diff --git a/src/Model.cpp b/src/Model.cpp
index fd15432..352c7f6 100755
--- a/src/Model.cpp
+++ b/src/Model.cpp
@@ -223,6 +223,8 @@ void Model::getSimilarVertexIndex()
 				{
 					glm::vec3 tempNormal, tempTangent, tempBiTangent;
 
+					if(glm::dot(Normals[i], Normals[t]) > 0)
+					{
 					tempNormal = Normals[i] + Normals[t];
 					tempTangent = TangentNormals[i] + TangentNormals[t];
 					tempBiTangent = BiTangentNormals[i] + BiTangentNormals[t];
@@ -235,6 +237,7 @@ void Model::getSimilarVertexIndex()
 
 					BiTangentNormals[i] = tempBiTangent;
 					BiTangentNormals[t] = tempBiTangent;
+					}
 				}
 			}
 		}
diff --git a/src/Renderer.cpp b/src/Renderer.cpp
index 900e30f..a73acf3 100755
--- a/src/Renderer.cpp
+++ b/src/Renderer.cpp
@@ -22,7 +22,7 @@ Renderer::Renderer(std::shared_ptr<::ResourceManager> resourceManager)
 	LAtt = 0.0f;
 	QAtt = 3.0f;
 	m_ShadowMapRes = 1;
-	m_SunPosition = glm::vec3(0.f, 1.0f, 0.5f);
+	m_SunPosition = glm::vec3(0.f, 1.0f, 0.7f);
 	m_SunTarget = glm::vec3(0, 0, 0);
 	m_SunProjection_height = glm::vec2(-40.f, 40.f);
 	m_SunProjection_width = glm::vec2(-40.f, 40.f);
diff --git a/src/Shaders/SunPass.frag.glsl b/src/Shaders/SunPass.frag.glsl
index 1625d47..3604e1f 100644
--- a/src/Shaders/SunPass.frag.glsl
+++ b/src/Shaders/SunPass.frag.glsl
@@ -49,7 +49,7 @@ vec4 phong(vec3 position, vec3 normal, vec3 specular)
 	float specularFactorSun = pow(dotSpecular, specularExponent);
 	vec3 sIs = specular.r * SunSpecularLight * specularFactorSun;
 
-	return vec4((sId), sIs.r);
+	return vec4((sId + La), sIs.r);
 }
 
 void main()