From a481cd2a69acf80f18d479796bbf9c7a024e289e Mon Sep 17 00:00:00 2001
From: Donovan Hutchence <slimbuck7@gmail.com>
Date: Thu, 24 Oct 2024 15:18:43 +0100
Subject: [PATCH] Compressed ply orientation fix (#7064)

---
 src/framework/parsers/gsplat-resource.js   | 4 +---
 src/scene/gsplat/gsplat-compressed-data.js | 8 --------
 2 files changed, 1 insertion(+), 11 deletions(-)

diff --git a/src/framework/parsers/gsplat-resource.js b/src/framework/parsers/gsplat-resource.js
index 7b2eb3802d7..daac2ec47e1 100644
--- a/src/framework/parsers/gsplat-resource.js
+++ b/src/framework/parsers/gsplat-resource.js
@@ -68,9 +68,7 @@ class GSplatResource {
 
         // the ply scene data no longer gets automatically rotated on load, so do
         // it here instead.
-        if (!this.splatData.isCompressed) {
-            entity.setLocalEulerAngles(0, 0, 180);
-        }
+        entity.setLocalEulerAngles(0, 0, 180);
 
         // set custom aabb
         component.customAabb = splatInstance.splat.aabb.clone();
diff --git a/src/scene/gsplat/gsplat-compressed-data.js b/src/scene/gsplat/gsplat-compressed-data.js
index cae45eed5bb..b938b01e27e 100644
--- a/src/scene/gsplat/gsplat-compressed-data.js
+++ b/src/scene/gsplat/gsplat-compressed-data.js
@@ -225,17 +225,9 @@ class GSplatCompressedData {
 
         const iter = this.createIter(p, r, s, c);
 
-        // the compressed data is stored "right way up" so must
-        // be flipped upside down during decompression to match
-        // uncompressed orientation.
-        const q = new Quat().setFromEulerAngles(0, 0, 180);
-
         for (let i = 0; i < this.numSplats; ++i) {
             iter.read(i);
 
-            q.transformVector(p, p);
-            r.mul2(q, r);
-
             data.x[i] = p.x;
             data.y[i] = p.y;
             data.z[i] = p.z;