A* Pathfinding Waypoints (aarku?)

I've been reading up on A* and have some questions regarding this post from aarku:

http://forum.otee.dk/viewtopic.php?t=159&start=0&postdays=0&postorder=asc&highlight=pathfinding

How would you have the nodes automatically "find" each other on startup? Is there a script attached to each that references all other nodes so they cast a ray (edge?) in the correct direction? Does each node have an individual name or are they possibly referenced by location only?

It seems that with a decent amount of nodes you would have very long scripts and lots of manual setup if that is the case. Anybody have any advice?

I'm also curious if you went any further with your pathfinding aarku.

 

Hmm, I am getting this error:

Assets/AutoWayPoint.js(40) error BCE0019: 'length' is not a member of 'Boo.Lang.List'.

For this line of code:

if (waypoints.length == 0)

 

Strange, still getting the same error (only with capitalized 'Length' in the log) after changing to:

if (waypoints.Length == 0)

I'm using 1.2.2, any ideas?

 

The script Joe posted is a JavaScript file not a Boo file. The error thinks it's boo. Perhaps you created a new Boo script and pasted it in instead of a new javascript? Either way, try just throwing the exact .js file Joe posted right into your project folder after changing the lenth to Lenth and then try it. (make sure to delete the old one.)

-Jeremy

 

hey jeremy

it is a JS file (i did have to rename the download file itself from autowaypoint_121.js to AutoWayPoint.js though), but just to be sure i deleted it, fixed the 'L' in the original download and am still getting that error. is there something else that could be wrong?

 

Weird. Does the error still say Boo.Lang.List? If so it seems convinced that it's a Boo file. Joe would have to answer there.

You could try creating a new js file in Unity, then pasting the code into it and making that change and see if you still get that error.

EDIT: Also, in js it shouldn't matter what you name the file.

-Jeremy

 

yep same error, also tried the cut and paste as well.

hmm, it gave me errors when i renamed the file. i don't remember exactly what it was but i think it said 'AutoWayPoint' is an invalid type (although i don't understand all of the script, it looks like it is referencing the other node instances so that made sense to me).

well thanks for your help - i'm off to sleep now : )

 

The Unity javascript implementation is actually based on the Boo runtime, so it uses the Boo.Lang.List class for its lists.

As Boo.Lang.List inherits from .Net's ArrayList the attribute for getting the lenght is Count and not Length. (Why .Net uses different attributes for Arrays and ArrayLists is beyond me.)

So it should read

Code (csharp):

1.  
2. if (waypoints.Count)
3.  

 

thank you, i'll try to get it working now.

 

ok, i set up an AutoWayPoint prefab:

-empty GO
-box collider with is trigger checked
-AutoWayPoint.js

and placed a few in the scene. when i click on any/all of them i do not get the connecting lines. i do see a quick log line flash which says something like:

Relative Movement (x:0.00000,x:0.00000,z:0.00000)

sorry to keep bothering you, am i doing something wrong?