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Topic: boids look forward (Read 2074 times) |
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eskimoblood
 
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boids look forward
« on: Oct 14th, 2004, 10:53am » |
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I've build a boidsystem like explained here: http://www.vergenet.net/~conrad/boids/pseudocode.html
Now I'm looking for a algorithm for the second rule that alllows, that a boid only get the distance from the boids in front of them and not from them in the back. I think it has something do to with the angle between the vector of the boid and vector to the other boid.
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TomC
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Re: boids look forward
« Reply #1 on: Oct 14th, 2004, 12:56pm » |
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To find the angle between 2 vectors, you can use the dot product.
In 2d, you can use the atan2 function (built into processing). http://processing.org/reference/atan2_.html
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Fish-face
  
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Re: boids look forward
« Reply #2 on: Oct 15th, 2004, 9:22am » |
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You can also use regular trig with Math.[sin|cos|tan|asin|acos|atain]
This allows you to do other things - finding other angles, finding a distance from an angle, etc.
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--
The C@ S@ on the M@
=Fish-Face=
~#Chris#~
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