diff --git a/Core/World/Geometry/Sectors/Sector3D.cs b/Core/World/Geometry/Sectors/Sector3D.cs
index 8172e8fe0..c29563da0 100644
--- a/Core/World/Geometry/Sectors/Sector3D.cs
+++ b/Core/World/Geometry/Sectors/Sector3D.cs
@@ -26,7 +26,7 @@ public enum SectorFlags3D
     DisableLighting = 128,
     RestrictLighting = 256,
     Fog = 512,
-    Model = 1024,
+    CeilingModel = 1024,
     UseParentUpperTexture = 2048,
     UseParentLowerTexture = 4096,
     AdditiveTransparency = 8192,
@@ -129,7 +129,7 @@ public Sector3D(IWorld world, int parentSectorId, Sector parentSector, Sector co
         ParentSector = parentSector;
         ControlSector = controlSector;
         ControlTop = controlSector.Ceiling;
-        ControlBottom = controlSector.Floor;
+        ControlBottom = (flags & SectorFlags3D.CeilingModel) == 0 ? controlSector.Floor : controlSector.Ceiling;
         LightTop = ParentSector;
         LightBottom = ParentSector;
         Flags = flags;
diff --git a/Tests/Resources/sector3d-map.zip b/Tests/Resources/sector3d-map.zip
index 1805a20ea..9b09cc63b 100644
Binary files a/Tests/Resources/sector3d-map.zip and b/Tests/Resources/sector3d-map.zip differ
diff --git a/Tests/Unit/GameAction/3DSector/Sector3D_Map.cs b/Tests/Unit/GameAction/3DSector/Sector3D_Map.cs
index 92747afc9..8cb56dff8 100644
--- a/Tests/Unit/GameAction/3DSector/Sector3D_Map.cs
+++ b/Tests/Unit/GameAction/3DSector/Sector3D_Map.cs
@@ -1,9 +1,6 @@
 using FluentAssertions;
-using Helion.Geometry.Vectors;
 using Helion.Render.OpenGL.Renderers.Legacy.World.Data;
 using Helion.Resources.IWad;
-using Helion.Tests.Unit.GameAction.Mbf21;
-using Helion.World.Cheats;
 using Helion.World.Entities.Players;
 using Helion.World.Geometry.Sectors;
 using Helion.World.Geometry.Sides;
@@ -271,6 +268,26 @@ public void OverlappingNonSolidWallsWithNormalGeometry()
         higher3D.CalculateWallHeights(GameActions.GetLine(World, 134).Front, out _).Should().BeFalse();
     }
 
+    [Fact(DisplayName = "Sector3D CeilingModel flag")]
+    public void CeilingModel()
+    {
+        var sector = GameActions.GetSectorByTag(World, 73);
+        sector.Sectors3D.Length.Should().Be(2);
+
+        var controlSector1 = GameActions.GetSector(World, 243);
+        var controlSector2 = GameActions.GetSector(World, 242);
+
+        sector.Sectors3D[0].Flags.Should().Be(SectorFlags3D.Swim | SectorFlags3D.RenderInside | SectorFlags3D.CeilingModel);
+        sector.Sectors3D[1].Flags.Should().Be(SectorFlags3D.Swim | SectorFlags3D.RenderInside | SectorFlags3D.CeilingModel);
+
+        // Renders both top and bottom as the control sector's ceiling. This simply means both control top and bottom are set to the control sector's ceiling.
+        sector.Sectors3D[0].ControlTop.Should().Be(controlSector1.Ceiling);
+        sector.Sectors3D[0].ControlBottom.Should().Be(controlSector1.Ceiling);
+
+        sector.Sectors3D[1].ControlTop.Should().Be(controlSector2.Ceiling);
+        sector.Sectors3D[1].ControlBottom.Should().Be(controlSector2.Ceiling);
+    }
+
     private static void AssertWallHeights(WallHeights wallHeights, double bottomZ, double topZ)
     {
         wallHeights.TopZ.Should().Be(topZ);