diff -r 1d03dc1173cd -r 08dc62e03a6d src/gl/compiler.cpp
--- a/src/gl/compiler.cpp	Sun Feb 02 00:49:32 2020 +0200
+++ b/src/gl/compiler.cpp	Sun Feb 02 00:50:57 2020 +0200
@@ -224,7 +224,7 @@
 	else if (polygon.color == ldraw::edgeColor)
 	{
 		// Edge color is black, unless we have a dark background, in which case lines need to be bright.
-		color = Qt::black; //luma(config::backgroundColor()) > 40 ? Qt::black : Qt::white;
+		color = luma(preferences.backgroundColor) > (40.0 / 256.0) ? Qt::black : Qt::white;
 	}
 	else
 	{