Commit before reorganising level generation

shader/lighting/lineShadow.frag

@@ -2,5 +2,5 @@
 out vec4 fColor;
 void main()
 {
-  fColor = vec4 (0.9,0.5,0,0);
+  fColor = vec4 (0,0,0,0);
 }

shader/lighting/lineShadow.geom

@@ -36,7 +36,9 @@ void main()
     // first test if the edge is part of the silhouette
     // that is, if the normals of the faces connected by the edge point in
     // "different directions" wrt the light direction
-    if ( dot(n0 , lightDir) * dot(n1 , lightDir) < 0 )
+    if ( dot(n0 , lightDir) * dot(n1 , lightDir) <= 0 ) 
+                // using <= rather than < seems to get rid of overlapping shadow
+                // artefacts
     {
         vec4 p2 = shiftNear(p0);
         vec4 p3 = shiftNear(p1);