通过 C# 生成点云到 USDZ

//需要生成点云的源文件
string file = "template.usdz";

// 创建一个场景实例
Scene scene = new Scene(file);

//获取 Aspose.3D 的点云对象并生成点云
var pc = new PointCloud();
scene.RootNode.Accept((Node n) =>
{
    if (n.Entities.Count > 0)
    {
        var transform = n.EvaluateGlobalTransform(true);
        foreach (var entity in n.Entities)
        {
            if (entity is Geometry g)
            {
                Merge(pc, g, transform);
            }
            else if (entity is IMeshConvertible mc)
            {
                var mesh = mc.ToMesh();
                Merge(pc, mesh, transform);
            }

        }
    }
    return true;
});

//生成点云的合并方法
private void Merge(PointCloud pc, Geometry g, Matrix4 transform)
{
    var tmp = PointCloud.FromGeometry(g, 10);
    for (int i = 0; i < tmp.ControlPoints.Count; i++)
    {
        var pt = transform * tmp.ControlPoints[i];
        pc.ControlPoints.Add(pt);
    }
}

// 创建一个新场景的实例
var newScene = new Scene(pc);

//保存时需要创建保存格式的SaveOptions对象
string output=System.IO.Path.GetTempPath() + Guid.NewGuid().ToString() + ".ply";
PlySaveOptions ply = new PlySaveOptions();
ply.PointCloud = true;
newScene.Save(output,ply);