From 180efe86e6aa28fb16525af70ea7cd29ec2af582 Mon Sep 17 00:00:00 2001
From: Wojtek Figat <wojtek@figat.pl>
Date: Fri, 5 Mar 2021 14:36:59 +0100
Subject: [PATCH] Fix culling for Volumetric Fog particles to include particle
 radius

---
 .../Graph/CPU/ParticleEmitterGraph.CPU.cpp    | 24 +++++++++++++++++++
 1 file changed, 24 insertions(+)

diff --git a/Source/Engine/Particles/Graph/CPU/ParticleEmitterGraph.CPU.cpp b/Source/Engine/Particles/Graph/CPU/ParticleEmitterGraph.CPU.cpp
index a9e90546a..2415350ed 100644
--- a/Source/Engine/Particles/Graph/CPU/ParticleEmitterGraph.CPU.cpp
+++ b/Source/Engine/Particles/Graph/CPU/ParticleEmitterGraph.CPU.cpp
@@ -312,6 +312,30 @@ bool ParticleEmitterGraphCPUExecutor::ComputeBounds(ParticleEmitter* emitter, Pa
                 }
                 break;
             }
+                // Volumetric Fog Rendering
+            case 405:
+            {
+                // Find the maximum radius of the particle
+                float maxRadius = 0.0f;
+                if (_graph._attrRadius != -1)
+                {
+                    byte* radius = bufferPtr + layout->Attributes[_graph._attrRadius].Offset;
+                    for (int32 i = 0; i < count; i++)
+                    {
+                        maxRadius = Math::Max(*((float*)radius), maxRadius);
+                        radius += stride;
+                    }
+                    ASSERT(!isnan(maxRadius) && !isinf(maxRadius));
+                }
+                else
+                {
+                    maxRadius = 100.0f;
+                }
+
+                // Enlarge the emitter bounds sphere
+                sphere.Radius += maxRadius;
+            }
+            break;
             }
         }