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constraint early out for small differences

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liabru 2014-03-31 11:22:20 +01:00
parent e88e94dde7
commit 365152df6e
1 changed files with 15 additions and 9 deletions
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24
src/constraint/Constraint.js
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@ -18,6 +18,7 @@ var Constraint = {};
(function() { (function() {
var _minLength = 0.000001, var _minLength = 0.000001,
_minDifference = 0.001,
_nextId = 0; _nextId = 0;
/** /**
@ -116,7 +117,11 @@ var Constraint = {};
var difference = (currentLength - constraint.length) / currentLength, var difference = (currentLength - constraint.length) / currentLength,
normal = Vector.div(delta, currentLength), normal = Vector.div(delta, currentLength),
force = Vector.mult(delta, difference * 0.5 * constraint.stiffness); force = Vector.mult(delta, difference * 0.5 * constraint.stiffness);
// if difference is very small, we can skip
if (Math.abs(1 - (currentLength / constraint.length)) < _minDifference)
return;
var velocityPointA, var velocityPointA,
velocityPointB, velocityPointB,
offsetA, offsetA,
@ -232,18 +237,19 @@ var Constraint = {};
var body = bodies[i], var body = bodies[i],
impulse = body.constraintImpulse; impulse = body.constraintImpulse;
if (impulse.x !== 0 || impulse.y !== 0 || impulse.angle !== 0) { // update geometry and reset
// update geometry Vertices.translate(body.vertices, impulse);
Vertices.translate(body.vertices, impulse);
if (impulse.angle !== 0) {
Vertices.rotate(body.vertices, impulse.angle, body.position); Vertices.rotate(body.vertices, impulse.angle, body.position);
Axes.rotate(body.axes, impulse.angle); Axes.rotate(body.axes, impulse.angle);
Bounds.update(body.bounds, body.vertices);
// reset body.constraintImpulse
impulse.x = 0;
impulse.y = 0;
impulse.angle = 0; impulse.angle = 0;
} }
Bounds.update(body.bounds, body.vertices);
impulse.x = 0;
impulse.y = 0;
} }
}; };