diff --git a/ArchitectureColoredPainting/ArchitectureColoredPainting.vcxproj b/ArchitectureColoredPainting/ArchitectureColoredPainting.vcxproj
index c8babd2..334afac 100644
--- a/ArchitectureColoredPainting/ArchitectureColoredPainting.vcxproj
+++ b/ArchitectureColoredPainting/ArchitectureColoredPainting.vcxproj
@@ -31,7 +31,7 @@
     <Import Project="$(QtMsBuild)\qt_defaults.props" />
   </ImportGroup>
   <PropertyGroup Condition="'$(Configuration)|$(Platform)' == 'Debug|x64'" Label="QtSettings">
-    <QtInstall>5.15.0_msvc2019_64</QtInstall>
+    <QtInstall>5.15.2_msvc2019_64</QtInstall>
     <QtModules>core;gui;widgets</QtModules>
     <QtBuildConfig>debug</QtBuildConfig>
   </PropertyGroup>
diff --git a/ArchitectureColoredPainting/RendererWidget.cpp b/ArchitectureColoredPainting/RendererWidget.cpp
index b034184..70896ac 100644
--- a/ArchitectureColoredPainting/RendererWidget.cpp
+++ b/ArchitectureColoredPainting/RendererWidget.cpp
@@ -9,7 +9,7 @@
 
 //QVector3D lightPositions[] = { 2000 * QVector3D(0.2, 4, 1).normalized(), QVector3D(100,100,100) ,QVector3D(-100,100,100) ,QVector3D(100,100,-100) };
 QVector3D lightColors[] = { 20 * QVector3D(0.7529,0.7450,0.6784).normalized(), QVector3D(0,0,0) ,QVector3D(0,0,0) ,QVector3D(0,0,0) };
-static float sunPitch = 90, sunYaw = 80;
+static float sunPitch = 105, sunYaw = 80;
 static int sunSpeed = 10;
 
 RendererWidget::RendererWidget(QWidget* parent)
diff --git a/ArchitectureColoredPainting/Shaders/painting.comp b/ArchitectureColoredPainting/Shaders/painting.comp
index b27a2b3..0995dd6 100644
--- a/ArchitectureColoredPainting/Shaders/painting.comp
+++ b/ArchitectureColoredPainting/Shaders/painting.comp
@@ -765,7 +765,10 @@ bool drawElement(uint elementIndex, vec2 localUV, out vec3 color, inout vec3 deb
 										   elementData[pointsOffset + 2 * p2Index + 1]);
 							vec2 p3 = vec2(elementData[pointsOffset + 2 * p3Index],
 										   elementData[pointsOffset + 2 * p3Index + 1]);
-
+							if(distance(localUV, p0)<0.01)
+								if( bound.z==p0.x )
+									debugBVH = vec3(0,0,1);
+								else debugBVH = vec3(1,1,1);
 							if (p0 == p1 && p2 == p3)
 							{
 								num_its += segment_int_test(localUV, p0, p3);