added transparency support,

need to sort the transparent things to the back

QtMeshViewer/Resources/fshader.glsl

@@ -11,5 +11,7 @@ varying vec2 v_texcoord;
 void main()
 {
 	// Set fragment color from texture
-	gl_FragColor = texture2D(texture, v_texcoord);
+	vec4 finalColor = vec4(texture2D(texture, v_texcoord));
+
+	gl_FragColor = finalColor;
 }

QtMeshViewer/Source/OglViewerWidget.cpp

@@ -187,7 +187,11 @@ void OglViewerWidget::initializeGL()
 	glEnable(GL_DEPTH_TEST);
 
 	// Enable back face culling
-	glEnable(GL_CULL_FACE);
+	//glEnable(GL_CULL_FACE);
+
+	// Enable transparency
+	glEnable(GL_BLEND);
+	glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
 
 	m_dataEngine = new GeometryEngine(this);
 	setConnections();