some greyboxing attempt

tools/generate_collisions.gd

@@ -0,0 +1,32 @@
+@tool
+extends Node3D
+
+@export_tool_button("Clear collisions", "Callable") var clear_col_action = clear_collisions
+@export_tool_button("Generate collisions", "Callable") var generate_col_action = generate_collisions
+
+func get_all_children_of_type(node, type) -> Array:
+	var nodes : Array = []
+	for child in node.get_children():
+		if is_instance_of(child, type):
+			nodes.append(child)
+		if child.get_child_count() > 0:
+			nodes.append_array(get_all_children_of_type(child, type))
+	return nodes
+
+func clear_collisions_on_meshes(meshes: Array):
+	for mesh_instance: MeshInstance3D in meshes:
+		for child in mesh_instance.get_children():
+			child.queue_free()
+
+func generate_collisions_on_meshes(meshes: Array):
+	for mesh_instance: MeshInstance3D in meshes:
+		mesh_instance.create_trimesh_collision()
+
+func generate_collisions():
+	var mesh_instances = get_all_children_of_type(self, MeshInstance3D)
+	clear_collisions_on_meshes(mesh_instances)
+	generate_collisions_on_meshes(mesh_instances)
+
+func clear_collisions():
+	var mesh_instances = get_all_children_of_type(self, MeshInstance3D)
+	clear_collisions_on_meshes(mesh_instances)