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phetsims / faradays-electromagnetic-lab

"Faraday's Electromagnetic Lab" is an educational simulation in HTML5, by PhET Interactive Simulations.
GNU General Public License v3.0
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Should compass be above earth in layering? #181

Closed KatieWoe closed 3 weeks ago

KatieWoe commented 3 weeks ago

Test device Samsung Operating System Win 11 Browser Chrome Problem description For https://github.com/phetsims/qa/issues/1091 I think it would be a good idea for the compass to be layered above the Earth magnet. If you put it over the Earth to see where the compass would point at that spot, then try to pick it up again you end up dragging the Earth instead.

Visuals compassontop

Troubleshooting information:

!!!!! DO NOT EDIT !!!!! Name: ‪Faraday's Electromagnetic Lab‬ URL: https://phet-dev.colorado.edu/html/faradays-electromagnetic-lab/1.0.0-dev.32/phet/faradays-electromagnetic-lab_all_phet.html Version: 1.0.0-dev.32 2024-05-30 15:49:49 UTC Features missing: applicationcache, applicationcache, touch Flags: pixelRatioScaling User Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/125.0.0.0 Safari/537.36 Language: en-US Window: 1536x695 Pixel Ratio: 1.25/1 WebGL: WebGL 1.0 (OpenGL ES 2.0 Chromium) GLSL: WebGL GLSL ES 1.0 (OpenGL ES GLSL ES 1.0 Chromium) Vendor: WebKit (WebKit WebGL) Vertex: attribs: 16 varying: 31 uniform: 4096 Texture: size: 8192 imageUnits: 32 (vertex: 32, combined: 64) Max viewport: 8192x8192 OES_texture_float: true Dependencies JSON: {}
arouinfar commented 3 weeks ago

Thanks @KatieWoe. While the behavior you've reported isn't great, it's unfortunately necessary.

In https://github.com/phetsims/faradays-electromagnetic-lab/issues/10#issuecomment-1911160748, the design team decided to layer the compass behind the magnet, despite the difficulty when Earth is checked. The model is 2D and the compass measures the B-field inside the magnet. However, when the compass is on top of the magnet it implies that it is measuring the B-field just outside of the magnet which would point in the opposite direction. To avoid confusion, we chose to layer the compass behind the magnet.

Closing as wont-fix.