From 12cdf765f8a22330b3d92fdb3c38edbbb5aaecc1 Mon Sep 17 00:00:00 2001
From: ragnarok-clanker <ragnarok-clanker>
Date: Thu, 5 Nov 2026 15:33:39 +0000
Subject: [PATCH] Decompile fn_19985 (CEffectPrim::RenderCurvedFanTrail)

Batch #12459 by Yommy: 0 byte-identical, 1 confirmed by peer review.

- fn_19985 CEffectPrim::RenderCurvedFanTrail: logic confirmed by peer review

Peer-reviewed-by: Tanke, dori, cremane
Accepted without human review: peers confirmed the logic ("same" ahead by at least 3, with 70% of the votes).
---
 .../Contents/Effects/EffectPrimitiveArcs.cpp  | 24 ++++++++++++++-----
 1 file changed, 18 insertions(+), 6 deletions(-)

diff --git a/Source/Contents/Effects/EffectPrimitiveArcs.cpp b/Source/Contents/Effects/EffectPrimitiveArcs.cpp
index ebd5b8f5..0aa6f33a 100644
--- a/Source/Contents/Effects/EffectPrimitiveArcs.cpp
+++ b/Source/Contents/Effects/EffectPrimitiveArcs.cpp
@@ -794,10 +794,16 @@ void CEffectPrim::RenderCurvedFanTrail(matrix& wtm) {
         angle -= 360;
       }
 
-      const int low = angle - 15;
+      int leftAngle = angle - 15;
+      if (leftAngle < 0) {
+        leftAngle += 360;
+      }
+      int rightAngle = angle + 15;
+      if (rightAngle >= 360) {
+        rightAngle -= 360;
+      }
       const int high = angle + 15;
-      const int leftAngle = low < 0 ? low + 360 : low;
-      const int rightAngle = high < 360 ? high : high - 360;
+      const int low = angle - 15;
       const int backRightAngle = high - 180 < 0 ? high - 180 + 360 : high - 180;
       const int backLeftAngle = low + 180 < 360 ? low + 180 : low + 180 - 360;
       const float rotCos = g_cosTable[slot.rotStart];
@@ -940,10 +946,16 @@ void CEffectPrim::RenderCurvedFanTrail(matrix& wtm) {
         angle -= 360;
       }
 
-      const int low = angle - 25;
+      int leftAngle = angle - 25;
+      if (leftAngle < 0) {
+        leftAngle += 360;
+      }
+      int rightAngle = angle + 25;
+      if (rightAngle >= 360) {
+        rightAngle -= 360;
+      }
       const int high = angle + 25;
-      const int leftAngle = low < 0 ? low + 360 : low;
-      const int rightAngle = high < 360 ? high : high - 360;
+      const int low = angle - 25;
       const int backRightAngle = high - 180 < 0 ? high - 180 + 360 : high - 180;
       const int backLeftAngle = low + 180 < 360 ? low + 180 : low + 180 - 360;
       const float rotCos = g_cosTable[slot.rotStart];