Creating Mesh for DepthMask Shader

I’m having a bit of trouble with an effect I am trying to make. I want to have a second camera view inside the first camera that I can toggle. This is similar to the ShapeWipe (http://wiki.unity3d.com/index.php/ShapeWipe) expect instead of having the view shrink or grow to transition from one camera to another, I just want a constant sized circle that shows the second camera view inside the first. Here is the link to my original question with a bit more detail of the effect I’m going for, Partial Texture Swapping in Real Time - Questions & Answers - Unity Discussions.

I’ve taken a look at the code for ScreenWipe and ShapeWipe and it looks like I need to apply a depthmask shader to a mesh. However, I’ve never really used any shaders and I’m not sure how to create a circular mesh.

I found code to create a mesh from code at Unity - Scripting API: Mesh but I don’t know what it wants for mesh.vertices, mesh.uv and mesh.triangles especially for a circle.

So any ideas how to create a circular mesh to use in a ScreenWipe type situation?

Thanks.

Just make it in a 3D app. In Blender, it’s Add->Mesh->Circle.