Group Holes with Hull Convex

demo/assets/scripts/environment/destructable/destructable_wall.gd

@@ -10,10 +10,11 @@ enum ExtrudeDirection {
 @export_category("TrechBroom Generated Values")
 @export var verts2d: PackedVector2Array
 @export var meshInstance3d: MeshInstance3D
-@export var extrusion_direction: ExtrudeDirection
 @export var depth: float = 0.1
 @export var depth_position_offset: Vector3 = Vector3.ZERO
-@export_category("User Defined Values")
+@export_category("TrechBroom User Values")
+@export var extrusion_direction: ExtrudeDirection
+@export var hole_proximity: float
 @export var edge_non_fracture: float = 0.1
 
 var parentNode
@@ -44,6 +45,8 @@ func _func_godot_apply_properties(entity_properties: Dictionary) -> void:
 	var verticies = meshInstance3d.mesh.surface_get_arrays(0)[Mesh.ARRAY_VERTEX]
 	
 	extrusion_direction = entity_properties["extrude_direction"]
+	hole_proximity = entity_properties["hole_proximity"]
+	edge_non_fracture = entity_properties["edge_non_fractured"]
 	
 	var depth_min: float
 	var depth_max: float
@@ -192,6 +195,24 @@ func _add_hole(new_hole: PackedVector2Array) -> bool:
 	var bound_rect = UTIL.get_bounding_rect(merged)
 	inner_rtree.add(bound_rect.position, bound_rect.end, hole.hole_id)
 	
+	var hole_prox_boundary = bound_rect.grow(hole.area * 4)
+	var prox_holes_ids = inner_rtree.query_rect(hole_prox_boundary.position, hole_prox_boundary.end)
+	
+	# any holes that are close in proximity convex hull
+	if len(prox_holes_ids) <= 1: # needs to be length 2 or more because it will always return the hole just created
+		return true
+	
+	var proxmity_hole_vectors = []
+	for id in prox_holes_ids:
+		proxmity_hole_vectors.append_array(inner_polygons.get_hole(id).vectors)
+		inner_rtree.remove(id)
+		inner_polygons.remove_hole(id)
+	
+	var convex_vectors = Geometry2D.convex_hull(proxmity_hole_vectors)
+	hole = inner_polygons.add_hole(convex_vectors)
+	bound_rect = UTIL.get_bounding_rect(convex_vectors)
+	inner_rtree.add(bound_rect.position, bound_rect.end, hole.hole_id)
+	
 	return true
 
 func _find_static_body():

demo/assets/scripts/environment/destructable/resource/hole.gd

@@ -3,11 +3,15 @@ extends Resource
 class_name Hole
 
 var hole_id: int
-var vectors: PackedVector2Array
+var vectors: PackedVector2Array # verticies
+var area: float
+
 
 func _init(hole_id: int, vectors: PackedVector2Array):
 	self.hole_id = hole_id
 	self.vectors = vectors
+	
+	self.area = UTIL.get_polygon_area(self.vectors)
 
 func center():
 	var avg_vert = Vector2.ZERO

demo/assets/scripts/environment/destructable/util.gd

@@ -25,3 +25,13 @@ static func get_bounding_rect(vectors: PackedVector2Array) -> Rect2:
 		
 	# The 'position' of the Rect2 will be the minimum corner
 	return rect
+
+static func get_polygon_area(vectors: PackedVector2Array) -> float:
+	var result := 0.0
+	var num_vertices := vectors.size()
+	
+	for q in range(num_vertices):
+		var p = (q - 1 + num_vertices) % num_vertices
+		result += vectors[q].cross(vectors[p])
+	
+	return abs(result * 0.5)