From 8ce5b04cdb7ef85668af840411c5e2eb7581f7cb Mon Sep 17 00:00:00 2001
From: Mugen87 <michael.herzog@human-interactive.org>
Date: Wed, 22 May 2024 11:59:15 +0200
Subject: [PATCH] USDZExporter: Add `normalScale` support.

---
 examples/jsm/exporters/USDZExporter.js | 32 +++++++++++++++++++++++---
 1 file changed, 29 insertions(+), 3 deletions(-)

diff --git a/examples/jsm/exporters/USDZExporter.js b/examples/jsm/exporters/USDZExporter.js
index 5520d92910d89b..4ba95092072a2d 100644
--- a/examples/jsm/exporters/USDZExporter.js
+++ b/examples/jsm/exporters/USDZExporter.js
@@ -467,7 +467,7 @@ function buildMaterial( material, textures, quickLookCompatible = false ) {
 	const inputs = [];
 	const samplers = [];
 
-	function buildTexture( texture, mapType, color ) {
+	function buildTexture( texture, mapType, scale = null ) {
 
 		const id = texture.source.id + '_' + texture.flipY;
 
@@ -537,7 +537,7 @@ function buildMaterial( material, textures, quickLookCompatible = false ) {
 			uniform token info:id = "UsdUVTexture"
 			asset inputs:file = @textures/Texture_${ id }.png@
 			float2 inputs:st.connect = </Materials/Material_${ material.id }/Transform2d_${ mapType }.outputs:result>
-			${ color !== undefined ? 'float4 inputs:scale = ' + buildColor4( color ) : '' }
+			${ scale !== null ? 'float4 inputs:scale = ' + buildScale( scale, mapType ) : '' }
 			token inputs:sourceColorSpace = "${ texture.colorSpace === NoColorSpace ? 'raw' : 'sRGB' }"
 			token inputs:wrapS = "${ WRAPPINGS[ texture.wrapS ] }"
 			token inputs:wrapT = "${ WRAPPINGS[ texture.wrapT ] }"
@@ -596,7 +596,7 @@ function buildMaterial( material, textures, quickLookCompatible = false ) {
 
 		inputs.push( `${ pad }normal3f inputs:normal.connect = </Materials/Material_${ material.id }/Texture_${ material.normalMap.id }_normal.outputs:rgb>` );
 
-		samplers.push( buildTexture( material.normalMap, 'normal' ) );
+		samplers.push( buildTexture( material.normalMap, 'normal', material.normalScale ) );
 
 	}
 
@@ -673,6 +673,26 @@ ${ samplers.join( '\n' ) }
 
 }
 
+function buildScale( scale, mapType ) {
+
+	let value;
+
+	switch ( mapType ) {
+
+		case 'diffuse':
+			value = buildColor4( scale );
+			break;
+
+		case 'normal':
+			value = buildNormalScale( scale );
+			break;
+
+	}
+
+	return value;
+
+}
+
 function buildColor( color ) {
 
 	return `(${ color.r }, ${ color.g }, ${ color.b })`;
@@ -691,6 +711,12 @@ function buildVector2( vector ) {
 
 }
 
+function buildNormalScale( normalScale ) {
+
+	return `(${ normalScale.x }, ${ normalScale.y }, 1.0, 1.0)`;
+
+}
+
 
 function buildCamera( camera ) {