From 41c4b9e506a8f1dbd20ef7cb2052f94fb2494604 Mon Sep 17 00:00:00 2001
From: swrring <swrring@naver.com>
Date: Thu, 7 May 2026 18:28:29 +0900
Subject: [PATCH] =?UTF-8?q?BT5-Dev=20#43:=20IsGrounded=20=EC=98=81?=
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PD 보고: 시작 시 떨어짐

자인:
- BT42 IsGrounded 조건 영역 → 게임 시작 frame 0 IsGrounded=false (KinematicObject 영역 영역 영역 PerformMovement 결과) → standingOnPlatform=false → mask OFF → 발판 영역 영역 → 떨어짐

정정:
- IsGrounded 조건 폐기
- footHit 단독 판정 (Player 발 ↓ 0.1m raycast Layer 16 hit → 발판 위 영역)
- 점프 영역 (jumpState=Jumping || InFlight+velocity.y>0) → standingOnPlatform=false 강제 (점프 시작 시 발판 영역 차단)

동작:
- 게임 시작 → footHit 영역 (Player 발판 위 영역) → standingOnPlatform=true → mask ON → 정착
- 걷기 옆 (footHit X) → standingOnPlatform=false → mask OFF → 통과
- 점프 (Jumping/InFlight+상승) → standingOnPlatform=false 강제 → mask OFF → 통과
- 하강 후 발판 위 (footHit) → standingOnPlatform=true → 착지
---
 Assets/Scripts/Mechanics/PlayerController.cs | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/Assets/Scripts/Mechanics/PlayerController.cs b/Assets/Scripts/Mechanics/PlayerController.cs
index 93041fa..cbfccdc 100644
--- a/Assets/Scripts/Mechanics/PlayerController.cs
+++ b/Assets/Scripts/Mechanics/PlayerController.cs
@@ -204,9 +204,12 @@ namespace Platformer.Mechanics
         {
             int baseMask = Physics2D.GetLayerCollisionMask(gameObject.layer);
 
-            // BT5-Dev #42 — PD 의도: 발판 위 착지(서있는) 영역만 충돌 ON, 걷기·점프·측면 영역 모두 통과
+            // BT5-Dev #43 — IsGrounded 영역 폐기 (frame 0 미설정 → 떨어짐). footHit 단독 + 점프 영역 OFF 강제
+            bool isJumpingThrough = jumpState == JumpState.Jumping
+                                    || (jumpState == JumpState.InFlight && velocity.y > 0.01f);
+
             bool standingOnPlatform = false;
-            if (collider2d != null && IsGrounded)
+            if (collider2d != null && !isJumpingThrough)
             {
                 Vector2 footPos = new Vector2(collider2d.bounds.center.x, collider2d.bounds.min.y + 0.02f);
                 int jumpThroughMask = 1 << JUMP_THROUGH_LAYER;