From 6383778ea4a5f1de02c7bc32d37abb7ab873551d Mon Sep 17 00:00:00 2001
From: Hanno Braun <hanno@braun-odw.eu>
Date: Thu, 4 Apr 2024 11:20:30 +0200
Subject: [PATCH] Prevent defining geometry for 2D space

---
 crates/fj-core/src/geometry/geometry.rs | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/crates/fj-core/src/geometry/geometry.rs b/crates/fj-core/src/geometry/geometry.rs
index 783ff7dc1..6a83194dd 100644
--- a/crates/fj-core/src/geometry/geometry.rs
+++ b/crates/fj-core/src/geometry/geometry.rs
@@ -14,6 +14,8 @@ pub struct Geometry {
     half_edge: BTreeMap<Handle<HalfEdge>, HalfEdgeGeom>,
     surface: BTreeMap<Handle<Surface>, SurfaceGeom>,
 
+    space_2d: Handle<Surface>,
+
     xy_plane: Handle<Surface>,
     xz_plane: Handle<Surface>,
     yz_plane: Handle<Surface>,
@@ -26,6 +28,8 @@ impl Geometry {
             half_edge: BTreeMap::new(),
             surface: BTreeMap::new(),
 
+            space_2d: topology.surfaces.space_2d(),
+
             xy_plane: topology.surfaces.xy_plane(),
             xz_plane: topology.surfaces.xz_plane(),
             yz_plane: topology.surfaces.yz_plane(),
@@ -69,6 +73,10 @@ impl Geometry {
         surface: Handle<Surface>,
         geometry: SurfaceGeom,
     ) {
+        if surface == self.space_2d {
+            panic!("Attempting to define geometry for 2D space");
+        }
+
         if self.surface.contains_key(&surface)
             && (surface == self.xy_plane
                 || surface == self.xz_plane