Orion v4 beta - Pinch Detection

[julienkay]

Hi guys, I just tried the new Orion v4 and I must say the update has some very neat improvements. Individual fingers are detected much better. Rocking out in VR finally works flawlessly.

\m/(><)\m/

Hovewer I had some issues with the correct detection of pinches for example in the paint demo. When I have my hand like this, a pinch is detected fine:

When I have my hand like this, pinch detection doesn't work very well:

The issue can also be seen very well on the virtual hand model in the application, because the hand model won't have the thumb and index finger connected when using the way of pinching shown in the second picture. I think it could be hard for an end-user to understand what he's doing wrong. Even for me as a developer it was hard at the beginning to figure out, why pinching was sometimes not working. I'd almost call it a regression compared to the behaviour of the previous version.

@AlexColgan Hope you can pass this on to the team, or give some insight on whether you've encountered this issue in internal tests

As I said, the other improvements of the update are still impressive. Well done!

[nbenson]

I can't help but notice that you're pinching without splaying out your other three fingers, which isn't proper "Safety Pinch" form!

Can you confirm that your woes are from a lack of pinch distance, and not that you're doing a closed-fist pinch instead of an open-hand pinch? (The Paint Tutorial bot explains proper pinching form at the beginning of the tutorial, if my explanation is unclear)

The PinchGesture our Paint application uses calls these extra checks the "Safety Checks", and they rely on the upward angle of your middle and ring fingers in addition to what your index finger and thumb are doing.

[nbenson]

If you press F12 in the Paint application, you'll get a menu on the application window that you can use to tweak some of the parameters of your pinch detection as well. I'd love to see which settings produce more reliable pinching for you. Hands come in a lot of shapes and sizes so the more testing we get in the wild, the better