Implementation of the user task

[mathiassand]

It needs to be clear to the user how to grab the ball - e.g. the egg example. Here's a very pretty example.

We would probably have to keep the ball at it's current state as it might be complicated to design af new ball (implementation wise). We could also consider rotating the task object, so that the user grabs the egg/ball from below. Making the ball small could make the grasp/pinch feel more natural.

For pilot testing: Applying pressure/force. Below threshold the ball sleeps, within threshold you can grab/pinch the ball. above threshold the ball breaks.

[kuff]

I would advise that we strongly encourage the user to grab the ball from below, as discussed during our meeting, as grabbing from above may occlude the fingers from the sensor, which is built in to the headset and would therefore be on a declining viewing angle:

[mathiassand]

I have sketched a bit to see how we explicitly make the object afford to grab from below. It's just some initial sketches to get the ball rolling, whereas some ideas might be more complex to implement than others, but we can always "dumb" them down. Let me know what you think @kuff @MartinGarenfeld

[kuff]

Looks interesting, have you shown them to @hendrikknoche ?

[MartinGarenfeld]

I think that it should be as simple as possible. The fewer interesting visuals we include, the less distracted the participant will be and more attention will be put on the tactile feedback. But I definitely see the point of making the scenario into a relevant scenario and I really like the ideas. But I would go with Mathias' suggestion to "dumb" it down a notch.

[MartinGarenfeld]

By the way, I need to ship one of the gloves to a Tactility partner for them to use to collect data from the last participants in the brushstroke experiment. They have overused their glove and the electrode connection is now loose. I need the largest one of the two. Can you please assess which one is larger and then maybe leave it at Mathias' desk? Then I will pick it up on Monday, if it works for you?

[mathiassand]

I have a glove on my desk, but I don't know if it's the larger of the two. Can you compare them @kuff?

[kuff]

Will be back home sometime Sunday. How do I compare them?

[MartinGarenfeld]

You can just try them on and select the one you think is more "loose".

[mathiassand]

The ball is attached magnetically to this rod in the middle of the box, where the user needs to pinch in order to loosen it.

Currently I have implemented the following task (it's lagging a bit due to my PC and the airlink to the VR headset connection):

https://user-images.githubusercontent.com/25637660/215505702-471e80b0-c42b-489e-97cc-8f3ca137dfc0.mp4

I'm using pressureThreshold which controls the conditions. > 0.2 and <= 0.55 user can take the ball, above 0.55 the ball will be destroyed.

[MartinGarenfeld]

Great work! Looks very nice. Is it coupled with the tactile feedback?

I did not pick up the glove today because I caught a stomach infection. I might not be able to go tomorrow either. Can you please tell me the room number, so I can send Mauri instead?

[mathiassand]

I haven't tried it with the tactile feedback, no - something we still need to do - I am yet to try the tactile feedback with VR actually.

Hope you have a speedy recovery, Martin! The room is 5-353 (3rd floor, level 5).

[kuff]

Largely implemented since https://github.com/med-material/vrtactility/commit/123e67e8c52bb84ec8c9a4bea1f0d81802724996. Now just missing the constraint enforcing the user to grab from bellow.