--- a/src/glcompiler.cpp	Wed Apr 25 18:55:15 2018 +0300
+++ b/src/glcompiler.cpp	Fri Apr 27 16:27:14 2018 +0300
@@ -168,6 +168,10 @@
 		// Use the constant red color for BFC back colors
 		return {208, 64, 64};
 
+	case VboSubclass::BlackColors:
+		// Use a constant black color for black colors.
+		return Qt::black;
+
 	case VboSubclass::PickColors:
 		// For the picking scene, use unique picking colors provided by the model.
 		return m_renderer->model()->pickingColorForObject(polygonOwnerIndex);