HTC Vive gaze module

The HTC Vive gaze module reads eye-tracking data from an HTC Vive headset’s built-in eye tracker through HTC’s Vive Streaming SDK (VS_PC_SDK.dll), and publishes gaze rays, blink state and pupillometry into HEAT Capture.

What you need

Windows 10/11 x64.
SteamVR running, with the headset connected and streaming.
HTC’s Vive Business Streaming (VBS) driver installed. The module connects to it, not to the headset directly; if VBS is not installed or SteamVR is not running, the module never receives eye data. See Troubleshooting.

Process capability

This module declares the process.unrestricted capability, an explicit opt-out from HEAT Capture’s default per-module process restriction. The Vive Streaming SDK’s background service does not tolerate the restricted token HEAT Capture normally launches modules with; without the opt-out it would fail to start. The module still runs out-of-process, signed and job-contained like every other module - see Install a capture module for what that means and how capability declarations are verified before a module starts.

Settings

There is one setting of its own, SendAtNativeRate (boolean, default true), under HEAT.HTCGazeModule:

true (default): each eye-data update from the Vive Streaming SDK is published immediately, at whatever rate the headset’s eye tracker delivers it.
false: HEAT Capture’s own per-tick poll publishes the most recently received eye-data update instead, replaying it across ticks if nothing new arrived.

Beyond that, it exposes only the generic settings every module has (Enabled, Interval, OverrideNodeId/NodeId, Timeout) - see Manage capture modules.

Interface Control Document

See Interface control document for Vive Streaming SDK entry points, status transitions, callback payload layout, sample validity, frame publication and restart limits.