How to make 3D models for Silverlight 5?

I'am a .NET web developer, I really do not know anything about 3D yet. In Silverlight 5 3D API you draw stuff on the screen by code, no XAML for the 3D Objects/Models, I am wondering how 3D developers can make that cool sophisticated animated 3D games and scenes like the SL5 3D 'Windows Cafe' demo? which software is used to draw the model开发者_C百科 and make that light effects.. etc? how to import the models? how to animate them? I just want to know headlines/basics.

Now in Silverlight 2D the practices are clear, we draw everything with Expression Blend/Design or import graphics from Adobe Illustrator as XAML, then we use code and/or SL built-in animations to animate the XAML elements. What are the equivalents to make 3D with Silverlight 5?

Thank you.

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Most 3D modeling applications support a huge number of export formats. XNA uses the .X format which is supported by most modeling tools.

Have a look at this tutorial

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for .OBJ import from Silverlight read this article: http://silverlight.bayprince.com/tutorials.php?tutorial=11

at part 2 of that article they also show how to load textures: http://silverlight.bayprince.com/tutorials.php?tutorial=13

at the sidebar on the left, they seem to have more articles on Silverlight 3D that may be interesting