How to show navmesh in Game?

I want to draw navmesh as an image on interface in game. Can it be done and How?

Thanks in advance.

You can use NavMesh triangulation:

void Start() {
    triangulation = NavMesh.CalculateTriangulation();
}

void OnPostRender() {
    if (material == null) {
        return;
    }
    GL.PushMatrix();

    material.SetPass(0);
    GL.Begin(GL.TRIANGLES);
    for (int i = 0; i < triangulation.indices.Length; i += 3) {
        var triangleIndex = i / 3;
        var i1 = triangulation.indices*;*

var i2 = triangulation.indices[i + 1];
var i3 = triangulation.indices[i + 2];
var p1 = triangulation.vertices[i1];
var p2 = triangulation.vertices[i2];
var p3 = triangulation.vertices[i3];
var areaIndex = triangulation.areas[triangleIndex];
Color color;
switch (areaIndex) {
case 0:
color = walkableColor; break;
case 1:
color = nonWalkableColor; break;
default:
color = unknownColor; break;
}
GL.Color(color);
GL.Vertex(p1);
GL.Vertex(p2);
GL.Vertex(p3);
}
GL.End();

GL.PopMatrix();
}
That draws navmesh in a world scene. To draw on a image, I guess you need to construct a [Mesh][1] from this triangulation in a similar way, and then render it to a [RenderTexture][2]. For that you need to place a mesh with triangulation off your main scene view and put a camera (different from your main camera) to look at the mesh in a way you need. Then you assign this camera to a RenderTexture, and use some Material with this texture for your image.
UPDATE:
Scripts with OnPostRender() function [must be placed on Camera object to work][3]
[1]: Unity - Scripting API: Mesh
[2]: Unity - Manual: Render Texture
[3]: Unity - Scripting API: MonoBehaviour.OnPostRender()

There may be a better solution, but i think you can do this by using the navmesh triangulation and drawing the triangles with GL

http://docs.unity3d.com/ScriptReference/NavMesh.CalculateTriangulation.html

You will need to retrieve mesh data from NavMesh.CalculateTriangulation() and chuck it into GL or a GameObject’s Mesh Filter. The above posters covered the GL method, here’s an article covering the Mesh Filter / Mesh Renderer method, which also gives you more control over your object in the Inspector: Showing Unity’s NavMesh in-game — Terresquall Blog