NavMesh.CalculatePath

Parameters

Returns

bool True if a path is found.

Description

Calculate a path between two points and store the resulting path.

This function can be used to plan a path ahead of time to avoid a delay in gameplay when the path is needed. Another use is to check if a target position is reachable before moving the agent.

In contrast to NavMeshAgent.SetDestination, which is asyncronous call, this function calculates the path immeditely. This can be costly operation for very long paths and can cause hiccup in the frame rate. It is recommended to do only a few path finds per frame, for example when evaluating distances to cover points.

The returned path can be used to set the path for an agent using NavMeshAgent.SetPath. The agent needs to be close the starting point for the set path to work.

#pragma strict
// ShowGoldenPath.cs
public class ShowGoldenPath {
	public var target;
	private var path;
	private var elapsed = 0.0f;
	function Start() {
		path = new NavMeshPath();
		elapsed = 0.0f;
	}
	function Update() {
		// Update the way to the goal every second.
		elapsed += Time.deltaTime;
		if (elapsed > 1.0f) {
			elapsed -= 1.0f;
			NavMesh.CalculatePath(transform.position, target.position, NavMesh.AllAreas, path);
		}
		for (var i = 0; i < path.corners.Length - 1; i++)
			Debug.DrawLine(path.corners[i], path.corners[i + 1], Color.red);
	}
}

// ShowGoldenPath.cs
using UnityEngine;
using System.Collections;
public class ShowGoldenPath : MonoBehaviour {
	public Transform target;
	private NavMeshPath path;
	private float elapsed = 0.0f; 
	void Start () {
		path = new NavMeshPath();
		elapsed = 0.0f;
	}
	void Update () {
		// Update the way to the goal every second.
		elapsed += Time.deltaTime;
		if (elapsed > 1.0f) {
			elapsed -= 1.0f;
			NavMesh.CalculatePath(transform.position, target.position, NavMesh.AllAreas, path);
		}
		for (int i = 0; i < path.corners.Length-1; i++)
			Debug.DrawLine(path.corners[i], path.corners[i+1], Color.red);		
	}
}