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d/wmr: Correct SLAM-tracked IMU pose to middle of the eyes

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Mateo de Mayo 2022-06-13 17:57:04 -03:00
parent 008ba2433b
commit f390214f66
2 changed files with 16 additions and 0 deletions
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12
src/xrt/drivers/wmr/wmr_hmd.c
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@ -1003,6 +1003,10 @@ wmr_hmd_get_slam_tracked_pose(struct xrt_device *xdev,
#endif
}
if (wh->tracking.imu2me) {
math_pose_transform(&wh->pose, &wh->P_imu_me, &wh->pose);
}
out_relation->pose = wh->pose;
out_relation->relation_flags = (enum xrt_space_relation_flags)(
XRT_SPACE_RELATION_ORIENTATION_VALID_BIT | XRT_SPACE_RELATION_POSITION_VALID_BIT |
@ -1463,6 +1467,7 @@ wmr_hmd_setup_ui(struct wmr_hmd *wh)
u_var_add_gui_header(wh, NULL, "SLAM Tracking");
u_var_add_ro_text(wh, wh->gui.slam_status, "Tracker status");
u_var_add_bool(wh, &wh->tracking.imu2me, "Correct IMU pose to middle of eyes");
u_var_add_gui_header(wh, NULL, "Hand Tracking");
u_var_add_ro_text(wh, wh->gui.hand_status, "Tracker status");
@ -1524,6 +1529,7 @@ wmr_hmd_setup_trackers(struct wmr_hmd *wh, struct xrt_slam_sinks *out_sinks, str
wh->tracking.slam_enabled = slam_enabled;
wh->tracking.hand_enabled = hand_enabled;
wh->tracking.imu2me = true;
wh->slam_over_3dof = slam_enabled; // We prefer SLAM over 3dof tracking if possible
@ -1632,6 +1638,7 @@ precompute_sensor_transforms(struct wmr_hmd *wh)
struct xrt_pose P_me_gyr = {0};
struct xrt_pose P_ht0_me = {0};
struct xrt_pose P_acc_me = {0};
struct xrt_pose P_oxr_acc_me = {0}; // P_acc_me in OpenXR coordinates
// All of the observed headsets have reported a zero translation for its gyro
assert(m_vec3_equal_exact(P_gyr_ht0.position, (struct xrt_vec3){0, 0, 0}));
@ -1648,9 +1655,14 @@ precompute_sensor_transforms(struct wmr_hmd *wh)
math_pose_invert(&P_me_ht0, &P_ht0_me);
math_pose_invert(&P_me_acc, &P_acc_me);
// Express P_*_me pose in OpenXR coordinates through sandwich products.
math_pose_transform(&P_acc_me, &P_wmr_oxr, &P_oxr_acc_me);
math_pose_transform(&P_oxr_wmr, &P_oxr_acc_me, &P_oxr_acc_me);
// Save transforms
math_pose_transform(&P_oxr_wmr, &P_me_acc, &wh->P_oxr_acc);
math_pose_transform(&P_oxr_wmr, &P_me_gyr, &wh->P_oxr_gyr);
wh->P_imu_me = P_oxr_acc_me; // Assume accel pose is IMU pose
}
void

4
src/xrt/drivers/wmr/wmr_hmd.h
View file

@ -119,6 +119,7 @@ struct wmr_hmd
//! Precomputed transforms, @see precompute_sensor_transforms.
struct xrt_pose P_oxr_acc; //!< Converts accel samples into OpenXR coordinates
struct xrt_pose P_oxr_gyr; //!< Converts gyro samples into OpenXR coordinates
struct xrt_pose P_imu_me; //!< IMU=accel. IMU-to-ME transform but in OpenXR coordinates
struct hololens_sensors_packet packet;
@ -157,6 +158,9 @@ struct wmr_hmd
//! Set at start. Whether the hand tracker was initialized.
bool hand_enabled;
//! SLAM systems track the IMU pose, enabling this corrects it to middle of the eyes
bool imu2me;
} tracking;
//! Whether to track the HMD with 6dof SLAM or fallback to the `fusion` 3dof tracker