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Verlet Integration Fix #1336

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Verlet Integration Fix #1336

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e228e7c
Fix linear velocity integration in Body.update()
noahwagner04 Apr 9, 2025
7cb531a
Build matterjs and demos
noahwagner04 Apr 9, 2025
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4 changes: 2 additions & 2 deletions build/matter.js
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Original file line number Diff line number Diff line change
Expand Up @@ -2339,8 +2339,8 @@ var Axes = __webpack_require__(11);
velocityPrevY = (body.position.y - body.positionPrev.y) * correction;

// update velocity with Verlet integration
body.velocity.x = (velocityPrevX * frictionAir) + (body.force.x / body.mass) * deltaTimeSquared;
body.velocity.y = (velocityPrevY * frictionAir) + (body.force.y / body.mass) * deltaTimeSquared;
body.velocity.x = (velocityPrevX * frictionAir) + (body.force.x / body.mass) * deltaTime * (deltaTime + body.deltaTime) / 2;
body.velocity.y = (velocityPrevY * frictionAir) + (body.force.y / body.mass) * deltaTime * (deltaTime + body.deltaTime) / 2;

body.positionPrev.x = body.position.x;
body.positionPrev.y = body.position.y;
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2 changes: 1 addition & 1 deletion build/matter.min.js
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2 changes: 1 addition & 1 deletion demo/index.html
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Original file line number Diff line number Diff line change
Expand Up @@ -73,6 +73,6 @@
<script src="./js/matter-demo.matter-wrap.f14474.min.js"></script>
<script src="./js/matter-demo.pathseg.f137cc.min.js"></script>
<script src="./js/matter-demo.poly-decomp.6b3373.min.js"></script>
<script src="./js/matter-demo.01bd65.min.js"></script>
<script src="./js/matter-demo.9b96b2.min.js"></script>
</body>
</html>
6 changes: 0 additions & 6 deletions demo/js/matter-demo.01bd65.min.js
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6 changes: 6 additions & 0 deletions demo/js/matter-demo.9b96b2.min.js
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4 changes: 2 additions & 2 deletions src/body/Body.js
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Original file line number Diff line number Diff line change
Expand Up @@ -756,8 +756,8 @@ var Axes = require('../geometry/Axes');
velocityPrevY = (body.position.y - body.positionPrev.y) * correction;

// update velocity with Verlet integration
body.velocity.x = (velocityPrevX * frictionAir) + (body.force.x / body.mass) * deltaTimeSquared;
body.velocity.y = (velocityPrevY * frictionAir) + (body.force.y / body.mass) * deltaTimeSquared;
body.velocity.x = (velocityPrevX * frictionAir) + (body.force.x / body.mass) * deltaTime * (deltaTime + body.deltaTime) / 2;
body.velocity.y = (velocityPrevY * frictionAir) + (body.force.y / body.mass) * deltaTime * (deltaTime + body.deltaTime) / 2;

body.positionPrev.x = body.position.x;
body.positionPrev.y = body.position.y;
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