Draw path along Navmesh agent path

Question

Hi,

Now I have created Navmesh agent, it can walk through intelligently, but now I wanna visualize the path w$$anonymous$$ch agent walk along. That is draw a path of navmesh walking in script. Does someone have idea?? Thanks a lot :)

Answer 1

Answer by TakuanDaikon · Oct 04, 2014 at 11:39 PM

T$$anonymous$$s is a very basic example. It can be easily optimized, but I didn't bother because I only needed a quick and dirty visualization:

 void OnDrawGizmosSelected()
 {
 
     var nav = GetComponent<NavMeshAgent>();
     if( nav == null || nav.path == null )
         return;
 
     var line = t$$anonymous$$s.GetComponent<LineRenderer>();
     if( line == null )
     {
         line = t$$anonymous$$s.gameObject.AddComponent<LineRenderer>();
         line.material = new Material( Shader.Find( "Sprites/Default" ) ) { color = Color.yellow };
         line.SetWidth( 0.5f, 0.5f );
         line.SetColors( Color.yellow, Color.yellow );
     }
 
     var path = nav.path;
 
     line.SetVertexCount( path.corners.Length );
 
     for( int i = 0; i < path.corners.Length; i++ )
     {
         line.SetPosition( i, path.corners[ i ] );
     }
 
 }

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exorakhilas · Oct 21, 2015 at 09:44 AM 1

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Thank you for sharing!

chainalonez · Mar 23, 2016 at 04:07 PM 1

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it's nice sample, thanks a lot :)

Fredex8 chainalonez · Mar 23, 2016 at 04:45 PM 4

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Since this has been resurrected already...

If you only need it for debugging this can be done easier than that.

             for (int i = 0; i < path.corners.Length - 1; i++)
             {
                 Debug.DrawLine(path.corners[i], path.corners[i + 1], Color.red);
             }

TakuanDaikon Fredex8 · Mar 23, 2016 at 06:24 PM 1

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True, although the LineRenderer supplied some styling options I preferred that Debug.DrawLine() didn't, which of course I removed before posting the code.

Your way is indeed simple, effective, and concise.

You should promote the comment to an answer :)

ranybechara · Jan 25, 2017 at 04:06 PM 0

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This is great thanks ! but It only works when I click on the agent I have the script on in the hierarchy tab.

TakuanDaikon ranybechara · Jan 25, 2017 at 04:53 PM 1

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Right, because it's OnDrawGizmosSelected(). You can rename it to OnDrawGizmos() if you want it displayed all the time instead.

help_seeker · Mar 04, 2017 at 01:32 PM 0

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hey man can i restrict two navmesh agents to follow two specific paths? if possible please share a piece of code then

DarshanP · Aug 04, 2017 at 10:54 AM 0

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How to leave the line permanently and not make it disappear as the character follows the path.

Answer 2

Answer by MrCam · Feb 19, 2019 at 02:32 PM

Complementing TakuanDaikon's answer, at line 20 you can just: linerenderer.setPositions(path.corners)

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Answer 3

Answer by mukundrungta · Jun 26, 2016 at 06:00 AM

T$$anonymous$$s is not working... can you explain me why ? Where to call t$$anonymous$$s function from because adding t$$anonymous$$s function doesnot show me any path being drawn? Please reply asap... t$$anonymous$$s is very urgently required.

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kyrnal · Aug 02, 2016 at 11:18 PM 0

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You need to SetDestination for your NavMeshAgent. Using the example above as reference, you need to add this:

nav.SetDestination(transform.position);

Kr8vKhan · Aug 02, 2017 at 11:00 AM 0

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This code seems to be a bit old, compared to the current C# version.

This is why it is not working.

You can try to change a few syntax to get it running again, I guess.

Draw path along Navmesh agent path

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