The stuff below is from http://www.visual3d.net .
I hope these claims are realized, it sounds interesting.
Rapid World Creation™ with Visual3D.NET
Visual3D.NET™ is a shader-based 3D engine and rapid production toolset for visually authoring interactive virtual worlds using C# and VB with Microsoft .NET, XNA Framework, and Visual Studio.
Build Worlds with the Ease of Web Design™
Visual3D.NET enables interactive world applications to be produced with unprecedented level of simplicity, productivity, and flexibility through an intuitive standard approach similar to developing web applications with ASP.NET and Visual Studio.
A Simplified Approach to Productivity™
Construct The Environment from Objects
Prototype Actors with Behaviors for Interactivity
Script Logic with C#, Visual Basic, Java, and Python
Extend The World, Engine, and Toolset with Visual Studio
Deploy On PC and Xbox 360 with XNA Framework
Expand With End-User Modding and Scenario Creation
Continue Using Tailored Tools and Reusable Content for the Next Worlds…
Innovation in Reducing Costs, Complexity, and Time-to-Market
Focus on content creation for your interactive virtual world from the start using Visual3D.NET’s integrated suite of tools and full range of middleware technologies for out-of-box world authoring.
Streamlined art path and CAD support to reduce tedious media asset importing, conversion, management tasks and data loss with digital content creation (DCC) tools and upcoming workflow integration with CAD tools
Easy to learn and use integrated visual authoring environment for scene, object, and behavior design, scene and actor animation, .NET scripting,
Workflow integration with Visual Studio 2005 for scripting, modification, and engine and toolset extension using C#, C++, and Visual Basic with extensive suite of tools for debugging, testing, Windows Forms tools design, process management, source control, code completion, code generation, and refactoring
3D Engine with full-range of middleware technologies including 3D Graphics, Animation, GUIs, Physics, Audio, Input, Networking, AI Behaviors
High-performance Shader-based 3D Graphics with normal mapping, displacement mapping, shadows, terrain, dynamic visual effects