HTC VIVE Tracker 3.0 Manuale di istruzioni

Version no.

Release date

Content

1.0

2021.01.18

Initial public version for VIVE Tracker (3.0)

other HTC product and services names are the trademarks or registered trademarks of HTC

Corporation and its affiliates in the U.S. and other countries.

 
 
 
 
Introduction.................................................................................................................................1 
Use cases ............................................................................................................................................ 1 
Hardware requirements ..............................................................................................................3
Interface............................................................................................................................................... 3 
Radio frequency (RF)........................................................................................................................... 4 
Power................................................................................................................................................... 5 
Optics................................................................................................................................................... 5 
Docking................................................................................................................................................ 6 
Mechanical considerations ........................................................................................................9
Apparel size ......................................................................................................................................... 9 
Main feature....................................................................................................................................... 10 
Docking mechanism.......................................................................................................................... 11 
Damping mechanism ........................................................................................................................ 12 
Accessory design .............................................................................................................................. 13 
Coordinate system ............................................................................................................................ 18 
Software components ............................................................................................................. 20 
System requirements ........................................................................................................................ 20 
Data formats...................................................................................................................................... 21 
Accessory integration ....................................................................................................................... 24 
Unity integration................................................................................................................................ 28 
VIVE Trackers and VIVE Roles........................................................................................................... 40 
Tracker on Unity or Unreal ................................................................................................................ 42 
Firmware upgrade ............................................................................................................................. 42 
 
 
 

VIVE Tracker (3.0)

HTC Corporation

Developer Guidelines

V1.0

12/16/2020

1 HTC Confidential and Proprietary

This document describes the development guidelines for VR accessory makers and content

developers. It contains information on how to use the VIVE Tracker (3.0) to enable positional

tracking and transmission of specific data (with or without the HTC VIVE VR system).

VIVE Tracker (3.0) can pair with HTC’s wireless dongle or use its USB interface to transfer

tracking data to a PC. An accessory attached to VIVE Tracker (3.0) can:

Simulate buttons of the VIVE Controller through the underlying Pogo pin port.

Send specific data to a PC through the USB interface of VIVE Tracker (3.0).

There are five use cases supported by VIVE Tracker (3.0).

Use Case 1: Track passive objects through USB interface in VR. In this case, the dongle is not

used. VIVE Tracker (3.0) is connected to the PC through USB to directly transfer tracking data.

Use Case 2: Track passive objects through USB interface in VR, with the accessory passing

data to a PC through USB, BT/Wi-Fi or propriety RF. This is similar to Use Case 1 but the

accessory directly transfers the tracking data to a PC for a specific purpose based on its

design.

VIVE Tracker (3.0)

HTC Corporation

Developer Guidelines

V1.0

12/16/2020

2 HTC Confidential and Proprietary

Use Case 3: Track moving objects by wireless interface in VR. In this case, the dongle is used

to transfer tracking data from the VIVE Tracker (3.0) to a PC.

Use Case 4: Track moving objects using a wireless interface in VR, with the accessory

passing data to a PC through USB, BT/Wi-Fi or propriety RF. This is similar to Use Case 3 but

the accessory directly transfer the tracking data to/from a PC for a specific purpose based on

its design.

Use Case 5: Track moving objects using a wireless interface in VR, with the accessory

simulating buttons of the VIVE Controller or passing data to a PC through the VIVE Tracker

(3.0). This is similar to Use Case 3 but the accessory connects with the VIVE Tracker (3.0) to

transfer a button event to a PC through the Pogo pins or USB interface.

VIVE Tracker (3.0)

HTC Corporation

Developer Guidelines

V1.0

12/16/2020

3 HTC Confidential and Proprietary

This section describes hardware requirements for accessories used with the VIVE Tracker

(3.0) in order to enable positional tracking and input of specific data for the HTC VIVE VR

system.

A compatible accessory can be attached to the VIVE Tracker (3.0) to send specific data to a

PC through the USB interface of the VIVE Tracker (3.0). The VIVE Tracker (3.0) needs to be

paired with the dongle first to be able to transfer an event to a PC. The figure below describes

the conceptual architecture.

USB 2.0 full speed (client) from USB Type-C connector.

GPIO Pin Absolute Maximum Rating

Symbol

Parameter

Min

Max

Unit

Input voltage

- 0.3

3.6

VESD

Electrostatic discharge voltage , Human Body Model

4000

Accessor

VIVE

Tracker

Dongle PC

USB

Wireless

VIVE Tracker (3.0)

HTC Corporation

Developer Guidelines

V1.0

12/16/2020

4 HTC Confidential and Proprietary

GPIO Pin Electrical Characteristics (Supply voltage VDD = 3.3 V)

Symbol

Parameter

Min

Typ

Max

Unit

VOH

High-level output voltage

VDD - 0.4

VOL

Low-level output voltage

0.4

VIH

High-level input voltage

0.7VDD

VIL

Low-level input voltage

0.3VDD

IOH

High-level output current

IOL

Low-level output current

IIH

High-level input current

-1

0.5

IIL

Low-level input current

-1

0.5

To establish a stable wireless connection between the VIVE Tracker (3.0) and the dongle, the

OTA performance of VIVE Tracker (3.0) cannot degrade to more than 3dB when an accessory

is attached to the VIVE Tracker (3.0).

The following are recommendations for better RF performance.

Figure: Illustrates the “keep out” area where only nonmetallic parts of the accessory should be inside (spherical

radius = 30 mm with the center being the antenna feed point)

VIVE Tracker (3.0)

HTC Corporation

Developer Guidelines

V1.0

12/16/2020

5 HTC Confidential and Proprietary

Except for essential parts, such as the 1/4’’ screw, electric connection pad (which connects

with the Pogo pin), and related circuits of the electric connection pad, metal parts of the

accessory should be separated from the antenna by at least 30mm to prevent OTA

performance reduction when the accessory is attached to VIVE Tracker (3.0).

USB-C Connector

Voltage requirement

Max. Charging current

Charging time (approx.)

5V+/-5%

700 mA

2 hrs

500 mA

3 hrs

Pogo Pin 3

Voltage requirement

Max. Charging current

Charging time (approx.)

5V+/-5%

500 mA

3 hrs

Note

AC: D+ short to D-

PC: D+/D- communication

The field of view (FOV) of VIVE Tracker (3.0) is 240 degrees. Avoid obstructing the FOV of

VIVE Tracker (3.0) as this will block responses from the tracker sensors.

If the parts of the docking extend beyond the recommended placement cone, additional views

will be blocked.

Figure: Part of dock extend beyond recommended placement cone

VIVE Tracker (3.0)

HTC Corporation

Developer Guidelines

V1.0

12/16/2020

6 HTC Confidential and Proprietary

Requirements for docking compatibility:

a. The docking design of VIVE Tracker (3.0) follows the ISO standard (ISO 1222:2010).

Furthermore, VIVE Tracker (3.0) has some constraints such as the longer screws

cannot be screwed all the way in.

b. The user should be able to easily attach and detach VIVE Tracker (3.0) with two

hands. One hand holds VIVE Tracker (3.0), and the other hand holds the accessory.

c. The user should not be at risk of physical harm while attaching or detaching VIVE

Tracker (3.0).

d. The user should be comfortable while attaching and detaching VIVE Tracker (3.0).

e. The accessory attached with VIVE Tracker (3.0) should be in the shape of a physical

object to avoid hitting it while in use.

f. VIVE Tracker (3.0) should not be blocked by the accessory and affect the tracking

performance.

g. It is strongly recommended that the accessory uses low reflection materials for its

outer skin to avoid reflective interference with the tracking sensors, especially if the

accessory needs to be placed inside the FOV of VIVE Tracker (3.0).

Gun

VIVE Tracker (3.0)

HTC Corporation

Developer Guidelines

V1.0

12/16/2020

7 HTC Confidential and Proprietary

Sword

It is recommended to place the mounting mechanism close to where the sword is held. Also,

it is recommended to set the sword length in the VR applications.

Multi-purpose docking base

Users can attach VIVE Tracker (3.0) to any object/surface that is intended to be tracked.

If the object/surface is smooth and stiff, it is recommended to use a strong adhesive

tape for attaching the docking base to the object/surface (ex. 3M VHB tape).

If the object/surface is rough and soft, it is recommended to use a strap for tightening

the docking base to the object/surface.

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