From 79f7ebd7eb21acad8827f028b72ae2d49345007f Mon Sep 17 00:00:00 2001
From: Jarrod Doyle <thejarroddoyle@gmail.com>
Date: Mon, 5 Aug 2024 18:57:21 +0100
Subject: [PATCH] Re-add occlusion culling

---
 project/code/Mission.cs | 19 ++++++++++++++++---
 1 file changed, 16 insertions(+), 3 deletions(-)

diff --git a/project/code/Mission.cs b/project/code/Mission.cs
index 9ba5924..8b694eb 100644
--- a/project/code/Mission.cs
+++ b/project/code/Mission.cs
@@ -113,11 +113,11 @@ public partial class Mission : Node3D
 		};
 
 		MeshInstance3D mesh = GenerateMesh(surfaceArrays, material);
-		// OccluderInstance3D occluderInstance = GenerateOccluder(vertices, indices);
+		OccluderInstance3D occluderInstance = GenerateOccluder(surfaceArrays);
 
 		var cellNode = new Node3D();
 		cellNode.AddChild(mesh);
-		// cellNode.AddChild(occluderInstance);
+		cellNode.AddChild(occluderInstance);
 
 		AddChild(cellNode);
 	}
@@ -228,8 +228,21 @@ public partial class Mission : Node3D
 		return surfacesArrays;
 	}
 
-	private static OccluderInstance3D GenerateOccluder(List<Vector3> vertices, List<int> indices)
+	private static OccluderInstance3D GenerateOccluder(List<Godot.Collections.Array> surfaceArrays)
 	{
+		var vertices = new List<Vector3>();
+		var indices = new List<int>();
+		foreach (var array in surfaceArrays)
+		{
+			var count = vertices.Count;
+			vertices.AddRange(array[(int)Mesh.ArrayType.Vertex].As<Vector3[]>());
+			var surfaceIndices = array[(int)Mesh.ArrayType.Index].As<int[]>();
+			foreach (var idx in surfaceIndices)
+			{
+				indices.Add(count + idx);
+			}
+		}
+
 		var occluder = new ArrayOccluder3D();
 		occluder.SetArrays(vertices.ToArray(), indices.ToArray());
 		var occluderInstance = new OccluderInstance3D