyright (c) 2020 Samuli Raivio
Permission is hereby granted, free of charge, to any person obtaining a copy of
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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SOFTWARE.
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ALTERNATIVE B - Public Domain (www.unlicense.org)
This is free and unencumbered software released into the public domain.
Anyone is free to copy, modify, publish, use, compile, sell, or distribute this
software, either in source code form or as a compiled binary, for any purpose,
commercial or non-commercial, and by any means.
In jurisdictions that recognize copyright laws, the author or authors of this
software dedicate any and all copyright interest in the software to the public
domain. We make this dedication for the benefit of the public at large and to
the detriment of our heirs and successors. We intend this dedication to be an
overt act of relinquishment in perpetuity of all present and future rights to
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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