Generate Point Cloud to STL via Java

//The source file that needs to generate the point cloud and the output file after saving
String file = "template.stl";
String output = "outFile.ply";

//create an instance of Scene
Scene scene = new Scene(file);

//Get pointcloud object of Aspose.3D and generate a point cloud
PointCloud pc=new PointCloud();
scene.getRootNode().accept((Node n) ->
{
    if(n.getEntities().size()>0)
    {
        Matrix4 transform=n.evaluateGlobalTransform(true);
        for(Entity entity : n.getEntities())
        {
            if(entity instanceof Geometry){
                Geometry g= (Geometry) entity;
                Merge(pc, g, transform);
            }
            else if(entity instanceof IMeshConvertible){
                IMeshConvertible mc = (IMeshConvertible) entity;
                Mesh mesh=mc.toMesh();
                Merge(pc, mesh, transform);
            }
        }
    }
    return true;
});

// create an instance of newScene
Scene newScene= new Scene(pc);
PlySaveOptions ply = new PlySaveOptions();
ply.setPointCloud(true);
newScene.save(output, ply);

//Merge method for generating point clouds
private void Merge(PointCloud pc, Geometry g, Matrix4 transform)
{
    PointCloud tmp = PointCloud.fromGeometry(g, 10);
    for (int i = 0; i < tmp.getControlPoints().size(); i++)
    {
        Vector4 pt=Matrix4.mul(transform, tmp.getControlPoints().get(i));
        pc.getControlPoints().add(pt);
    }
}