You might normalize the direction vector before setting the random velocity.
Mike ----- Original Message ----- From: "Justin Couch" <[EMAIL PROTECTED]> To: <[EMAIL PROTECTED]> Sent: Thursday, December 26, 2002 9:43 PM Subject: [JAVA3D] Generating Spherical distributions > Hoping I can get a bit of help because my brain is fried :( > > I'm putting together a particle system to generate an explosion. I'd > like a spherical distribution on the generated particles but can't seem > to get the maths right to do it. I'm using the following initialisation > of the emitter: > > rnd = 1 - randomiser.nextFloat() * variation; > > float x_sign = randomiser.nextBoolean() ? 1 : -1; > float y_sign = randomiser.nextBoolean() ? 1 : -1; > float z_sign = randomiser.nextBoolean() ? 1 : -1; > > float v_x = rnd * velocity * randomiser.nextFloat() * x_sign; > float v_y = rnd * velocity * randomiser.nextFloat() * y_sign; > float v_z = rnd * velocity * randomiser.nextFloat() * z_sign; > > particle.velocity.set(v_x, v_y, v_z); > > Visually the output looks like a cube - not exactly what I'm after. :( > Any hints on how to generate a proper sphere-looking output. > > -- > Justin Couch http://www.vlc.com.au/~justin/ > Java Architect & Bit Twiddler http://www.yumetech.com/ > Author, Java 3D FAQ Maintainer http://www.j3d.org/ > ------------------------------------------------------------------- > "Humanism is dead. Animals think, feel; so do machines now. > Neither man nor woman is the measure of all things. Every organism > processes data according to its domain, its environment; you, with > all your brains, would be useless in a mouse's universe..." > - Greg Bear, Slant > ------------------------------------------------------------------- > > =========================================================================== > To unsubscribe, send email to [EMAIL PROTECTED] and include in the body > of the message "signoff JAVA3D-INTEREST". For general help, send email to > [EMAIL PROTECTED] and include in the body of the message "help". =========================================================================== To unsubscribe, send email to [EMAIL PROTECTED] and include in the body of the message "signoff JAVA3D-INTEREST". For general help, send email to [EMAIL PROTECTED] and include in the body of the message "help".
