如何在Autodesk Forge中获取相机位置的中心？

// 假设viewer是已经初始化好的Forge Viewer实例
function getCameraCenter(viewer) {
    // 获取当前视口矩阵
    const viewMatrix = viewer.getCamera().getViewMatrix();
    
    // 获取视口的宽度和高度
    const viewport = viewer.getViewport();
    const width = viewport.width;
    const height = viewport.height;
    
    // 计算视口中心点
    const centerX = width / 2;
    const centerY = height / 2;
    
    // 将屏幕坐标转换为世界坐标
    const ray = viewer.getCamera().getPickRay(centerX, centerY);
    const centerPoint = viewer.model.getData().globalOffset.clone().add(ray.intersectionPoint);
    
    return centerPoint;
}

// 使用示例
const cameraCenter = getCameraCenter(viewer);
console.log('Camera Center:', cameraCenter);