4 ms·

and to think there was an api to derive pressure from contact size back in 2.0 https://developer.apple.com/library/ios/documentation/UIKit/Reference/UITouch_Cl

and to think there was an api to derive pressure from contact size back in 2.0 https://developer.apple.com/library/ios/documentation/UIKit/Reference/UITouch_Class/index.html https://developer.apple.com/library/ios/documentation/UIKit/... anyone knows any app usage of this? I remember some games had pressure calculated from the accelerometer, don't know if any did use this one instead.

Synaesthesia 11y ago
GarageBand also uses accelerometer data to try get the velocity of taps on drums it works reasonably well, not like 3D Touch of course.
sigmar 11y ago
I would love to see how closely/consistently the output from "contact size" increases with "force"
- LoSboccacc 11y ago
  I don't think is gonna be consistent among different fingers/people, sadly. but synaptic did pressure sensitivity on contact area long ago, wouldn't be surprised if they got some nice normalization heuristic already going. edit this is funny coincidence: the dev guide for synaptic says 255 level but better badn in 7 levels at most (2005) http://arstechnica.com/civis/viewtopic.php?f=9&t=352584 http://arstechnica.com/civis/viewtopic.php?f=9&t=352584 Edit: I know those are not really comparable teches, force touch for one is transparent
- _rknLA 11y ago
  This sort of thing really depends on the application, and the nice feature provided with the new "force" property is that you can actually distinguish between a "whole finger pad" light touch, and a "thin, firm, almost just the finger nail" hard touch, and most things in betwee.
gdubs 11y ago
That was a private API -- not sure what Apple used it for, since GarageBand was using accelerometer from what I could tell.
- eridius 11y ago
  In iOS 8 it became a public API. But the problem is that this didn't actually directly measure pressure, it just measured touch radius. Pressure affects touch radius, but so do a lot of other things (finger size, what part of the finger is used, which finger is used, etc) and so it's not particularly effective at extracting pressure.

Synaesthesia 11y ago

GarageBand also uses accelerometer data to try get the velocity of taps on drums it works reasonably well, not like 3D Touch of course.

sigmar 11y ago

I would love to see how closely/consistently the output from "contact size" increases with "force"

LoSboccacc 11y ago
I don't think is gonna be consistent among different fingers/people, sadly. but synaptic did pressure sensitivity on contact area long ago, wouldn't be surprised if they got some nice normalization heuristic already going. edit this is funny coincidence: the dev guide for synaptic says 255 level but better badn in 7 levels at most (2005) http://arstechnica.com/civis/viewtopic.php?f=9&t=352584 http://arstechnica.com/civis/viewtopic.php?f=9&t=352584 Edit: I know those are not really comparable teches, force touch for one is transparent
_rknLA 11y ago
This sort of thing really depends on the application, and the nice feature provided with the new "force" property is that you can actually distinguish between a "whole finger pad" light touch, and a "thin, firm, almost just the finger nail" hard touch, and most things in betwee.

gdubs 11y ago

That was a private API -- not sure what Apple used it for, since GarageBand was using accelerometer from what I could tell.

eridius 11y ago
In iOS 8 it became a public API. But the problem is that this didn't actually directly measure pressure, it just measured touch radius. Pressure affects touch radius, but so do a lot of other things (finger size, what part of the finger is used, which finger is used, etc) and so it's not particularly effective at extracting pressure.