Geometry Shader

Are there any geometry shader support in Unity 3D?

I’m talking about Cg Code that can add new vertices/triangles in shader level.

Thanks,

I just wanted to put an update to this question, Unity 4 now supports DirectX 11 and therefore it implicitly supports Geometry shaders.

No.

http://forum.unity3d.com/threads/80069-Is-Geometry-Shader-supported-in-Unity3D

Here’s an example:
http://johannes.gotlen.se/blog/2013/02/realtime-marching-cubes/