fixed the light problem,

very basic light at the moment, needs a lot of work:
- custom position,
- custom intensities,
- calculate at better positions,
others:
- adjust zoom speed

QtMeshViewer/Source/OglViewerWidget.cpp

@@ -179,7 +179,8 @@ void OglViewerWidget::initializeGL()
 {
 	initializeOpenGLFunctions();
 
-	glClearColor(0.5000f, 0.8000f, 1.0000f, 0.0000f);
+	//glClearColor(0.5000f, 0.8000f, 1.0000f, 0.0000f);
+	glClearColor(0.02f, 0.01f, 0.01f, 0.0000f);
 
 	initShaders();