Hi @Hu, Jason ,
Which version of Visio are you using? Here is an article Compare Visio versions and features, you may have a look.
Per my research, some diagram types, such as FlowChart, Maps, and Network, have built-in stencils of 3D shapes. You could use the Shapes window to find 3D shapes and stencils.
Besides, you could also search and download Visio shapes or stencils in Microsoft Download Center.
For more information about downloading and using new shapes, see Import downloaded stencils.
Hope the information could be helpful to you.
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