From 7f7549d2f78d1a9336f2f31d5dcf1fc6e89f7422 Mon Sep 17 00:00:00 2001
From: Wojtek Figat <wojtek@figat.pl>
Date: Tue, 1 Oct 2024 23:07:47 +0200
Subject: [PATCH] Add `Foliage.RemoveAllInstances` to clear all instances of
 foliage

#2957
---
 Source/Engine/Foliage/Foliage.cpp | 6 ++++++
 Source/Engine/Foliage/Foliage.h   | 5 +++++
 2 files changed, 11 insertions(+)

diff --git a/Source/Engine/Foliage/Foliage.cpp b/Source/Engine/Foliage/Foliage.cpp
index 8c0b337ae..427e2260b 100644
--- a/Source/Engine/Foliage/Foliage.cpp
+++ b/Source/Engine/Foliage/Foliage.cpp
@@ -986,6 +986,12 @@ void Foliage::UpdateCullDistance()
 #endif
 }
 
+void Foliage::RemoveAllInstances()
+{
+    Instances.Clear();
+    RebuildClusters();
+}
+
 static float GlobalDensityScale = 1.0f;
 
 float Foliage::GetGlobalDensityScale()
diff --git a/Source/Engine/Foliage/Foliage.h b/Source/Engine/Foliage/Foliage.h
index d10a75a7e..c062279a8 100644
--- a/Source/Engine/Foliage/Foliage.h
+++ b/Source/Engine/Foliage/Foliage.h
@@ -134,6 +134,11 @@ public:
     /// </summary>
     API_FUNCTION() void UpdateCullDistance();
 
+    /// <summary>
+    /// Clears all foliage instances. Preserves the foliage types and other properties.
+    /// </summary>
+    API_FUNCTION() void RemoveAllInstances();
+
 public:
     /// <summary>
     /// Gets the global density scale for all foliage instances. The default value is 1. Use values from range 0-1. Lower values decrease amount of foliage instances in-game. Use it to tweak game performance for slower devices.