Method extractMaterial

packages/asset-system/src/loaders/FBXLoader.ts:875–909

* Extract material from FBX Material node * 从 FBX Material 节点提取材质

(node: FBXNode)

     * 从 FBX Material 节点提取材质
     */
    private extractMaterial(node: FBXNode): FBXMaterial | null {
        const id = node.properties[0] as bigint;
        const nameProp = node.properties[1];
        let name = 'Material';
        if (typeof nameProp === 'string') {
            name = nameProp.split('\x00')[0] || name;
        }

        // Default values
        // 默认值
        let diffuseColor: [number, number, number] = [0.8, 0.8, 0.8];
        let opacity = 1;

        // Find Properties70 node for material properties
        // 查找 Properties70 节点获取材质属性
        const props70 = node.children.find(c => c.name === 'Properties70');
        if (props70) {
            for (const prop of props70.children) {
                if (prop.name === 'P' && prop.properties.length >= 5) {
                    const propName = prop.properties[0] as string;
                    if (propName === 'DiffuseColor') {
                        diffuseColor = [
                            Number(prop.properties[4]) || 0.8,
                            Number(prop.properties[5]) || 0.8,
                            Number(prop.properties[6]) || 0.8
                        ];
                    } else if (propName === 'Opacity') {
                        opacity = Number(prop.properties[4]) || 1;
                    }
                }
            }
        }

        return { id, name, diffuseColor, opacity };
    }

    // ===== Animation Extraction Methods =====