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Acceleration decoding doesn't respect AXES_OFFSET #1006

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9il opened this issue Apr 24, 2024 · 5 comments · May be fixed by #1014
Open

Acceleration decoding doesn't respect AXES_OFFSET #1006

9il opened this issue Apr 24, 2024 · 5 comments · May be fixed by #1014
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Area: Hardware Protocol Related to communication with hardware/software trackers Area: Server Related to the server Type: Bug Something isn't working

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@9il
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9il commented Apr 24, 2024 •
edited

SlimeVR do convert rotation from tracker to openGL axis, but forget to do so for acceleration vector.
@Erimelowo
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It does:

SlimeVR-Server/server/core/src/main/java/dev/slimevr/tracking/trackers/udp/TrackersUDPServer.kt

Line 357 in 24f2895

// Switch x and y around to adjust for different axes

@9il
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9il commented Apr 24, 2024 •
edited

AXES_OFFSET transformation is a quaternion transformation; it can't be a reflection transformation. It changes Y and Z with a single sign change.

It does:

It is reflection transformation (conversion between left-hand and right-hand axis).

So, it can't be the same transformation.

@9il
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9il commented Apr 24, 2024

@Louka3000 What is the tracker axis in the UDP packet?

  • Z up or Y up?
  • Is it right-handed or left-handed?

@9il 9il mentioned this issue Apr 24, 2024
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@Erimelowo
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I believe SlimeVR expects Y+ forward, X+ right, Z+ up, but not entirely sure right now
OpenVR is Z- Forward, X+ Right, Y+ Up

@9il
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9il commented Apr 24, 2024

Understood. We're currently dealing with the Z+ up vs. Y+ Up and hand switch issue.

However,

SlimeVR-Server/server/core/src/main/java/dev/slimevr/tracking/trackers/udp/TrackersUDPServer.kt

doesn't affect Z at all.

@9il 9il linked a pull request Apr 29, 2024 that will close this issue
Open
@ImUrX ImUrX added Type: Bug Something isn't working Area: Hardware Protocol Related to communication with hardware/software trackers Area: Server Related to the server labels May 12, 2024
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Area: Hardware Protocol Related to communication with hardware/software trackers Area: Server Related to the server Type: Bug Something isn't working
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Fix acceleration axis and leg tweaks gestures-space/SlimeVR-Server
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@9il @ImUrX @Erimelowo