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If you are in the Game Developement arena and use SketchUp to create assets then Unity 4.2 will be a welcome addition to your arsenal. This latest release has a ton of new improvements to an already very strong toolset.
But Unity is not just geared around gaming it is a very competent visualization application that breathe life into an project.
Download UnityNew in Unity 4.2

Licensing and Platforms
- Windows Store Apps and Windows Phone 8 support and BlackBerry 10 support.
- Now free: all "Basic" mobile licenses.
- Now free: realtime shadows.
- Now free: text-based serialization of materials, prefabs, scenes etc. for easier version control.
- Now free: NavMesh baking.
Graphic Enhancements
- Anti-aliased RenderTextures.
- Image Effects:
- Ambient Obscurance.
- Bloom.
- Blur.
- Tilt Shift.
- Camera Motion Blur.
- Vignetting.
- Edge detection.
- GPU Skinning! (requires Unity Pro)
- Completely automatic, no custom shaders needed.
- Works on DirectX 11.

Currently we have seen that Unity is synonymous with Game Development but recently there has being a surge in using for ArchViz
Abyss Studios Ltd., showcased how competent Unity is for ArchViz presentation in the video below.
Unity provides a plethora of options for presentations and it's website embedding means you can share with your clients presentation as and when you need without leaving the office