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Line to point response

Math and Physics Programming

Started by FreeDebreuil October 08, 2005 10:15 AM

5 comments, last by FreeDebreuil 18 years, 6 months ago

FreeDebreuil

144

Author

October 08, 2005 10:15 AM

I'm doing a simple 2d physics engine and I'm trying to get a point to bounce off a line. I already know which line it is hitting, all the angles, ect... Any help appreicated (btw, my angles go ccw).

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Zakwayda

2,389

October 08, 2005 10:34 AM

Generally this sort of thing is done with vector math rather than angles and trig. A simple way to 'bounce' an object is to reflect the velocity vector about the line (or plane in 3d) normal. The equation for vector reflection is:

v' = v - 2(v.n)n

Where n is the unit-length normal.

FreeDebreuil

144

Author

October 09, 2005 10:07 AM

hmmm, guess I'll convert the angle into a vector... Thanks!

464

October 09, 2005 09:03 PM

ToyBox 2D physics engine code/exe

Check out PhysicsEngine/PhysicalObject.cpp and look at the collisionResponse function for falling object. Do your bounces like that.

FreeDebreuil

144

Author

October 10, 2005 06:58 PM

Thanks, you made that engine...?

464

October 10, 2005 07:03 PM

Yes, and I'm still hacking away on it. :-D It's been in serious development for about 6 months off and on.

FreeDebreuil

144

Author

October 11, 2005 05:03 PM

nice, hopefully I can make something around that level :D

This topic is closed to new replies.

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