From 20f1e67700dd884be28ecdd25ff4f750ebd81663 Mon Sep 17 00:00:00 2001
From: Wojtek Figat <wojtek@figat.pl>
Date: Mon, 14 Jul 2025 21:09:28 +0200
Subject: [PATCH] Optimize Spline debug rendering far from camera

---
 Source/Engine/Level/Actors/Spline.cpp | 36 ++++++++++++++++++++-------
 1 file changed, 27 insertions(+), 9 deletions(-)

diff --git a/Source/Engine/Level/Actors/Spline.cpp b/Source/Engine/Level/Actors/Spline.cpp
index 7be63fd99..25bdc4ce9 100644
--- a/Source/Engine/Level/Actors/Spline.cpp
+++ b/Source/Engine/Level/Actors/Spline.cpp
@@ -6,6 +6,7 @@
 #include "Engine/Core/Math/BoundingFrustum.h"
 #include "Engine/Core/Math/Matrix.h"
 #include "Engine/Scripting/ManagedCLR/MCore.h"
+#include "Engine/Engine/Units.h"
 
 Spline::Spline(const SpawnParams& params)
     : Actor(params)
@@ -506,16 +507,33 @@ namespace
             return;
         Spline::Keyframe* prev = spline->Curve.GetKeyframes().Get();
         Vector3 prevPos = transform.LocalToWorld(prev->Value.Translation);
-        DEBUG_DRAW_WIRE_SPHERE(BoundingSphere(prevPos, NodeSizeByDistance(prevPos, scaleByDistance)), color, 0.0f, depthTest);
-        for (int32 i = 1; i < count; i++)
+        float distance = Vector3::Distance(prevPos, DebugDraw::GetViewPos());
+        if (distance < METERS_TO_UNITS(800)) // 800m
         {
-            Spline::Keyframe* next = prev + 1;
-            Vector3 nextPos = transform.LocalToWorld(next->Value.Translation);
-            DEBUG_DRAW_WIRE_SPHERE(BoundingSphere(nextPos, NodeSizeByDistance(nextPos, scaleByDistance)), color, 0.0f, depthTest);
-            const float d = (next->Time - prev->Time) / 3.0f;
-            DEBUG_DRAW_BEZIER(prevPos, prevPos + prev->TangentOut.Translation * d, nextPos + next->TangentIn.Translation * d, nextPos, color, 0.0f, depthTest);
-            prev = next;
-            prevPos = nextPos;
+            // Bezier curve
+            DEBUG_DRAW_WIRE_SPHERE(BoundingSphere(prevPos, NodeSizeByDistance(prevPos, scaleByDistance)), color, 0.0f, depthTest);
+            for (int32 i = 1; i < count; i++)
+            {
+                Spline::Keyframe* next = prev + 1;
+                Vector3 nextPos = transform.LocalToWorld(next->Value.Translation);
+                DEBUG_DRAW_WIRE_SPHERE(BoundingSphere(nextPos, NodeSizeByDistance(nextPos, scaleByDistance)), color, 0.0f, depthTest);
+                const float d = (next->Time - prev->Time) / 3.0f;
+                DEBUG_DRAW_BEZIER(prevPos, prevPos + prev->TangentOut.Translation * d, nextPos + next->TangentIn.Translation * d, nextPos, color, 0.0f, depthTest);
+                prev = next;
+                prevPos = nextPos;
+            }
+        }
+        else
+        {
+            // Simplified
+            for (int32 i = 1; i < count; i++)
+            {
+                Spline::Keyframe* next = prev + 1;
+                Vector3 nextPos = transform.LocalToWorld(next->Value.Translation);
+                DEBUG_DRAW_LINE(prevPos, nextPos, color, 0.0f, depthTest);
+                prev = next;
+                prevPos = nextPos;
+            }
         }
     }
 }