From 24c74aa225152f8041cb87e6e9f4a3cbbb2be133 Mon Sep 17 00:00:00 2001
From: Langtanium <94726057+Langtanium@users.noreply.github.com>
Date: Tue, 14 Apr 2026 16:30:16 -0700
Subject: [PATCH] Added skin box hide bit functionality

Added code to hide skin boxes when wearing a helmet if bit for said functionality is present.
---
 Minecraft.Client/HumanoidModel.cpp  | 1 +
 Minecraft.Client/ModelPart.cpp      | 1 +
 Minecraft.Client/ModelPart.h        | 1 +
 Minecraft.Client/PlayerRenderer.cpp | 4 +++-
 4 files changed, 6 insertions(+), 1 deletion(-)

diff --git a/Minecraft.Client/HumanoidModel.cpp b/Minecraft.Client/HumanoidModel.cpp
index a790861f..f5d31924 100644
--- a/Minecraft.Client/HumanoidModel.cpp
+++ b/Minecraft.Client/HumanoidModel.cpp
@@ -109,6 +109,7 @@ ModelPart * HumanoidModel::AddOrRetrievePart(SKIN_BOX *pBox)
 		pNewBox = new ModelPart(this, static_cast<int>(pBox->fU), static_cast<int>(pBox->fV));
 		pNewBox->visible=false;
 		if (pBox->fM > 0) pNewBox->bMirror = true; // check if this box has the mirror flag
+		if (pBox->fA > 0) pNewBox->hideWithHelmet = true; // check if this box has the "hide when helmet" is worn flag
 		pNewBox->addHumanoidBox(pBox->fX, pBox->fY, pBox->fZ, pBox->fW, pBox->fH, pBox->fD, scale);
 		// 4J-PB - don't compile here, since the lighting isn't set up. It'll be compiled on first use.
 		//pNewBox->compile(1.0f/16.0f);	
diff --git a/Minecraft.Client/ModelPart.cpp b/Minecraft.Client/ModelPart.cpp
index e423a4ae..8a39dbf4 100644
--- a/Minecraft.Client/ModelPart.cpp
+++ b/Minecraft.Client/ModelPart.cpp
@@ -13,6 +13,7 @@ void ModelPart::_init()
 	compiled=false;
 	bMirror = false;
 	visible = true;
+	hideWithHelmet = false;
 	neverRender = false;
 	x=y=z = 0.0f;
 	xRot=yRot=zRot = 0.0f;
diff --git a/Minecraft.Client/ModelPart.h b/Minecraft.Client/ModelPart.h
index c6458e71..7ba7cb39 100644
--- a/Minecraft.Client/ModelPart.h
+++ b/Minecraft.Client/ModelPart.h
@@ -16,6 +16,7 @@ public:
 	float xRot, yRot, zRot;
 	bool bMirror;
 	bool visible;
+	bool hideWithHelmet;
 	bool neverRender;
     vector <Cube *> cubes;
     vector <ModelPart *> children;
diff --git a/Minecraft.Client/PlayerRenderer.cpp b/Minecraft.Client/PlayerRenderer.cpp
index e0973da9..61a0af8f 100644
--- a/Minecraft.Client/PlayerRenderer.cpp
+++ b/Minecraft.Client/PlayerRenderer.cpp
@@ -258,7 +258,9 @@ void PlayerRenderer::render(shared_ptr<Entity> _mob, double x, double y, double
 	{
 		for(ModelPart *pModelPart : *pAdditionalModelParts)
 		{
-			pModelPart->visible=true;
+			shared_ptr<ItemInstance> itemInstance = mob->inventory->getArmor(3);
+			if (itemInstance == nullptr || !pModelPart->hideWithHelmet)
+				pModelPart->visible=true;
 		}
 	}