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phetsims / collision-lab

"Collision Lab" is an educational simulation in HTML5, by PhET Interactive Simulations.
GNU General Public License v3.0
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Assertion failed: invalid elapsedTime: -0.008109736006644663 #81

Closed brandonLi8 closed 4 years ago

brandonLi8 commented 4 years ago 
https://bayes.colorado.edu/continuous-testing/ct-snapshots/1590696091459/collision-lab/collision-lab_en.html?continuousTest=%7B%22test%22%3A%5B%22collision-lab%22%2C%22fuzz%22%2C%22unbuilt%22%5D%2C%22snapshotName%22%3A%22snapshot-1590696091459%22%2C%22timestamp%22%3A1590700249472%7D&brand=phet&ea&fuzz&memoryLimit=1000
Query: brand=phet&ea&fuzz&memoryLimit=1000
Uncaught Error: Assertion failed: invalid elapsedTime: -0.008109736006644663
Error: Assertion failed: invalid elapsedTime: -0.008109736006644663
at window.assertions.assertFunction (https://bayes.colorado.edu/continuous-testing/ct-snapshots/1590696091459/assert/js/assert.js:22:13)
at Path.updatePath (https://bayes.colorado.edu/continuous-testing/ct-snapshots/1590696091459/collision-lab/js/common/model/Path.js:97:15)
at CollisionDetector.collideBalls (https://bayes.colorado.edu/continuous-testing/ct-snapshots/1590696091459/collision-lab/js/common/model/CollisionDetector.js:167:18)
at CollisionDetector.handleAllBallToBallCollisions (https://bayes.colorado.edu/continuous-testing/ct-snapshots/1590696091459/collision-lab/js/common/model/CollisionDetector.js:100:16)
at CollisionDetector.step (https://bayes.colorado.edu/continuous-testing/ct-snapshots/1590696091459/collision-lab/js/common/model/CollisionDetector.js:64:10)
at Explore2DModel.stepManual (https://bayes.colorado.edu/continuous-testing/ct-snapshots/1590696091459/collision-lab/js/common/model/CollisionLabModel.js:192:28)
at Explore2DModel.stepForward (https://bayes.colorado.edu/continuous-testing/ct-snapshots/1590696091459/collision-lab/js/common/model/CollisionLabModel.js:217:24)
at listener (https://bayes.colorado.edu/continuous-testing/ct-snapshots/1590696091459/collision-lab/js/common/view/CollisionLabTimeControlNode.js:54:27)
at TinyEmitter.emit (https://bayes.colorado.edu/continuous-testing/ct-snapshots/1590696091459/axon/js/TinyEmitter.js:69:53)
at https://bayes.colorado.edu/continuous-testing/ct-snapshots/1590696091459/axon/js/Emitter.js:33:29
id: Bayes Chrome
Snapshot from 5/28/2020, 2:01:31 PM
brandonLi8 commented 4 years ago

This seems to happen when the step forward button is pressed.

brandonLi8 commented 4 years ago

For some reason, when I a stepped the sim forward, this error came up. But now, I can't seem to reproduce.

brandonLi8 commented 4 years ago

I figured it out. When the balls are placed on top of each other, the physics engine tries to reconstruct it, but since the time is just starting, it ends up being a negative value. fixing.

brandonLi8 commented 4 years ago

fixed in the commit above. Will reopen if it pops up again.