From b71940f4922e80d16f6afd0bfcdcff021ce0d67e Mon Sep 17 00:00:00 2001
From: Claude <noreply@anthropic.com>
Date: Mon, 13 Apr 2026 15:23:53 +0000
Subject: [PATCH] Fix lookAt camera y=false using orbit-center Y instead of
 camera world Y

For ArcRotateCamera, getAbsolutePosition() returns the camera's world
position (orbit centre + orbital offset), not the orbit centre itself.
Using that Y value as the new setTarget() height displaced the orbit
centre upward by the full orbital offset, making the camera tilt down
instead of staying level.

Fix: use mesh1.target?.y (the actual orbit-centre Y for ArcRotateCamera,
and the current look-at Y for FreeCamera) so that only the X/Z of the
orbit centre changes, giving a pure horizontal yaw with no pitch change.

https://claude.ai/code/session_012ASzHmpUWv39A2j5hiFzyc
---
 api/transform.js | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/api/transform.js b/api/transform.js
index 11c52b39b..dd5a1bc76 100644
--- a/api/transform.js
+++ b/api/transform.js
@@ -545,7 +545,7 @@ export const flockTransform = {
       const tgtPos = (
         mesh2.getAbsolutePosition?.() ?? mesh2.absolutePosition
       ).clone();
-      if (!useY) tgtPos.y = camPos.y;
+      if (!useY) tgtPos.y = mesh1.target?.y ?? camPos.y;
       mesh1.setTarget(tgtPos);
       await new Promise((resolve) => {
         const cb = () => {