From f27fd17b59b2241421d469f7365b7d74a6f0dc7f Mon Sep 17 00:00:00 2001
From: wheaney <42350981+wheaney@users.noreply.github.com>
Date: Wed, 10 Sep 2025 21:38:56 -0700
Subject: [PATCH] Apply lens distance ratio

---
 kwin/src/qml/CameraController.qml | 18 ++++++++++--------
 kwin/src/qml/main.qml             |  1 +
 2 files changed, 11 insertions(+), 8 deletions(-)

diff --git a/kwin/src/qml/CameraController.qml b/kwin/src/qml/CameraController.qml
index ce69a9c..0b7eba6 100644
--- a/kwin/src/qml/CameraController.qml
+++ b/kwin/src/qml/CameraController.qml
@@ -5,6 +5,7 @@ Item {
     id: root
 
     required property Camera camera
+    required property var fovDetails
 
     property var displayResolution: effect.displayResolution
     property real diagonalFOV: effect.diagonalFOV
@@ -19,8 +20,14 @@ Item {
         id: displays
     }
 
-    function updateCamera(rotation) {
-        camera.eulerRotation = rotation;
+    function updateCamera() {
+        camera.eulerRotation = applyLookAhead(
+            effect.imuRotations[0],
+            effect.imuRotations[1],
+            effect.imuTimeElapsedMs,
+            lookAheadMS(effect.imuTimestamp, effect.lookAheadConfig, -1)
+        );
+        camera.position = effect.imuRotations[0].times(Qt.vector3d(0, 0, -fovDetails.lensDistancePixels));
     }
 
     // how far to look ahead is how old the IMU data is plus a constant that is either the default for this device or an override
@@ -68,12 +75,7 @@ Item {
         running: true
         onTriggered: {
             if (effect.imuRotations && effect.imuRotations.length > 0) {
-                updateCamera(applyLookAhead(
-                    effect.imuRotations[0],
-                    effect.imuRotations[1],
-                    effect.imuTimeElapsedMs,
-                    lookAheadMS(effect.imuTimestamp, effect.lookAheadConfig, -1)
-                ));
+                updateCamera();
             }
         }
     }
diff --git a/kwin/src/qml/main.qml b/kwin/src/qml/main.qml
index d99b850..5be9f5c 100644
--- a/kwin/src/qml/main.qml
+++ b/kwin/src/qml/main.qml
@@ -122,6 +122,7 @@ Item {
                 id: cameraController
                 anchors.fill: parent
                 camera: camera
+                fovDetails: fovDetails
             }
         }
     }