Screen flashes or goes blank when object passes over focal point. #399
Comments
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I could not reproduce this on my iPad6 with iPadOS 15.3. After updating to iPadOS 15.4, I still cannot reproduce it. So I can't do anything here. @KatieWoe I'm afraid I'll have to assign this back to you to reproduce. If you can't make it happen again, then I think we should close this issue. |
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I wasn't able to reproduce on the iPad Air 2 with iPadOS 15.3. |
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Discussed with @arouinfar, and we agree that it seems reasonable to close this issue as "won't fix", since it cannot be reproduced. |
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I saw this again in phetsims/qa#799. On iPad but not xhtml. Still not sure of the cause, but reopening in case this needs another look. |
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I've managed to reproduce it a few times. I think what might be happening is, if you set a point down on the focus point (the tip of the pencil in the case in the video) then pick it up and drag it over that point the flashing behavior occurs. This may just be on iPads. |
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@KatieWoe are you seeing this with the same device that you originally reported this problem? Or is this a different iPad? |
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This is a different iPad, but with the same OS |
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I cannot reproduce this on my iPad6 with iPadOS 15.4, running the XHTML version https://phet-dev.colorado.edu/html/geometric-optics/1.2.0-dev.1/phet/xhtml/geometric-optics_all.xhtml. I tried putting the tip of the pencil on the left focal point, then dragging the object across/around the left focal point. |
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@arouinfar @KatieWoe thoughts on how to proceed with this issue? This was previously closed as "won't fix", but @KatieWoe reopened it because she's seeing it on another iPad. |
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I'm willing to pair at some point if you think it would help. Even though I managed to reproduce it 3 or 4 times, it often takes awhile and I'm not incredibly confident on how it is done. Sorry about that. |
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What is the model of the 2 iPads on which you've seen this problem? The model can be found in Settings > General > Model Name. |
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One is an iPad Air 2. The other is a newer model, but I don't remember exactly what. It is currently with @kathy-phet |
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I am fine with closing this as wont-fix, and it's already been documented in the teacher tips. Up to @pixelzoom if you would like to do more investigation to better understand the issue, though. |
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Closing again as "won't fix". |
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For phetsims/qa#938 I am seeing this issue with macOS 13.3.1 + safari 16.3. The screen will briefly flash (and sometimes goes blank) when I move an object past the focal point on the Lens Screen. This only happens in safari and only with keyboard nav. Steps:
screenflash.mp4
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Reopening for re-evaluation. |
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Thanks @Nancy-Salpepi. From my understanding, this happens because the image is formed at infinity when an object is placed precisely at the focal point. I don't believe there is anything we can do here. Since the behavior exists in published, is documented in the Teacher Tips, and hasn't been reported by users, we can continue to do nothing here. @pixelzoom feel free to close if you agree. |
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Since #399 (comment) reports that the screen goes totally blank, not just flashes, I think it's worth investigating a bit. My guess is that there's some math operation involving infinity that causes the browser to behave badly on certain platforms. That said... I cannot reproduce #399 (comment) with macOS 13.2.1 + Safari 16.3. I'll update to macOS 13.3.1 + Safari 16.3 (the reported configuration) and try again. |
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I upgraded to macOS 13.3.1 + Safari 16.3 and could not reproduce with master or published (1.1.10). @Nancy-Salpepi what device are you using to test this? I'm especially interested in the processor type. |
pixelzoom
changed the title
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@KatieWoe Since @Nancy-Salpepi is out, do you have info on her test machine that was used to report #399 (comment)? Do you know if it's Intel or M1/M2 ? |
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I believe it is M1, but I'm not sure and could very well be wrong. I'm sorry. |
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Looking at other issues that @Nancy-Salpepi has created lately, the device reported in the issue template is "MacBook Air M1 chip". So I'm guessing that this issue was reported with same device. Since I have an Intel processor and cannot reproduce, I'll bet that this is specific to M1. |
pixelzoom
changed the title
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This is not blocking for the 1.3 release #278, or for creating the 1.3 release branch. If it's not addressed before publishing 1.3, it will be moved back to the "deferred" state, to be investigated in a future release. |
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@KatieWoe Do you access to both Mac Intel and Mac M1 test devices? If so, please test using steps in #399 (comment) on both devices, and verify that this is only reproducing on the M1 device. |
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Unfortunately not, Nancy's is the only one we have. |
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This was not resolved before creating the Geometric Optics 1.3 release branch. Labeling as deferred to revisit for a future release. |
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@Nancy-Salpepi when you return, please verify what test device (processor) was used for #399 (comment). Then you can unassign this issue. |
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For #399 (comment) I was using a MacBook Air M1 (macOS 13.3.1 and safari 16.3). I also tested GO 1.3.0-rc.2 with my iMac desktop and saw the flashing when using the arrow keys and WASD keys, but the screen didn't go blank in the time I tested. |
For phetsims/qa#787. This was seen on iPadOS 15.4 in the XHTML sim. However, I haven't been able to reproduce, even on the same device after the page was reloaded. As such, I'm not sure if this is device or XHTML specific.
When dragging the pencil object over the focal point in the first scene on the first screen, the screen would go completely blank while the object passed/rested over that point. I'm sorry I haven't been able to reproduce. If I see it again or find a good way to reproduce it I will update this issue.
IMG_0098.MOV
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