From 6dc6297b7b85d390b4f51abdd9fe2aea034f7668 Mon Sep 17 00:00:00 2001
From: Jarrod Doyle <thejarroddoyle@gmail.com>
Date: Mon, 22 Jul 2024 19:52:40 +0100
Subject: [PATCH] Add occlusion culling

---
 project.godot           |  4 ++++
 project/code/Mission.cs | 15 +++++++++++++--
 2 files changed, 17 insertions(+), 2 deletions(-)

diff --git a/project.godot b/project.godot
index acd8310..564cf6a 100644
--- a/project.godot
+++ b/project.godot
@@ -18,3 +18,7 @@ config/icon="res://icon.svg"
 [dotnet]
 
 project/assembly_name="Thief Mission Viewer"
+
+[rendering]
+
+occlusion_culling/use_occlusion_culling=true
diff --git a/project/code/Mission.cs b/project/code/Mission.cs
index c3eb83b..e7fbd20 100644
--- a/project/code/Mission.cs
+++ b/project/code/Mission.cs
@@ -120,6 +120,8 @@ public partial class Mission : Node3D
 			idxOffset += poly.VertexCount;
 		}
 
+		var cellNode = new Node3D();
+
 		var arrMesh = new ArrayMesh();
 		var arrays = new Godot.Collections.Array();
 		arrays.Resize((int)Mesh.ArrayType.Max);
@@ -133,7 +135,14 @@ public partial class Mission : Node3D
 			Mesh = arrMesh,
 			CastShadow = GeometryInstance3D.ShadowCastingSetting.On
 		};
-		AddChild(meshInstance);
+		cellNode.AddChild(meshInstance);
+
+		var occluderInstance = new OccluderInstance3D();
+		var occluder = new ArrayOccluder3D();
+		occluder.SetArrays(vertices.ToArray(), indices.ToArray());
+		occluderInstance.Occluder = occluder;
+		cellNode.AddChild(occluderInstance);
+
 
 		var r = new Random();
 		if (r.NextSingle() > 0.9 && cell.SphereRadius > 5.0)
@@ -143,7 +152,9 @@ public partial class Mission : Node3D
 				Position = cell.SphereCenter.ToGodotVec3(4.0f),
 				OmniRange = cell.SphereRadius * (r.NextSingle() + 1.0f) * 0.5f,
 			};
-			AddChild(light);
+			cellNode.AddChild(light);
 		}
+
+		AddChild(cellNode);
 	}
 }
\ No newline at end of file