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phetsims / wave-interference

"Wave Interference" is an educational simulation in HTML5, by PhET Interactive Simulations.
MIT License
19 stars 5 forks source link

Waves no longer appear properly at high frequencies #503

Closed DevonQui closed 4 years ago

DevonQui commented 4 years ago

Test device MacBook Pro

Operating System Catalina 10.15.1

Browser Safari

Problem description This is for https://github.com/phetsims/QA/issues/511 For the light and sound wave simulations, the waves will begin to stick together at the wave origin when the wave frequency is high. Fortunately, I was unable to produce this in the Water Wave simulation although the visuals might be considered a little strange at high frequencies.

Steps to reproduce

  1. Open the simulation
  2. Click on the Sound (or Light) section of the simulation
  3. Make sure you have the automatic wave generator on (left-side right underneath the wave generator)
  4. Click on the green button on the wave generator to get the waves started
  5. Begin to repeatedly and quickly click the green button and observe how the waves stick together at the origin.

Visuals https://drive.google.com/file/d/1PUQCvshi46zIAjvQEtjLT1aZqZA0GVOr/view?usp=sharing

Troubleshooting information: !!!!! DO NOT EDIT !!!!! Name: ‪Waves Intro‬ URL: https://phet-dev.colorado.edu/html/waves-intro/1.1.0-dev.24/phet/waves-intro_all_phet.html Version: 1.1.0-dev.24 2020-10-13 16:44:23 UTC Features missing: touch Flags: pixelRatioScaling User Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_1) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/13.0.3 Safari/605.1.15 Language: en-US Window: 1260x720 Pixel Ratio: 2/1 WebGL: WebGL 1.0 GLSL: WebGL GLSL ES 1.0 (1.20) Vendor: WebKit (WebKit WebGL) Vertex: attribs: 16 varying: 15 uniform: 1024 Texture: size: 16384 imageUnits: 16 (vertex: 16, combined: 16) Max viewport: 8192x8192 OES_texture_float: true Dependencies JSON: {}

KatieWoe commented 4 years ago

Noting that this happens in the published sim as well. It also only happens from using the continuous wave setting, as the pulse button is disabled when pressed until a full wave has been created.

samreid commented 4 years ago

I believe we discussed this problem as part of https://github.com/phetsims/wave-interference/issues/316#issuecomment-454458763 and were aware that it was a disadvantage of the temporal masking approach. @arouinfar or @ariel-phet do you have a clearer recollection? How do you wish to proceed?

arouinfar commented 4 years ago

If I remember correctly, the temporal masking was introduced to smooth out the graph data, intensity plot, and wave meter plots. Some concessions had to be made for reasonable performance for typically lower-performing devices. If the behavior is only present during interactions that are not pedagogically useful, such as rapidly scrubbing sliders or mashing the on/off button, then it's not an issue.

ariel-phet commented 4 years ago

@DevonQui thanks for identifying this issue, but yes, considering the compromises we have had to make for the sim to function well, coupled with this behavior not being pedagogically useful we will close as wontfix