From ed466f6376f2a6bd105c1cf970a554ac7b2e671c Mon Sep 17 00:00:00 2001
From: "adnan.mujkic" <adnan.mujkic97@gmail.com>
Date: Tue, 15 Sep 2026 11:11:50 +0200
Subject: [PATCH] Settings tweaks for better performance

---
 Config/DefaultEngine.ini                       |  3 +++
 .../Vegetation/MF_WindDirectionAdd.uasset      |  4 ++--
 Content/Scripts/BP_TimeOfDay.uasset            |  4 ++--
 Content/UI/OptionsScreen.uasset                |  4 ++--
 Content/Vegetation/SMF_FlowerRed.uasset        |  4 ++--
 Content/Vegetation/SMF_FlowerYellow.uasset     |  4 ++--
 Content/Vegetation/SMF_GrassFoliageNew.uasset  |  4 ++--
 .../0/8V/LUAATS6M4NHS97CBUGIMYT.uasset         |  4 ++--
 .../1/KL/OP8Z4H2UJWUNRRUZWFTT6N.uasset         |  4 ++--
 .../3/HC/8B3IUVFL21S5A7AZXYPDKE.uasset         |  4 ++--
 .../3/MR/D5JBII8PWTB9TKU2OB88OO.uasset         |  4 ++--
 .../4/31/3ILPS4P6XVKN4AY6AR9YPY.uasset         |  4 ++--
 .../5/H3/F81FXBOS8PI369DHMH33TK.uasset         |  4 ++--
 .../5/ME/36O183J1A9EWZ5VLXJ4FI1.uasset         |  4 ++--
 .../5/ZZ/QOV2E2OX1QIM6GCD0HLYCH.uasset         |  4 ++--
 .../8/NW/6PP9E6KBPGMD5Y2ZRSWFDL.uasset         |  4 ++--
 .../8/U3/IF8UBXCHS290DD2XA11JD5.uasset         |  4 ++--
 .../A/FP/FKRFVGEJM14C0FQ2PL4URD.uasset         |  4 ++--
 .../B/JX/B8GD26U4E09IJ6LKJCYJED.uasset         |  4 ++--
 .../B/S2/W9Y1MY04170LA9NU56DIK9.uasset         |  4 ++--
 .../D/JS/5YSW3URDY5J8WPQ33I5ZH2.uasset         |  4 ++--
 .../D/MJ/Q798ERNCOWH3QGCHW6VIM1.uasset         |  4 ++--
 .../D/W4/NIPFEFVGYJSC7WB142VIEH.uasset         |  4 ++--
 .../ProjectEleri/Private/TimeOfDayManager.cpp  | 18 +++++++++++++++++-
 Source/ProjectEleri/Public/TimeOfDayManager.h  | 17 +++++++++++++++++
 25 files changed, 81 insertions(+), 45 deletions(-)

diff --git a/Config/DefaultEngine.ini b/Config/DefaultEngine.ini
index f70ea517..9a7d2a9d 100644
--- a/Config/DefaultEngine.ini
+++ b/Config/DefaultEngine.ini
@@ -165,6 +165,7 @@ r.Lumen.Reflections.HardwareRayTracing.Translucent.Refraction.EnableForProject=F
 r.Streaming.PoolSize=2048
 
 r.Shadow.CSMCaching=True
+r.Shadow.RadiusThreshold=0.04
 r.Nanite.ProjectEnabled=False
 r.Nanite=False
 
@@ -194,6 +195,8 @@ r.VolumetricCloud.ViewRaySampleMaxCount=64
 
 r.DistanceFieldAO=0
 r.DistanceFieldShadowing=0
+r.AmbientOcclusionLevels=1
+r.Shadow.CSMCaching=0
 
 [/Script/LinuxTargetPlatform.LinuxTargetSettings]
 TargetArchitecture=X86_64UnknownLinuxGnu
diff --git a/Content/Materials/Vegetation/MF_WindDirectionAdd.uasset b/Content/Materials/Vegetation/MF_WindDirectionAdd.uasset
index d996cc65..2a3cbaa4 100644
--- a/Content/Materials/Vegetation/MF_WindDirectionAdd.uasset
+++ b/Content/Materials/Vegetation/MF_WindDirectionAdd.uasset
@@ -1,3 +1,3 @@
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diff --git a/Content/Scripts/BP_TimeOfDay.uasset b/Content/Scripts/BP_TimeOfDay.uasset
index f9d0a7fd..e02159d1 100644
--- a/Content/Scripts/BP_TimeOfDay.uasset
+++ b/Content/Scripts/BP_TimeOfDay.uasset
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+size 462890
diff --git a/Content/UI/OptionsScreen.uasset b/Content/UI/OptionsScreen.uasset
index 9b1a7d0a..dbaffd8a 100644
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index 7926be88..f6486f89 100644
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index 4063d97d..188972c8 100644
--- a/Content/Vegetation/SMF_FlowerYellow.uasset
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--- a/Content/Vegetation/SMF_GrassFoliageNew.uasset
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diff --git a/Source/ProjectEleri/Private/TimeOfDayManager.cpp b/Source/ProjectEleri/Private/TimeOfDayManager.cpp
index 5d0c6eb1..b0b24e98 100644
--- a/Source/ProjectEleri/Private/TimeOfDayManager.cpp
+++ b/Source/ProjectEleri/Private/TimeOfDayManager.cpp
@@ -297,12 +297,28 @@ void ATimeOfDayManager::RotateSun(const float &_rotator)
 {
     if (!enableTimeOfDay)
         return;
+    if (!CurrentWeatherPreset || !CurrentWeatherPreset->SunRotationCurve)
+        return;
     if (sunLight->IsValidLowLevel())
     {
         FVector currentRotInVectors = FVector(0.0f, CurrentWeatherPreset->SunRotationCurve->GetFloatValue(FloatMinutes),
                                               110.0f);
         FRotator currentSunRotation = FRotator(FRotator::MakeFromEuler(currentRotInVectors));
-        sunLight->SetWorldRotation(currentSunRotation);
+
+        // The renderer only reuses its cached CSM shadow maps while the light matrix is bit-identical (the
+        // cached shadow initializer is compared with == in the shadow setup), so re-orienting the light every
+        // frame throws the whole cascade shadow map cache away every frame. Only move the light once the sun
+        // actually travelled far enough to be worth the cache rebuild.
+        const float PitchDelta = FMath::Abs(FMath::FindDeltaAngleDegrees(AppliedSunRotation.Pitch, currentSunRotation.Pitch));
+        const float YawDelta = FMath::Abs(FMath::FindDeltaAngleDegrees(AppliedSunRotation.Yaw, currentSunRotation.Yaw));
+
+        if (bSunRotationDirty || SunRotationUpdateThreshold <= 0.0f || PitchDelta >= SunRotationUpdateThreshold ||
+            YawDelta >= SunRotationUpdateThreshold)
+        {
+            sunLight->SetWorldRotation(currentSunRotation);
+            AppliedSunRotation = currentSunRotation;
+            bSunRotationDirty = false;
+        }
     }
 }
 
diff --git a/Source/ProjectEleri/Public/TimeOfDayManager.h b/Source/ProjectEleri/Public/TimeOfDayManager.h
index ae7fe192..4f27b963 100644
--- a/Source/ProjectEleri/Public/TimeOfDayManager.h
+++ b/Source/ProjectEleri/Public/TimeOfDayManager.h
@@ -205,12 +205,29 @@ public:
     UPROPERTY(EditAnywhere, Category = "Time of Day - Lightning Setting")
     float daySpeed = 10.0f;
 
+    /** Minimum movement of the sun in degrees before the directional light is actually re-oriented.
+     *  The renderer only reuses its cached CSM shadow maps while the light matrix is completely unchanged
+     *  (the cached shadow initializer is compared with == in the shadow setup), so writing the light
+     *  transform every frame invalidates and releases the whole cascade shadow map cache every frame.
+     *  The light is re-oriented roughly every (SunRotationUpdateThreshold / sun degrees per second) seconds,
+     *  so the cache is reused for all the frames in between. 0 disables the throttle. */
+    UPROPERTY(EditAnywhere, BlueprintReadWrite, Category = "Time of Day - Lightning Setting")
+    float SunRotationUpdateThreshold = 0.1f;
+
     UPROPERTY(EditAnywhere, Category = "Time of Day - Lightning Setting")
     FLinearColor SubsurfaceColorDay;
 
     UPROPERTY(VisibleAnywhere, Category = "Time of Day - Info")
     float rotator;
 
+    /** Rotation that is currently applied to sunLight, used to throttle the per-frame SetWorldRotation. */
+    UPROPERTY(VisibleAnywhere, Category = "Time of Day - Info")
+    FRotator AppliedSunRotation;
+
+    /** True until the current sun rotation has been pushed into the light at least once. */
+    UPROPERTY(VisibleAnywhere, Category = "Time of Day - Info")
+    bool bSunRotationDirty = true;
+
     UPROPERTY(VisibleAnywhere, Category = "Time of Day - Info")
     float CurrentWeaterFadeAlpha;