# Collision detection code style [closed]

Not only there are two useful broad-phase algorithms and a lot of useful narrowphase algorithms, there are also multiple code styles.

Arrays vs. calling

1. Make an array of broadphase checks, then filter them with narrowphase checks, then resolve them.

function resolveCollisions(thingyStructure * a,thingyStructure * b,int index){
possibleCollisions = getPossibleCollisions(b,a->get(index));
for(i=0; i<possibleCollitionsNumber; i++){
if(narrowphase(possibleCollisions[i],a[index])) {
collisions->push(possibleCollisions[i]);
};
};
for(i=0; i<collitionsNumber; i++){
//CODE FOR RESOLUTION
};
};

2. Make the broadphase call the narrowphase, and the narrowphase call the resolution

function resolveCollisions(thingyStructure * a,thingyStructure * b,int index){
};

function broadphase(thingy * with, thingy * what){
while(blah){
//blahcode
narrowphase(what,collidingThing);
};
};

Events vs. in-the-loop

1. Fire an event. This abstracts the check away, but it's trickier to make an equal interaction.

a[index] -> collisionEvent(eventdata);

//much later

int collisionEvent(eventdata){
//resolution gets here
}

2. Resolve the collision inside the loop. This glues narrowphase and resolution into one layer.

if(narrowphase(possibleCollisions[i],a[index])) {
//CODE GOES HERE
};

The questions are: Which of the first two is better, and how am I supposed to make a zero-sum Newtonian interaction under B1.

-

## closed as not constructive by Sean Middleditch, MichaelHouse 'Byte56'♦, bummzack, Josh Petrie♦, Tetrad♦Dec 26 '12 at 4:07

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Sounds subjective. Code style questions might be better suited for the Code Review beta site. – Anko Dec 9 '12 at 0:23
"Which is better" is subjective. Better in what sense? Is there a specific problem you're trying to solve? – Tetrad Dec 26 '12 at 4:06