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fix inertia change in Body.setMass, closes #378

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liabru 2017-11-25 14:11:53 +00:00
parent 894c1efeee
commit f7d18779be
1 changed files with 6 additions and 2 deletions
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8
src/body/Body.js
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@ -275,19 +275,23 @@ var Axes = require('../geometry/Axes');
}; };
/** /**
* Sets the mass of the body. Inverse mass and density are automatically updated to reflect the change. * Sets the mass of the body. Inverse mass, density and inertia are automatically updated to reflect the change.
* @method setMass * @method setMass
* @param {body} body * @param {body} body
* @param {number} mass * @param {number} mass
*/ */
Body.setMass = function(body, mass) { Body.setMass = function(body, mass) {
var moment = body.inertia / (body.mass / 6);
body.inertia = moment * (mass / 6);
body.inverseInertia = 1 / body.inertia;
body.mass = mass; body.mass = mass;
body.inverseMass = 1 / body.mass; body.inverseMass = 1 / body.mass;
body.density = body.mass / body.area; body.density = body.mass / body.area;
}; };
/** /**
* Sets the density of the body. Mass is automatically updated to reflect the change. * Sets the density of the body. Mass and inertia are automatically updated to reflect the change.
* @method setDensity * @method setDensity
* @param {body} body * @param {body} body
* @param {number} density * @param {number} density