diff --git a/src/editor/map_renderer.rs b/src/editor/map_renderer.rs
index b8df35e9..6fb220f0 100644
--- a/src/editor/map_renderer.rs
+++ b/src/editor/map_renderer.rs
@@ -112,7 +112,13 @@ impl MapRenderer {
         let midpoint = ::std::time::Instant::now();
 
         // z sort - TODO: use depth buffer instead?
-        atoms.sort_by_key(|a| minimap::layer_of(objtree, a));
+
+        atoms.sort_by(|a, b| {
+            match minimap::plane_of(objtree, a).cmp(&minimap::plane_of(objtree, b)) {
+                ::std::cmp::Ordering::Equal => minimap::layer_of(objtree, a).cmp(&minimap::layer_of(objtree, b)),
+                other => other
+            }
+        });
 
         // render atoms
         let mut vertices = Vec::new();
diff --git a/src/tools/minimap.rs b/src/tools/minimap.rs
index bd0cfd21..4cd1d261 100644
--- a/src/tools/minimap.rs
+++ b/src/tools/minimap.rs
@@ -400,6 +400,17 @@ fn fancy_layer_of(objtree: &ObjectTree, atom: &Atom) -> i32 {
     }
 }
 
+pub fn plane_of(objtree: &ObjectTree, atom: &Atom) -> i32 {
+    match atom.get_var("plane", objtree) {
+        &Constant::Int(i) => (i % 1000) * 1000,
+        &Constant::Float(f) => ((f % 1000.) * 1000.) as i32,
+        other => {
+            eprintln!("not a plane: {:?} on {:?}", other, atom.type_.path);
+            2_000
+        }
+    }
+}
+
 pub fn layer_of(objtree: &ObjectTree, atom: &Atom) -> i32 {
     match atom.get_var("layer", objtree) {
         &Constant::Int(i) => (i % 1000) * 1000,