Subject: Re: [stella] which way to turn? From: Kirk Israel <kirkjerk@xxxxxxxxx> Date: Mon, 25 Jul 2005 13:58:43 -0400 |
Hmm...actually I haven't tried to hard but it was tough finding a good online description of how to calculate a cross product, and then multiply it... On 7/22/05, Aaron <stella-receiver@xxxxxxxxxxxxxxxxx> wrote: > Kirk Israel said: > > So I'm trying to get something a bit like combat biplanes. And I've > > been musing on this problem: how would I get, say, an onscreen heat > > seeking missile to work? > > > > Basically, it has to know if it should turn left or right to get to the > > target. > > Hey, I have something useful to say for once! :) > > Take the missile velocity, that's one vector. Then take the distance from > the missile to its target, that's another vector. Take their cross > product, i.e. y1*x2 - y2*x1. If it's negative, you turn one way, if it's > positive you turn the other (I forget which is which, but it should be > easy to figure out). I did this in a Palm game once and it looks cool... > > -Aaron > > Archives (includes files) at http://www.biglist.com/lists/stella/archives/ > Unsub & more at http://stella.biglist.com > > Archives (includes files) at http://www.biglist.com/lists/stella/archives/ Unsub & more at http://stella.biglist.com
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