Voicing stops when only one hand is used with ?cameraInput=hands

[Nancy-Salpepi]

Test device
MacBook Air (m1 chip)

Operating System
macOS 13.0.1

Browser
safari and chrome

Problem description
For phetsims/qa#852, when using ?cameraInput=hands, voicing only works when both hands are in view. I wasn't sure if this was intentional or not.

Steps to reproduce

1. Turn on Voicing and check Sim Voicing Options checkboxes
2. Lower one hand so it is out view and move the other up and down --no Voicing is heard
3. Raise your hand so that both are in view --Voicing returns

Troubleshooting information: !!!!! DO NOT EDIT !!!!! Name: ‪Ratio and Proportion‬ URL: https://phet-dev.colorado.edu/html/ratio-and-proportion/1.2.0-rc.1/phet/ratio-and-proportion_all_phet.html Version: 1.2.0-rc.1 2022-11-11 22:40:36 UTC Features missing: applicationcache, applicationcache, touch Flags: pixelRatioScaling User Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/107.0.0.0 Safari/537.36 Language: en-US Window: 1544x712 Pixel Ratio: 1.7999999523162842/1 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: 1024 Texture: size: 16384 imageUnits: 16 (vertex: 16, combined: 32) Max viewport: 16384x16384 OES_texture_float: true Dependencies JSON: {}

[zepumph]

There is no detection of the voicing cue with one hand. @emily-phet is this something you would like me to work on? If not, I recommend closing this issue and tracking future camera input hands work in a central spot.

[emily-phet]

@zepumph I agree. Not blocking, we should not fix at this point. In the future with more founds to focus on optimizing Camera Input: Hands, we should look into the issue further.

[zepumph]

Sounds great! I noted it in #512 (comment), and we can keep that list going for next time. Closing