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Caleb Seelhoff 81c7cb6527 [rmodels] Fix glTF skinning when joints have non-joint parent nodes (#5876)
* [rmodels] Fix glTF skinning when joints have non-joint parent nodes

Some glTF exporters (notably wow.export, but also various other DCC pipelines) place skin joints under intermediate non-joint transform nodes that carry part of the bind-pose offset. raylib's existing LoadBoneInfoGLTF and LoadModelAnimationsGLTF only inspected a joint's immediate parent and only sampled joint-local TRS, so any transform stored on an intermediate non-joint ancestor was silently dropped, producing exploded or stretched meshes at runtime.

Two surgical changes:

LoadBoneInfoGLTF: walk the parent chain past any non-joint ancestors when looking up parentIndex, instead of comparing only against node.parent. Joints whose direct parent is a non-joint were previously treated as skeleton roots.

LoadModelAnimationsGLTF: precompute a per-joint extOffset matrix that bakes in the static TRS contribution of any intermediate non-joint nodes between the joint and its nearest joint ancestor. Apply it to each frame's joint TRS before BuildPoseFromParentJoints so the per-frame world transforms match the bind-pose world transforms (LoadGLTF already used cgltf_node_transform_world for bindPose, so this aligns the two code paths).

The replaced root-only worldTransform adjustment is a strict subset of the new per-joint extOffset machinery, so it has been removed.

Spec-compliant files (the six skeletal-skinning .glb examples shipped with raylib) render bit-identically before and after; previously broken files (e.g. wow.export's babyoctopus.gltf) now match the reference rendering from f3d, the Khronos sample viewer, and three.js.

* Resolve review: NULL-check joint offset allocation, fail fast

[rmodels] Address review feedback on glTF joint offset handling

Resolve the open review points raised on PR #5876 for the per-joint
extOffset precompute in LoadModelAnimationsGLTF.

* NULL check: validate the extOffset RL_MALLOC result before use, which
  was previously missing.

* Fail-fast handling: detect the allocation failure at its source and
  abort animation loading (log a warning, free resources, return NULL)
  instead of propagating a NULL pointer into the per-frame loop.

* Brace formatting: expand the collapsed one-line joint-match check
  (if (...) { isJoint = true; break; }) into raylib's standard Allman
  brace style.

* Readability: break the deeply nested MatrixMultiply(MatrixMultiply(...))
  into named nodeScale/nodeRotation/nodeTranslation/nodeTransform locals,
  mirroring the existing S/R/T composition later in the function.

* Spacing/line breaks: add blank lines within the precompute block to
  match the surrounding code style.
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raylib is a simple and easy-to-use library to enjoy videogames programming.

raylib is highly inspired by Borland BGI graphics lib and by XNA framework and it's especially well suited for prototyping, tooling, graphical applications, embedded systems and education.

NOTE for ADVENTURERS: raylib is a programming library to enjoy videogames programming; no fancy interface, no visual helpers, no debug button... just coding in the most pure spartan-programmers way.

Ready to learn? Jump to code examples!



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features

  • NO external dependencies, all required libraries are included into raylib
  • Multiple platforms supported: Windows, Linux, MacOS, RPI, Android, HTML5... and more!
  • Written in plain C code (C99) using PascalCase/camelCase notation
  • Hardware accelerated with OpenGL: 1.1, 2.1, 3.3, 4.3, ES 2.0, ES 3.0
  • Unique OpenGL abstraction layer (usable as standalone module): rlgl
  • Software Renderer backend (no OpenGL required!): rlsw
  • Multiple Fonts formats supported (TTF, OTF, FNT, BDF, sprite fonts)
  • Multiple texture formats supported, including compressed formats (DXT, ETC, ASTC)
  • Full 3D support, including 3D Shapes, Models, Billboards, Heightmaps and more!
  • Flexible Materials system, supporting classic maps and PBR maps
  • Animated 3D models supported (skeletal bones animation) (IQM, M3D, glTF)
  • Shaders support, including model shaders and postprocessing shaders
  • Powerful math module for Vector, Matrix and Quaternion operations: raymath
  • Audio loading and playing with streaming support (WAV, QOA, OGG, MP3, FLAC, XM, MOD)
  • VR stereo rendering support with configurable HMD device parameters
  • Huge examples collection with +140 code examples!
  • Bindings to +70 programming languages!
  • Free and open source

basic example

This is a basic raylib example, it creates a window and draws the text "Congrats! You created your first window!" in the middle of the screen. Check this example running live on web here.

#include "raylib.h"

int main(void)
{
    InitWindow(800, 450, "raylib example - basic window");

    while (!WindowShouldClose())
    {
        BeginDrawing();
            ClearBackground(RAYWHITE);
            DrawText("Congrats! You created your first window!", 190, 200, 20, LIGHTGRAY);
        EndDrawing();
    }

    CloseWindow();

    return 0;
}

build and installation

raylib binary releases for Windows, Linux, macOS, Android and HTML5 are available at the Github Releases page.

raylib is also available via multiple package managers on multiple OS distributions.

Installing and building raylib on multiple platforms

raylib Wiki contains detailed instructions on building and usage on multiple platforms.

Note that the Wiki is open for edit, if you find some issues while building raylib for your target platform, feel free to edit the Wiki or open an issue related to it.

Setup raylib with multiple IDEs

raylib has been developed on Windows platform using Notepad++ and MinGW GCC compiler but it can be used with other IDEs on multiple platforms.

Projects directory contains several ready-to-use project templates to build raylib and code examples with multiple IDEs.

Note that there are lots of IDEs supported, some of the provided templates could require some review, so please, if you find some issue with a template or you think they could be improved, feel free to send a PR or open a related issue.

learning and docs

raylib is designed to be learned using the examples as the main reference. There is no standard API documentation but there is a cheatsheet containing all the functions available on the library a short description of each one of them, input parameters and result value names should be intuitive enough to understand how each function works.

Some additional documentation about raylib design can be found in raylib GitHub Wiki. Here are the relevant links:

contact and networks

raylib is present in several networks and raylib community is growing everyday. If you are using raylib and enjoying it, feel free to join us in any of these networks. The most active network is our Discord server! :)

contributors

license

raylib is licensed under an unmodified zlib/libpng license, which is an OSI-certified, BSD-like license that allows static linking with closed source software. Check LICENSE for further details.

raylib uses internally some libraries for window/graphics/inputs management and also to support different file formats loading, all those libraries are embedded with and are available in src/external directory. Check raylib dependencies LICENSES on raylib Wiki for details.

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