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As DonB told, the users can use the 3DVIA models easily in their samples (you'll need a 3dvia account I guess) and there's some simple default assets in the libraries of the soft.
Generally speaking, 3DVIA Studio is a development environment, it's like visual studio but with a wysiwyg approach to create 3D interactive applications or experiences. It is similar to what 3DVIA Virtools provides but toward larger projects & more a "developer" audience. The idea is to import 3D model and to create "behaviors" (which basically code) inside Studio using either a visual (schematic) or text based (vsl) scripting language. All these new items - models+behaviors / behaviors - are publishable on and/or reusable from 3dvia.com
For the rendering capabilities of Studio, you can use it to import 3D assets coming from all DCC tools (such as 3DS Max, Maya, 3DVIA Shape, ...) and then change some of their parameters.