Method parseBinary

packages/asset-system/src/loaders/FBXLoader.ts:342–430

* Parse binary FBX format * 解析二进制 FBX 格式

(buffer: ArrayBuffer)

     * 解析二进制 FBX 格式
     */
    private parseBinary(buffer: ArrayBuffer): {
        geometries: FBXGeometry[];
        models: FBXModel[];
        materials: FBXMaterial[];
        animStacks: FBXAnimationStack[];
        deformers: FBXDeformer[];
        connections: FBXConnection[];
    } {
        this.buffer = buffer;
        this.view = new DataView(buffer);
        this.offset = 0;

        // Read header
        // 读取头部
        this.offset = 21; // Skip magic
        this.offset += 2;  // Skip unknown bytes
        this.version = this.view.getUint32(this.offset, true);
        this.offset = FBX_HEADER_SIZE;

        // Parse root nodes
        // 解析根节点
        const nodes: FBXNode[] = [];
        while (this.offset < buffer.byteLength) {
            const node = this.parseNode();
            if (!node) break;
            nodes.push(node);
        }

        // Extract geometry and model data
        // 提取几何和模型数据
        const geometries: FBXGeometry[] = [];
        const models: FBXModel[] = [];
        const materials: FBXMaterial[] = [];

        // Animation data
        // 动画数据
        const animStacks: FBXAnimationStack[] = [];
        const animLayers: FBXAnimationLayer[] = [];
        const animCurveNodes: FBXAnimationCurveNode[] = [];
        const animCurves: FBXAnimationCurve[] = [];
        const deformers: FBXDeformer[] = [];

        // Find Objects node
        // 查找 Objects 节点
        const objectsNode = nodes.find(n => n.name === 'Objects');
        if (objectsNode) {
            for (const child of objectsNode.children) {
                if (child.name === 'Geometry') {
                    const geom = this.extractGeometry(child);
                    if (geom) {
                        geometries.push(geom);
                    }
                } else if (child.name === 'Model') {
                    const model = this.extractModel(child);
                    if (model) models.push(model);
                } else if (child.name === 'Material') {
                    const mat = this.extractMaterial(child);
                    if (mat) materials.push(mat);