Fix broken behavior on active VR Landmark change

There would always be an unintended offset applied. Per design there
should not be any offset when changing VR Landmarks, the view should
just jump exactly to the Landmark.

Due to the recent changes, we don't have to add, but substract the eye
offset we apply to get the wanted behavior.

Mistake in 607d745a79e0.

2 files changed, 4 insertions, 4 deletions

diff --git a/source/blender/windowmanager/xr/intern/wm_xr_draw.c b/source/blender/windowmanager/xr/intern/wm_xr_draw.c
index 684e59eb8b2..6f96d2ea6a0 100644
--- a/source/blender/windowmanager/xr/intern/wm_xr_draw.c
+++ b/source/blender/windowmanager/xr/intern/wm_xr_draw.c
@@ -55,7 +55,7 @@ static void wm_xr_draw_matrices_create(const wmXrDrawData *draw_data,
 
   copy_qt_qt(eye_pose.orientation_quat, draw_view->eye_pose.orientation_quat);
   copy_v3_v3(eye_pose.position, draw_view->eye_pose.position);
-  add_v3_v3(eye_pose.position, draw_data->eye_position_ofs);
+  sub_v3_v3(eye_pose.position, draw_data->eye_position_ofs);
   if ((session_settings->flag & XR_SESSION_USE_POSITION_TRACKING) == 0) {
     sub_v3_v3(eye_pose.position, draw_view->local_pose.position);
   }
diff --git a/source/blender/windowmanager/xr/intern/wm_xr_session.c b/source/blender/windowmanager/xr/intern/wm_xr_session.c
index b44f006cde8..ded8ebada79 100644
--- a/source/blender/windowmanager/xr/intern/wm_xr_session.c
+++ b/source/blender/windowmanager/xr/intern/wm_xr_session.c
@@ -255,9 +255,9 @@ void wm_xr_session_state_update(const XrSessionSettings *settings,
   copy_v3_v3(viewer_pose.position, draw_data->base_pose.position);
   /* The local pose and the eye pose (which is copied from an earlier local pose) both are view
    * space, so Y-up. In this case we need them in regular Z-up. */
-  viewer_pose.position[0] += draw_data->eye_position_ofs[0];
-  viewer_pose.position[1] -= draw_data->eye_position_ofs[2];
-  viewer_pose.position[2] += draw_data->eye_position_ofs[1];
+  viewer_pose.position[0] -= draw_data->eye_position_ofs[0];
+  viewer_pose.position[1] += draw_data->eye_position_ofs[2];
+  viewer_pose.position[2] -= draw_data->eye_position_ofs[1];
   if (use_position_tracking) {
     viewer_pose.position[0] += draw_view->local_pose.position[0];
     viewer_pose.position[1] -= draw_view->local_pose.position[2];