diff -r 8e1c9f18ae15 -r 24275a4064f4 src/gl/common.h
--- a/src/gl/common.h	Tue Jul 27 16:29:00 2021 +0300
+++ b/src/gl/common.h	Wed Jul 28 08:23:09 2021 +0300
@@ -189,7 +189,9 @@
 		// Use a different colour for each object
 		RandomColors,
 		// Render so that the colour of an object has an one to one correspondence with its id
-		PickScene
+		PickScene,
+		// Render a scene where vertices can be picked
+		VertexPickScene,
 	};
 	
 	// Different ways to render fragments.
@@ -206,6 +208,8 @@
 		RandomColors = 3,
 		// Use a colour that codes the object's id
 		Id = 4,
+		// Render everything black
+		Black = 5,
 	};
 
 	// User options for rendering