loading gltf

★☆☆☆by Ramon Santamaria (@raysan5)

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ZigC (original)

//! raylib [models] example - loading gltf
//!
//! Zig-API translation of examples/models/models_loading_gltf.c (raylib 6.2).
//! Example licensed under an unmodified zlib/libpng license.
//! Copyright (c) 2020-2025 Ramon Santamaria (@raysan5)

const std = @import("std");
const rl = @import("raylib");

pub fn main() !void {
    // Initialization
    const screen_width = 800;
    const screen_height = 450;

    rl.initWindow(screen_width, screen_height, "raylib [models] example - loading gltf");
    defer rl.closeWindow(); // Close window and OpenGL context

    // Define the camera to look into our 3d world
    var camera: rl.Camera = .{
        .position = .{ .x = 6.0, .y = 6.0, .z = 6.0 }, // Camera position
        .target = .{ .x = 0.0, .y = 2.0, .z = 0.0 }, // Camera looking at point
        .up = .{ .x = 0.0, .y = 1.0, .z = 0.0 }, // Camera up vector (rotation towards target)
        .fovy = 45.0, // Camera field-of-view Y
        .projection = .perspective, // Camera projection type
    };

    // Load model
    const model = try rl.loadModel("resources/models/gltf/robot.glb");
    defer rl.unloadModel(model);
    const position: rl.Vector3 = .{ .x = 0.0, .y = 0.0, .z = 0.0 }; // Set model world position

    // Load model animations
    const anims = try rl.loadModelAnimations("resources/models/gltf/robot.glb");
    defer rl.unloadModelAnimations(anims);

    // Animation playing variables
    var anim_index: usize = 0; // Current animation playing
    var anim_current_frame: u32 = 0; // Current animation frame

    rl.setTargetFPS(60); // Set our game to run at 60 frames-per-second

    // Main game loop
    while (!rl.windowShouldClose()) { // Detect window close button or ESC key
        // Update
        rl.updateCamera(&camera, .orbital);

        // Select current animation
        if (rl.isKeyPressed(.right)) {
            anim_index = (anim_index + 1) % anims.len;
        } else if (rl.isKeyPressed(.left)) {
            anim_index = (anim_index + anims.len - 1) % anims.len;
        }

        // Update model animation
        const anim = anims[anim_index];
        anim_current_frame = (anim_current_frame + 1) % @as(u32, @intCast(anim.keyframeCount));
        rl.updateModelAnimation(model, anim, @floatFromInt(anim_current_frame));

        // Draw
        rl.beginDrawing();
        defer rl.endDrawing();

        rl.clearBackground(.ray_white);

        {
            rl.beginMode3D(camera);
            defer rl.endMode3D();

            rl.drawModel(model, position, 1.0, .white);

            rl.drawGrid(10, 1.0);
        }

        rl.drawText(rl.textFormat("Current animation: {s}", .{anim.nameSlice()}), 10, 40, 20, .maroon);
        rl.drawText("Use the LEFT/RIGHT keys to switch animation", 10, 10, 20, .gray);
    }
}

/*******************************************************************************************
*
*   raylib [models] example - loading gltf
*
*   Example complexity rating: [★☆☆☆] 1/4
*
*   LIMITATIONS:
*     - Only supports 1 armature per file, and skips loading it if there are multiple armatures
*     - Only supports linear interpolation (default method in Blender when checked
*       "Always Sample Animations" when exporting a GLTF file)
*     - Only supports translation/rotation/scale animation channel.path,
*       weights not considered (i.e. morph targets)
*
*   Example originally created with raylib 3.7, last time updated with raylib 4.2
*
*   Example licensed under an unmodified zlib/libpng license, which is an OSI-certified,
*   BSD-like license that allows static linking with closed source software
*
*   Copyright (c) 2020-2025 Ramon Santamaria (@raysan5)
*
********************************************************************************************/

#include "raylib.h"

//------------------------------------------------------------------------------------
// Program main entry point
//------------------------------------------------------------------------------------
int main(void)
{
    // Initialization
    //--------------------------------------------------------------------------------------
    const int screenWidth = 800;
    const int screenHeight = 450;

    InitWindow(screenWidth, screenHeight, "raylib [models] example - loading gltf");

    // Define the camera to look into our 3d world
    Camera camera = { 0 };
    camera.position = (Vector3){ 6.0f, 6.0f, 6.0f };    // Camera position
    camera.target = (Vector3){ 0.0f, 2.0f, 0.0f };      // Camera looking at point
    camera.up = (Vector3){ 0.0f, 1.0f, 0.0f };          // Camera up vector (rotation towards target)
    camera.fovy = 45.0f;                                // Camera field-of-view Y
    camera.projection = CAMERA_PERSPECTIVE;             // Camera projection type

    // Load model
    Model model = LoadModel("resources/models/gltf/robot.glb");
    Vector3 position = { 0.0f, 0.0f, 0.0f }; // Set model world position

    // Load model animations
    int animCount = 0;
    ModelAnimation *anims = LoadModelAnimations("resources/models/gltf/robot.glb", &animCount);

    // Animation playing variables
    unsigned int animIndex = 0;         // Current animation playing
    unsigned int animCurrentFrame = 0;  // Current animation frame

    SetTargetFPS(60);                   // Set our game to run at 60 frames-per-second
    //--------------------------------------------------------------------------------------

    // Main game loop
    while (!WindowShouldClose())        // Detect window close button or ESC key
    {
        // Update
        //----------------------------------------------------------------------------------
        UpdateCamera(&camera, CAMERA_ORBITAL);

        // Select current animation
        if (IsKeyPressed(KEY_RIGHT)) animIndex = (animIndex + 1)%animCount;
        else if (IsKeyPressed(KEY_LEFT)) animIndex = (animIndex + animCount - 1)%animCount;

        // Update model animation
        animCurrentFrame = (animCurrentFrame + 1)%anims[animIndex].keyframeCount;
        UpdateModelAnimation(model, anims[animIndex], (float)animCurrentFrame);
        //----------------------------------------------------------------------------------

        // Draw
        //----------------------------------------------------------------------------------
        BeginDrawing();

            ClearBackground(RAYWHITE);

            BeginMode3D(camera);

                DrawModel(model, position, 1.0f, WHITE);

                DrawGrid(10, 1.0f);

            EndMode3D();

            DrawText(TextFormat("Current animation: %s", anims[animIndex].name), 10, 40, 20, MAROON);
            DrawText("Use the LEFT/RIGHT keys to switch animation", 10, 10, 20, GRAY);

        EndDrawing();
        //----------------------------------------------------------------------------------
    }

    // De-Initialization
    //--------------------------------------------------------------------------------------
    UnloadModelAnimations(anims, animCount); // Unload model animations data
    UnloadModel(model);         // Unload model

    CloseWindow();              // Close window and OpenGL context
    //--------------------------------------------------------------------------------------

    return 0;
}

From raylib 6.2. The original on GitHub.