Checking existance of Navmesh

Hi everyone,

I am using the following code to generate a random position for my AI to reach while patrolling an area. Before choosing the next location to reach, the AI performs a check to see if the Navmesh exists on the location of the next target.

Code (CSharp):

1. NavMeshPath sentiero = new NavMeshPath();
2.             bool esisteNavMesh = agenteScript.CalculatePath( new Vector3(xVal, yVal, zVal), sentiero);
3.             while (esisteNavMesh == false)
4.             {
5.                 xVal = Random.Range(posIA.x - 5f, posIA.x + 5f);
6.                 zVal = Random.Range(posIA.z - 5f, posIA.z + 5f);
7.                 yVal = Terrain.activeTerrain.SampleHeight(new Vector3(xVal, 0, zVal));
8.                 esisteNavMesh = agenteScript.CalculatePath(new Vector3(xVal, yVal, zVal), sentiero);
9.             }

Unfortunately this is not robust. 10% of the times it will pick a spot which lays outside the Navmesh. This means that the method CalculatePath is not working as I imagined.

Anyone knows why?

Thanks in advance.

 

Maybe you should install the navmesh on a plane that covers the ground instead of on the ground itself?

 

Is that really necessary? If I have huge maps this seems quite a tedious process.

 

Well, you can do that in small places at least.

 

Thanks. But I have the feeling that doing this won't necessairily solve my problem, because the exact same process will be performed on the plane then.