diff --git a/ArchitectureColoredPainting/res/Shaders/model.frag b/ArchitectureColoredPainting/res/Shaders/model.frag
index 420b814..df9c1e5 100644
--- a/ArchitectureColoredPainting/res/Shaders/model.frag
+++ b/ArchitectureColoredPainting/res/Shaders/model.frag
@@ -50,6 +50,8 @@ void main()
         gNormal = getNormalFromMap();
     else
         gNormal = Normal;
+    if(!gl_FrontFacing)
+        gNormal = -gNormal;
     if(texture_metallic_roughness_available)
         gMetallicRoughness = texture(texture_metallic_roughness, TexCoords).bg;
     else
diff --git a/ArchitectureColoredPainting/res/Shaders/shadow_mapping.comp b/ArchitectureColoredPainting/res/Shaders/shadow_mapping.comp
index a7410c9..f65c5f6 100644
--- a/ArchitectureColoredPainting/res/Shaders/shadow_mapping.comp
+++ b/ArchitectureColoredPainting/res/Shaders/shadow_mapping.comp
@@ -204,9 +204,6 @@ void main()
 
 	vec3 V = normalize(camPos - worldPos);
 
-	if(dot(V, normal)<0)
-		normal = -normal;
-
 	vec3 F0 = vec3(0.04); 
 	F0 = mix(F0, albedo, metallic);
 
diff --git a/ArchitectureColoredPainting/src/Editor/util/PaintingUtil.cpp b/ArchitectureColoredPainting/src/Editor/util/PaintingUtil.cpp
index a46ffa4..6708558 100644
--- a/ArchitectureColoredPainting/src/Editor/util/PaintingUtil.cpp
+++ b/ArchitectureColoredPainting/src/Editor/util/PaintingUtil.cpp
@@ -91,7 +91,7 @@ void PaintingUtil::handleLayerWrapper(LayerWrapper* nowLayer, QTransform transfo
 		//qDebug() << leafLayer<<"------" << painterPath;
 		// transform to -1£¬ 1
 		QTransform trans;
-		double maxLen = (std::max(bound.width(), bound.height()) + 2 * maxWidth) * 1.00001 * 2;
+		double maxLen = (std::max(bound.width(), bound.height()) + 2 * maxWidth) * 1.00001 / 2;
 		//qDebug() << maxLen << bound;
 		trans.scale(1 / maxLen, 1 / maxLen);
 		trans.translate(-bound.center().x(), -bound.center().y());