Method parseNode

packages/asset-system/src/loaders/FBXLoader.ts:436–505

* Parse a single FBX node (binary format) * 解析单个 FBX 节点（二进制格式）

()

     * 解析单个 FBX 节点（二进制格式）
     */
    private parseNode(): FBXNode | null {
        if (this.offset >= this.buffer.byteLength) return null;

        const is64Bit = this.version >= 7500;

        // Read node record
        // 读取节点记录
        let endOffset: number;
        let numProperties: number;

        if (is64Bit) {
            endOffset = Number(this.view.getBigUint64(this.offset, true));
            numProperties = Number(this.view.getBigUint64(this.offset + 8, true));
            // propertyListLen not used, skip reading it
            this.offset += 24;
        } else {
            endOffset = this.view.getUint32(this.offset, true);
            numProperties = this.view.getUint32(this.offset + 4, true);
            // propertyListLen not used, skip reading it
            this.offset += 12;
        }

        // Check for null node (end marker)
        // 检查空节点（结束标记）
        if (endOffset === 0) {
            return null;
        }

        // Read name
        // 读取名称
        const nameLen = this.view.getUint8(this.offset);
        this.offset += 1;
        const nameBytes = new Uint8Array(this.buffer, this.offset, nameLen);
        const name = String.fromCharCode(...nameBytes);
        this.offset += nameLen;

        // Read properties
        // 读取属性
        const properties: FBXProperty[] = [];
        for (let i = 0; i < numProperties; i++) {
            const prop = this.parseProperty();
            properties.push(prop);
        }

        // Read child nodes
        // 读取子节点
        const children: FBXNode[] = [];
        while (this.offset < endOffset) {
            // Check for null terminator
            // 检查空终止符
            const nullCheck = is64Bit ? 13 : 13;
            if (this.offset + nullCheck <= endOffset) {
                const testOffset = is64Bit
                    ? Number(this.view.getBigUint64(this.offset, true))
                    : this.view.getUint32(this.offset, true);
                if (testOffset === 0) {
                    this.offset = endOffset;
                    break;