如何使用Helix Toolkit在WPF中导入3D模型？

I am trying to import a 3D model using Helix Toolkit.i can't figure out how to do it. Is there any online guide about importing a 3D model using this Toolkit or if there is another easier way to import a 3D model except Helix.I am trying to import a 3D model using Helix To