How to cut mesh?

Questions & Answers
1

I was make Circle graph using mesh.
And I want make Donut graph.

So I think, cut the inner circle from Circle graph.
How can I cut the inner circle mesh??

2

There’s no way to modify the mesh from inside Unity Editor natively.
You have two choices:

  • use an external program, like Blender (free but difficult), Maya, 3DS Max, and so on
  • use one of the many editor extensions that can give you basic mesh editing right inside Unity, you can find them on the asset store, just by searching “mesh”: Unity Asset Store - The Best Assets for Game Making
3

There are already solutions for creating graphs on the asset store if it fits your needs.

If not you can generate the meshes yourself

Its not directly graphs that are generated in this tutorial but this could also help get started with generating meshes.
http://unity3d.com/learn/tutorials/modules/advanced/scripting/procedural-cave-generation-pt3?playlist=17153

4

For slicing a mesh to parts, you can use this asset:

Image:
109570-meshslicer.png