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Topic: beginner particle systems? (Read 3647 times) |
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lunetta
 
 
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beginner particle systems?
« on: Mar 31st, 2005, 5:39am » |
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Hi
I need to build some example-sketches for my projects with particle systems;
I need to build "simple" things; particle field responding to a gravity pole, or to a repeller pole, or assuming a certain shape like a circle.
I have already seen a lot of examples like this around; but I browsed around and could only find much much more complex stuff.
Does anyone has recommendations of sketches or theory pages to point me to?
Really Grateful for any link
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kurol
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Re: beginner particle systems?
« Reply #1 on: Mar 31st, 2005, 10:03am » |
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I'm new to this too, I think this tutorial (also found on tutorial page) is a good starting place if you're a n00b like me.
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I hate programming . . .  
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st33d
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Re: beginner particle systems?
« Reply #2 on: Mar 31st, 2005, 3:42pm » |
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Eskimoblood pointed me to a lingo script that could be deciphered to create gravity effects.
The trick seemed to be concentrating on the x and y acceleration separately and leaving a space around the mouse where gravity is killed so the particle isn't accelerated too hard.
Code:
particle [] p = new particle [10];
void setup(){
for(int i = 0; i < p.length; i++){
p[i] = new particle(random(400),random(400),random(10));
}
size (400,400);
}
void loop(){
background (255);
for(int i = 0; i<p.length; i++){
p[i].gmove();
p[i].draw();
}
line(mouseX,0,mouseX,height);
}
class particle{
float x,y,thisMass,xVelocity;
particle (float x, float y, float thisMass){
this.x = x;
this.y = y;
this.thisMass = thisMass;
xVelocity = 0;
}
void gmove(){
float mouseMass = 5;
float distX = mouseX - x;
//introduce the y and use pythagoras for the distance with two axises
/*
float distY = mouseY - y;
float dist = sqrt(sq(distX) + sq(distY));
*/
float dist = abs(distX); //remove this line for two axises
//kill acceleration to create an orbit if too near mouse
if (dist < 15){
dist = 15;
}
//gravity equations - x axis only so you can pick it apart
float grav = (thisMass * mouseMass) / sq(dist) * 5;
float xGrav = grav * (distX/dist);
float xAccel = xGrav / thisMass;
xVelocity += xAccel;
x += xVelocity;
/*
float yGrav = grav * (distY/dist);
float yAccel = yGrav / thisMass;
yVelocity += yAccel;
y += yVelocity;
*/
}
void draw(){
ellipse(x-5,y-5,10,10);
}
}
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| « Last Edit: Mar 31st, 2005, 3:45pm by st33d » |
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I could murder a pint.
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lunetta
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Re: beginner particle systems?
« Reply #3 on: Mar 31st, 2005, 4:24pm » |
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nice! thanks
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kurol
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Re: beginner particle systems?
« Reply #4 on: Mar 31st, 2005, 10:15pm » |
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Here's my 1st attempt at making a class and particles.
particleman
When you click around the black box, particles will start ejecting from the mouse cursor.
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I hate programming . . .
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st33d
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Re: beginner particle systems?
« Reply #5 on: Mar 31st, 2005, 11:25pm » |
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Top dollar. I may have to try implementing that Kurol. I've been wondering how to get some fun action out of my motion reactive particles below. A bouncy spawner would be cool.
http://www.st33d.net/processing/mfeed.pde
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I could murder a pint.
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