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c#unity-game-enginepath-findingnavmesh
Marcel
Marcel

Reputation: 228

Unity - NavMeshAgent not working with multiple corners

I am currently working on a Unity3D Game and I ran in some problems with the nav mesh agents. My current objective is to get enemies to walk towards the closest player (there will be 3). One I spawn an enemy it will check for itself which of the players is closest. This is done with the remaining distance towards the player as seen in the code below 

agent.CalculatePath(player.transform.position, path);
agent.Stop();
agent.SetPath(path);

if (distance > agent.remainingDistance)
{
    distance = agent.remainingDistance;
    playerToFollow = player;
}

In this snippet the distance will start at ‘float.MaxValue’ and will (whenever a player is closer than the current distance be set as ‘playerToFollow’, which is a GameObject.

The problem lies here: When the path to the player has 0 or 1 corners. The nav mesh agent will start walking its path towards the player. BUT… whenever the path contains more than 1 corner, the distance will not be calculated, thus returning agent.remainingDistance == float.PositiveInfinity.

this means that distance (which is float.MaxValue) is less then remaining distance (float.PositiveInfity).

Any things I might forget? Please let me know. I can always provide more details .

Upvotes: 0

Views: 3078

Answers (1)

Marcel
Marcel

Reputation: 228

I fixed it by not using the distance in the agent. I am now using the path corners and calculating the distance between those.

 players.ForEach(
        player =>
        {
            agent.CalculatePath(player.transform.position, path);
            float pathDistance = calculatePathDistance(path);

            if (pathDistance < distance)
            {
                distance = pathDistance;
                playerToFollow = player;
            }

        }
    );

with the implementation of #calculatePathDistance(NavMeshPath path) being like:

private float calculatePathDistance(NavMeshPath path)
{
    float distance = .0f;
    for (var i = 0; i < path.corners.Length -1; i++)
    {
        distance += Vector3.Distance(path.corners[i], path.corners[i + 1]);
    }
    return distance;
}

If you have a way where the agent.remainingDistance works, please let me know.

Upvotes: 1

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