calculate normal matrix once in cpp (performance),

added bool variable to turn light on/off (still needs button),

QtMeshViewer/Source/GeometryEngine.cpp

@@ -191,6 +191,9 @@ void GeometryEngine::drawGeometry(QOpenGLShaderProgram *program, bool wireframe)
 		// Set model matrix
 		program->setUniformValue("m_matrix", it.modelMatrix);
 
+		// Set normal matrix
+		program->setUniformValue("n_matrix", (normMatrix * it.modelMatrix).normalMatrix());
+
 		// decide if this is transparent
 		program->setUniformValue("b_transparent", tmp_transparent);
 

QtMeshViewer/Source/OglViewerWidget.cpp

@@ -226,7 +226,8 @@ void OglViewerWidget::paintGL()
 	// Set view-projection matrix
 	m_program.setUniformValue("vp_matrix", m_projection * view);
 
-	// Set Light
+	// Set Light values
+	m_program.setUniformValue("b_light", m_lightOn);
 	m_program.setUniformValue("light.position", m_light.position);
 	m_program.setUniformValue("light.intensities", m_light.intensities);