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  Simple steering behaviour vector help  (Read 1815 times)
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Offline javac

Junior Newbie

« Posted 2007-10-12 13:57:58 »

Hi guys,

If i was to have a 2d pitch and wanted to move a player(circle) towards a target on the pitch, how would you program this behaviour?

desired_velocity = normalize (position - target) * max_speed
steering = desired_velocity - velocity

I have vectors for both position and velocity. Basically an object that holds a float for both x and y. How would I then go about writing this? Huh

Any help greatly appreciated,

Offline broumbroum

Junior Devvie

« Reply #1 - Posted 2007-10-12 15:32:10 »

Sorry but I can't figure out your request. What do you mean with steering ? Is that a sort of Pathfinding ?

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Offline SimonH
« Reply #2 - Posted 2007-10-12 15:39:48 »

Is this what you need:

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Offline dishmoth
« Reply #3 - Posted 2007-10-12 15:46:06 »

Looks like you're pretty close to the answer already!  You should use "normalize(target - position)" though (rather than "position - target") so that the player moves towards the target, not away from it.

The player then accelerates in the direction of your "steering" vector.  For this you'd write something like
velocity = velocity + acceleration * normalize(steering)
where "acceleration" is the amount by which the player's velocity can change in one turn.

Be warned that this approach may have some odd side-effects!  In particular, the player may go into orbit around the target!  With a bit of experimentation (and, possibly, some friction) you should be able to make it do what you want though.

I hope that's some help.  Apologies if I misunderstood your question.


Offline javac

Junior Newbie

« Reply #4 - Posted 2007-10-12 16:14:21 »

Yes! Thank you!!

I stumbled on through and managed to knock up all of the vector maths for my classes and got the seek behaviour to work. I was so confused as to why it wasn't working as I thought it should. Read your post and realised I was taking away the wrong one lol. Position - target was the problem.

Thanks so much, you just made me a very happy steering behaviour enthusiast  Cool

P.s thanks again Smiley
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