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optimised Resolver.postSolvePosition

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liabru 2021-04-27 00:31:34 +01:00
parent 3cf65e8051
commit 49fbfba511
1 changed files with 19 additions and 13 deletions
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32
src/collision/Resolver.js
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@ -121,34 +121,40 @@ var Bounds = require('../geometry/Bounds');
* @param {body[]} bodies
*/
Resolver.postSolvePosition = function(bodies) {
var positionWarming = Resolver._positionWarming;
for (var i = 0; i < bodies.length; i++) {
var body = bodies[i];
var body = bodies[i],
positionImpulse = body.positionImpulse,
positionImpulseX = positionImpulse.x,
positionImpulseY = positionImpulse.y,
velocity = body.velocity;
// reset contact count
body.totalContacts = 0;
if (body.positionImpulse.x !== 0 || body.positionImpulse.y !== 0) {
if (positionImpulseX !== 0 || positionImpulseY !== 0) {
// update body geometry
for (var j = 0; j < body.parts.length; j++) {
var part = body.parts[j];
Vertices.translate(part.vertices, body.positionImpulse);
Bounds.update(part.bounds, part.vertices, body.velocity);
part.position.x += body.positionImpulse.x;
part.position.y += body.positionImpulse.y;
Vertices.translate(part.vertices, positionImpulse);
Bounds.update(part.bounds, part.vertices, velocity);
part.position.x += positionImpulseX;
part.position.y += positionImpulseY;
}
// move the body without changing velocity
body.positionPrev.x += body.positionImpulse.x;
body.positionPrev.y += body.positionImpulse.y;
body.positionPrev.x += positionImpulseX;
body.positionPrev.y += positionImpulseY;
if (Vector.dot(body.positionImpulse, body.velocity) < 0) {
if (positionImpulseX * velocity.x + positionImpulseY * velocity.y < 0) {
// reset cached impulse if the body has velocity along it
body.positionImpulse.x = 0;
body.positionImpulse.y = 0;
positionImpulse.x = 0;
positionImpulse.y = 0;
} else {
// warm the next iteration
body.positionImpulse.x *= Resolver._positionWarming;
body.positionImpulse.y *= Resolver._positionWarming;
positionImpulse.x *= positionWarming;
positionImpulse.y *= positionWarming;
}
}
}