From ef4dbc3cba2bbda8c65761f53bfdb24c0a06dcfd Mon Sep 17 00:00:00 2001
From: mob-sakai <12690315+mob-sakai@users.noreply.github.com>
Date: Fri, 3 Jan 2025 22:50:36 +0900
Subject: [PATCH] fix: sub-emitter particles may not render correctly in
 certain scenarios

close #248
---
 Packages/src/Runtime/UIParticleRenderer.cs | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

diff --git a/Packages/src/Runtime/UIParticleRenderer.cs b/Packages/src/Runtime/UIParticleRenderer.cs
index e85d258..a73b4b4 100644
--- a/Packages/src/Runtime/UIParticleRenderer.cs
+++ b/Packages/src/Runtime/UIParticleRenderer.cs
@@ -548,6 +548,24 @@ private Matrix4x4 GetWorldMatrix(Vector3 psPos, Vector3 scale)
                                * Matrix4x4.Scale(scale)
                                * Matrix4x4.Translate(-psPos);
                     }
+
+                    if (_mainEmitter)
+                    {
+                        if (_mainEmitter.IsLocalSpace())
+                        {
+                            return Matrix4x4.Translate(psPos)
+                                   * Matrix4x4.Scale(scale)
+                                   * Matrix4x4.Translate(-psPos);
+                        }
+                        else
+                        {
+                            psPos = _particleSystem.transform.position - _mainEmitter.transform.position;
+                            return Matrix4x4.Translate(psPos)
+                                   * Matrix4x4.Scale(scale)
+                                   * Matrix4x4.Translate(-psPos);
+                        }
+                    }
+
                     return Matrix4x4.Scale(scale);
                 case ParticleSystemSimulationSpace.Custom:
                     return Matrix4x4.Translate(_particleSystem.main.customSimulationSpace.position.GetScaled(scale))