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Reversing Velocity
http://45.55.195.193/viewtopic.php?f=73&t=15272		 Page 1 of 2
Author:  Siric [ Tue Jun 09, 2009 7:51 am ]
Post subject:  Reversing Velocity
How would you make Pixels/MOSrotatings in a Certain radius go in the Opposite Direction they were originally going?
Author:  Grif [ Tue Jun 09, 2009 7:53 am ]
Post subject:  Re: Reversing Velocity
if math.abs(target.Pos.X - self.Pos.X) < 30 and math.abs(target.pos.Y - self.Pos.Y) < 30 then
target.Vel = target.Vel * -1;
end
Author:  mail2345 [ Tue Jun 09, 2009 7:55 am ]
Post subject:  Re: Reversing Velocity
Code:
for particle in MovableMan.Particles
do
 if math.sqrt(math.pow((particle.Pos.X-self.Pos.X),2) + math.pow((particle.Pos.Y - self.Pos.Y),2)) < <radius> then
particle.Vel = Vector(particle.Vel.X * -1, particle.Vel.Y * -1)
end
end

EDIT:
Got ninjaed by grif.

Wait, you can multiply vectors?
Author:  Siric [ Tue Jun 09, 2009 7:58 am ]
Post subject:  Re: Reversing Velocity
Thanks Grif, I will try that.
Author:  CrazyMLC [ Tue Jun 09, 2009 8:57 am ]
Post subject:  Re: Reversing Velocity
Nice shield code.

Would want to make it
f math.abs(target.Pos.X - self.Pos.X) < 30 and math.abs(target.pos.Y - self.Pos.Y) < 30 then
target.Vel = target.Vel * -0.3;
Author:  Geti [ Tue Jun 09, 2009 9:06 am ]
Post subject:  Re: Reversing Velocity
why is everyone using freaking Pythagoras when there is a perfectly good vector.Magnitude variable?
seriously, math.abs(self.Pos.Magnitude - particle.Pos.Magnitude) works brilliantly.
Author:  CrazyMLC [ Tue Jun 09, 2009 9:07 am ]
Post subject:  Re: Reversing Velocity
I wish I understood that.
Does that basically make it stop?
Author:  piipu [ Tue Jun 09, 2009 9:36 am ]
Post subject:  Re: Reversing Velocity
Geti wrote:
why is everyone using freaking Pythagoras when there is a perfectly good vector.Magnitude variable?
seriously, math.abs(self.Pos.Magnitude - particle.Pos.Magnitude) works brilliantly.

I believe the reason for this is because triangles don't work that way.
Image
Lets say we have two objects, the coordinates of which are (0,100) and (300,0). Your method gives a distance of (300 - 100) = 200. Pythagoras gives us the real distance which is sqrt((300 - 0) ^ 2 + (0 - 100) ^ 2) = 316.227766... which is not 200.
Author:  Siric [ Tue Jun 09, 2009 12:27 pm ]
Post subject:  Re: Reversing Velocity
None of the Code Snippets worked, No errors in the console, I have no idea whats wrong.
Author:  piipu [ Tue Jun 09, 2009 1:34 pm ]
Post subject:  Re: Reversing Velocity
That's maybe because the radius of the effect is too small, the velocity gets reversed again the next frame, or there's something else wrong with your shield. If the script is directly attached to the shield, it will only work if the shield is not held by anyone.
Author:  Siric [ Tue Jun 09, 2009 1:36 pm ]
Post subject:  Re: Reversing Velocity
piipu wrote:
If the script is directly attached to the shield, it will only work if the shield is not held by anyone.

Is it possible to make it work while held?
Author:  CrazyMLC [ Tue Jun 09, 2009 1:38 pm ]
Post subject:  Re: Reversing Velocity
I don't think so, its the same deal with guns, you can't touch them when they're on an actor.
Author:  Siric [ Tue Jun 09, 2009 1:44 pm ]
Post subject:  Re: Reversing Velocity
What if I added a Null sprited attachment and ran the script on it?
I forget if you can put attachments on HeldDevices.
Author:  CrazyMLC [ Tue Jun 09, 2009 1:45 pm ]
Post subject:  Re: Reversing Velocity
Nice Idea.
I think that would work, if not, you could also have an emitter on it, and apply the code to the MOPixels.
Author:  piipu [ Tue Jun 09, 2009 1:53 pm ]
Post subject:  Re: Reversing Velocity
The script needs to be in something that's not attached to anything. CC can't run lua from attachables at the moment.
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