Added a DebugDraw3D class, which currently draws an outline of a mesh's AABB.

src/liborng/nodes/debug_draw3d.cpp

@@ -0,0 +1,72 @@
+/*
+ * ©2026 Batty Bovine Productions, LLC. All Rights Reserved.
+ * 
+ * If this source code makes it to the public internet, this software can be
+ * considered to be protected by the MIT licence. Have fun with it.
+ */
+
+#include "debug_draw3d.h"
+
+#include "godot_cpp/variant/aabb.hpp"
+#include "godot_cpp/classes/immediate_mesh.hpp"
+#include "godot_cpp/classes/mesh_instance3d.hpp"
+#include "godot_cpp/classes/standard_material3d.hpp"
+using namespace godot;
+
+
+void DebugDraw3D::draw_aabb(Node3D *parent_node, const AABB &aabb, const Color &colour)
+{
+		Ref<StandardMaterial3D> material;
+		material.instantiate();
+		material->set_flag(BaseMaterial3D::FLAG_ALBEDO_FROM_VERTEX_COLOR, true);
+		material->set_shading_mode(BaseMaterial3D::SHADING_MODE_UNSHADED);
+		
+		ImmediateMesh *im = memnew(ImmediateMesh);
+		const Vector3 &aabb_position = aabb.get_position();
+		const Vector3 &aabb_size = aabb.get_size();
+		im->surface_begin(Mesh::PRIMITIVE_LINES, material);
+		im->surface_set_color(colour);
+		{
+			im->surface_add_vertex(aabb_position);
+			im->surface_add_vertex(aabb_position + Vector3(aabb_size.x, 0.0f, 0.0f));
+			
+			im->surface_add_vertex(aabb_position);
+			im->surface_add_vertex(aabb_position + Vector3(0.0f, aabb_size.y, 0.0f));
+			
+			im->surface_add_vertex(aabb_position + Vector3(aabb_size.x, 0.0f, 0.0f));
+			im->surface_add_vertex(aabb_position + Vector3(aabb_size.x, aabb_size.y, 0.0f));
+			
+			im->surface_add_vertex(aabb_position + Vector3(aabb_size.x, aabb_size.y, 0.0f));
+			im->surface_add_vertex(aabb_position + Vector3(0.0f, aabb_size.y, 0.0f));
+			
+			im->surface_add_vertex(aabb_position + Vector3(0.0f, 0.0f, aabb_size.z));
+			im->surface_add_vertex(aabb_position + Vector3(aabb_size.x, 0.0f, aabb_size.z));
+			
+			im->surface_add_vertex(aabb_position + Vector3(0.0f, 0.0f, aabb_size.z));
+			im->surface_add_vertex(aabb_position + Vector3(0.0f, aabb_size.y, aabb_size.z));
+			
+			im->surface_add_vertex(aabb_position + Vector3(aabb_size.x, 0.0f, aabb_size.z));
+			im->surface_add_vertex(aabb_position + Vector3(aabb_size.x, aabb_size.y, aabb_size.z));
+			
+			im->surface_add_vertex(aabb_position + Vector3(aabb_size.x, aabb_size.y, aabb_size.z));
+			im->surface_add_vertex(aabb_position + Vector3(0.0f, aabb_size.y, aabb_size.z));
+			
+			im->surface_add_vertex(aabb_position);
+			im->surface_add_vertex(aabb_position + Vector3(0.0f, 0.0f, aabb_size.z));
+			
+			im->surface_add_vertex(aabb_position + Vector3(aabb_size.x, 0.0f, 0.0f));
+			im->surface_add_vertex(aabb_position + Vector3(aabb_size.x, 0.0f, aabb_size.z));
+			
+			im->surface_add_vertex(aabb_position + Vector3(0.0f, aabb_size.y, 0.0f));
+			im->surface_add_vertex(aabb_position + Vector3(0.0f, aabb_size.y, aabb_size.z));
+			
+			im->surface_add_vertex(aabb_position + Vector3(aabb_size.x, aabb_size.y, 0.0f));
+			im->surface_add_vertex(aabb_position + Vector3(aabb_size.x, aabb_size.y, aabb_size.z));
+		}
+		im->surface_end();
+		
+		MeshInstance3D *mi = memnew(MeshInstance3D);
+		parent_node->add_child(mi);
+		mi->set_transform(Transform3D());
+		mi->set_mesh(im);
+}

src/liborng/nodes/debug_draw3d.h

@@ -0,0 +1,36 @@
+/*
+ * ©2026 Batty Bovine Productions, LLC. All Rights Reserved.
+ * 
+ * If this source code makes it to the public internet, this software can be
+ * considered to be protected by the MIT licence. Have fun with it.
+ */
+
+#pragma once
+
+#include <godot_cpp/classes/node3d.hpp>
+using namespace godot;
+
+#define DEBUG_DRAW3D_TAG "DebugDraw3D"
+
+
+class DebugDraw3D : public Node
+{
+	GDCLASS(DebugDraw3D, Node);
+	
+public:
+	DebugDraw3D(){}
+	~DebugDraw3D(){}
+	
+	static void draw_aabb(Node3D *parent_node, const AABB &aabb, const Color &colour);
+	
+protected:
+	
+private:
+	
+	// Godot boilerplate below
+protected:
+	static void _bind_methods()
+	{
+		ClassDB::bind_static_method("DebugDraw3D", D_METHOD("draw_aabb", "parent_node", "aabb", "colour"), &DebugDraw3D::draw_aabb);
+	}
+};