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Topic: Moving along 3d bezier (Read 365 times) |
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Captain_Lobotomy
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Moving along 3d bezier
« on: Sep 9th, 2003, 10:53pm » |
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Hi,
is there a simple way of retrieving the coordinates of any point on a 3d bezier curve defined by two points and two control points?
Seeya,
Captlobo
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Captain_Lobotomy
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Re: Moving along 3d bezier
« Reply #1 on: Sep 10th, 2003, 6:42pm » |
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Oops, just found out this functionality is actually build in.
Nevr mind...
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Jerronimo
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Re: Moving along 3d bezier
« Reply #2 on: Sep 10th, 2003, 9:14pm » |
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how is this done?
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Captain_Lobotomy
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Re: Moving along 3d bezier
« Reply #3 on: Sep 10th, 2003, 9:59pm » |
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Well assume you defined a simple 3d Bezier as follows:
beginShape(LINE_STRIP);
bezierVertex(x1, y1, z1); //first point
bezierVertex(x2, y2, z2); //first control handle
bezierVertex(x3, y3, z3); //second control handle
bezierVertex(x4, y4,z4); //second point
endShape();
Then you can access any point(x,y,z) on the curve with:
x=bezier(x1,x2,x3,x4,t); //t=0..1
x=bezier(y1,y2,y3,y4,t);
x=bezier(z1,z2,z3,z4,t);
t=0 gives you the starting point, t=1 the endpoint, ..
I used this in my first ever applet:
http://users.skynet.be/frederikenhermine/
Seeya,
FVH
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pollux
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Re: Moving along 3d bezier
« Reply #4 on: Sep 10th, 2003, 11:49pm » |
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beautiful applet, i love the pace. it seems like a parallel universe...
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pollux | www.frwrd.net
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Jerronimo
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Re: Moving along 3d bezier
« Reply #5 on: Sep 11th, 2003, 4:57am » |
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neat. i didn't know about that.
the documentation has the 't' option in there (time?) but doesn't explain it. where did you learn about that use of bezier()?
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