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Formula for spherical explosion...

Started by ThunderSoul Jun 22, 2010 at 6:27 AM 1 replies 1k views

Original Post

Jun 22, 2010 at 6:27 AM

Hi guys!
I'm looking for the formula for a spherical explosion (particles expanding like a sphere). I'm currently using:

public void pickDirection()
{
float angle = random(0, MathHelper.TwoPi);
float zAngle = random(-MathHelper.PiOver2, MathHelper.PiOver2);

return new Vector3((float)Math.Cos(angle), (float)Math.Sin(angle), (float)Math.Tan(zAngle));
}

I know this isn't right since the explosion isn't spherical... :(
Help?

Thank you!
-TS...

emiel1

Jun 22, 2010 at 6:50 AM

Your function pickDirection() must return a random direction with an equal probability of choosing one vector or another. The standard (and fastest) way of doing this is (I hope this correct C# code, as I code C++):

float z = random(-1.0, 1.0);float f = Math.sqrt(1.0 - z * z);float azimuth = random(0.0, MathHelper.TwoPi);return new Vector3(Math.Cos(azimuth) * f, Math.Sin(azimuth) * f, z);

See this post (http://www.gamedev.net/community/forums/topic.asp?topic_id=499972&whichpage=1& #3261773) (a href weirdness: remove this space in this url) for more information (warning: C++).

Emiel

ThunderSoul

Author

ThunderSoul

Jun 22, 2010 at 7:17 AM

Thank you, much appreciated! :)

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