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Cutting Holes Into Mesh

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We be cutting holes :)
This commit is contained in:
Collin Campbell
2025-11-09 16:17:04 -05:00
parent 2d0408c09e
commit c6e4d4f725
12 changed files with 176 additions and 73 deletions
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15
demo/main.tscn
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@@ -1,19 +1,24 @@
[gd_scene load_steps=3 format=3 uid="uid://dvgdgi3jrhrvt"]
[gd_scene load_steps=4 format=3 uid="uid://dvgdgi3jrhrvt"]
[ext_resource type="Script" uid="uid://dysaws7hlg4td" path="res://scripts/test.gd" id="1_ig7tw"]
[ext_resource type="Script" uid="uid://cs057402w7w17" path="res://scripts/camera.gd" id="2_0xm2m"]
[ext_resource type="Script" uid="uid://42cwsrh6jyns" path="res://scripts/destructable_wall.gd" id="3_h2yge"]
[sub_resource type="Environment" id="Environment_ig7tw"]
[node name="Node3D" type="Node3D"]
script = ExtResource("1_ig7tw")
[node name="DirectionalLight3D" type="DirectionalLight3D" parent="."]
transform = Transform3D(0.8192554, 0.57171863, 0.04425077, 0.028913066, 0.03588575, -0.9989376, -0.5726993, 0.81966454, 0.012869433, 0, 0.54785013, 6.354968)
transform = Transform3D(0.8192555, 0.5717188, 0.044250764, -0.5075839, 0.7589243, -0.40791288, -0.2667944, 0.31172383, 0.91194814, 0, 0.54785013, 6.354968)
shadow_enabled = true
[node name="WorldEnvironment" type="WorldEnvironment" parent="."]
environment = SubResource("Environment_ig7tw")
[node name="Camera3D" type="Camera3D" parent="."]
transform = Transform3D(1, 0, 0, 0, 0.99687606, -0.078981146, 0, 0.078981146, 0.99687606, 1.3097496, 0.96856904, 8.280736)
transform = Transform3D(1, 0, 0, 0, 1, 0, 0, 0, 1, 1.546, 1, 1.6508019)
current = true
script = ExtResource("2_0xm2m")
[node name="Wall" type="Node3D" parent="."]
script = ExtResource("3_h2yge")
outer_polygon = PackedVector2Array(0, 2, 2, 2, 2, 0, 0, 0)

8
demo/project.godot
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@@ -18,3 +18,11 @@ config/icon="res://icon.svg"
[debug_draw_3d]
settings/addon_root_folder="res://addons/debug_draw_3d"
[input]
left_click={
"deadzone": 0.2,
"events": [Object(InputEventMouseButton,"resource_local_to_scene":false,"resource_name":"","device":-1,"window_id":0,"alt_pressed":false,"shift_pressed":false,"ctrl_pressed":false,"meta_pressed":false,"button_mask":0,"position":Vector2(0, 0),"global_position":Vector2(0, 0),"factor":1.0,"button_index":1,"canceled":false,"pressed":false,"double_click":false,"script":null)
]
}

23
demo/scripts/camera.gd Normal file
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@@ -0,0 +1,23 @@
extends Camera3D
signal wall_hit(wall_id, position, cutter)
func shoot_ray() -> Dictionary:
var mouse_position = get_viewport().get_mouse_position()
var ray_length = 1000
var from = project_ray_origin(mouse_position)
var to = from + project_ray_normal(mouse_position) * ray_length
var space = get_world_3d().direct_space_state
var ray_query = PhysicsRayQueryParameters3D.new()
ray_query.from = from
ray_query.to = to
var raycast_result = space.intersect_ray(ray_query)
return raycast_result
func _input(event: InputEvent) -> void:
if event.is_action_pressed("left_click"):
var query_result = shoot_ray()
if query_result:
var cutter: PackedVector2Array = Cutter.circleCutter()
wall_hit.emit(query_result["collider_id"], query_result["position"], cutter)

1
demo/scripts/camera.gd.uid Normal file
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@@ -0,0 +1 @@
uid://cs057402w7w17

24
demo/scripts/cutters.gd Normal file
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@@ -0,0 +1,24 @@
extends Node
class_name Cutter
static func circleCutter(num_sides = 10, perimerter_length = 0.5) -> PackedVector2Array:
var line_length: float = perimerter_length/num_sides
var line_angle: float = 360.0/num_sides
var current_angle: float = 0.0
var vectors: PackedVector2Array
for i in num_sides:
var vector: Vector2 = Vector2.ZERO
if i == 0:
current_angle += line_angle
vector = Vector2(line_length * cos(deg_to_rad(current_angle)), line_length * sin(deg_to_rad(current_angle)))
vectors.append(vector)
else:
current_angle += line_angle
vector = Vector2(vectors[i-1].x + line_length * cos(deg_to_rad(current_angle)), vectors[i-1].y + line_length * sin(deg_to_rad(current_angle)))
vectors.append(vector)
return vectors

1
demo/scripts/cutters.gd.uid Normal file
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@@ -0,0 +1 @@
uid://cd5la8wwjk34w

103
demo/scripts/destructable_wall.gd Normal file
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@@ -0,0 +1,103 @@
extends Node
@export var outer_polygon: PackedVector2Array
@export var inner_polygons: Array[PackedVector2Array]
@export var edge_non_fracture: float = 0.1
@onready var camera: Camera3D = get_node("/root/Node3D/Camera3D")
@onready var meshInstance = MeshInstance3D.new()
@onready var parentNode = get_node("..")
var depth: float:
set(value):
if value > 0:
depth = -value
depth = value
var static_body: StaticBody3D
func _ready() -> void:
assert(camera, "camera was not found")
assert(len(outer_polygon) > 2, "outer polygon does not meet the required length")
camera.connect("wall_hit", _handle_hit_signal)
self.add_child(meshInstance)
_draw()
func _draw():
var vector_indexes = GeoPolyTriangulization.triangulate(outer_polygon, inner_polygons)
var vectors = []
vectors.append_array(outer_polygon)
for ip in inner_polygons:
vectors.append_array(ip)
var meshGenerator = GeoPolyMesh.new(vector_indexes, vectors)
var mesh = meshGenerator.commit_mesh()
meshInstance.mesh = mesh
meshInstance.create_trimesh_collision()
static_body = _find_static_body()
func _re_draw():
meshInstance.remove_child(static_body)
static_body.queue_free()
var vector_indexes = GeoPolyTriangulization.triangulate(outer_polygon, inner_polygons)
var vectors = []
vectors.append_array(outer_polygon)
for ip in inner_polygons:
vectors.append_array(ip)
var meshGenerator = GeoPolyMesh.new(vector_indexes, vectors)
var mesh = meshGenerator.commit_mesh()
meshInstance.mesh = mesh
meshInstance.create_trimesh_collision()
static_body = _find_static_body()
func _handle_hit_signal(wall_id: int, position: Vector3, cutter: PackedVector2Array):
# validate that the hit was to this wall, if not return
if wall_id != static_body.get_instance_id():
return
var hole_position_offset = self.position + position
var hole_vector2_offset = Vector2(hole_position_offset.x, hole_position_offset.y)
# translate the cutter
var hole_vectors = Transform2D(0, hole_vector2_offset) * cutter
_add_hole(hole_vectors)
_re_draw()
func _add_hole(new_hole: PackedVector2Array):
var values_to_remove = []
var merged: PackedVector2Array = new_hole
for index in range(len(self.inner_polygons)):
var result = Geometry2D.merge_polygons(merged, self.inner_polygons[index])
if len(result) == 1:
merged = result[0]
values_to_remove.append(self.inner_polygons[index])
elif len(result) > 1:
# need to check that they have no overlapping area if they do clip
var overlap = Geometry2D.intersect_polygons(result[0], result[1])
if len(overlap) != 0:
merged = Geometry2D.clip_polygons(result[0], result[1])[0]
values_to_remove.append(self.inner_polygons[index])
for i in values_to_remove:
self.inner_polygons.erase(i)
inner_polygons.append(merged)
func _find_static_body():
for child in meshInstance.get_children():
if child is StaticBody3D:
return child

1
demo/scripts/destructable_wall.gd.uid Normal file
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@@ -0,0 +1 @@
uid://42cwsrh6jyns

8
demo/scripts/geometry/geopolymesh.gd
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@@ -14,8 +14,8 @@ var _v_points = []
var edges = {}
func _init(vector_indexes: PackedInt32Array, vector_points: PackedVector2Array, depth: float = -2.0):
assert(len(vector_indexes) % 3 == 0, "Number of vertex points is not divisible by 3, invalid triangle verticies")
func _init(vector_indexes: PackedInt32Array, vector_points: PackedVector2Array, depth: float = -0.1):
assert(len(vector_indexes) % 3 == 0 && len(vector_indexes) != 0, "Number of vertex points is not divisible by 3, invalid triangle verticies")
surface_array.resize(Mesh.ARRAY_MAX)
self._v_indexes = vector_indexes
@@ -39,7 +39,6 @@ func calculate_area(mesh_vertices: PackedVector2Array) -> float:
return result * 0.5
# edges are any verticies that share only on triangle
func _pre_process_edges():
var faces = UTIL.chunk_array(self._v_indexes, 3)
@@ -144,9 +143,6 @@ func _draw_sides(depth: float):
var v3 = self._v_points[outline_edges_ordered[outline_vector_ind + 1]]+ Vector3(0, 0, depth)
var n1 = self._calc_triangle_normal(v2, v1, v0)
#
#print(v0, ", ", v1, ", ", v2, ", ", v3)
#print(n1)
self.verts.append_array([v0, v1, v2, v1, v3, v2])
self.normals.append_array([n1, n1, n1, n1, n1, n1])

35
demo/scripts/geometry/geopolytriangulization.gd
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@@ -4,37 +4,8 @@ extends Node
# a triangulized Polygon with holes
class_name GeoPolyTriangulization
# triangles are made by 3 vector
const CHUNK_RESULT: int = 3
# the boundary polygon
var _outer_polygon: PackedVector2Array
# inner polygons (holes)
var _inner_polygons: Array[PackedVector2Array]
# all vector points defined by outer and inner polygons
var vectors: PackedVector2Array = []
var _edge_safety: float = 0.0
func _init(outer_polygon: PackedVector2Array, inner_polygons: Array[PackedVector2Array], edge_safety: float):
self._outer_polygon = outer_polygon
self._edge_safety = edge_safety
# calulate boundary
var hole_boundary = Geometry2D.offset_polygon(outer_polygon, self._edge_safety)[0]
for ip in inner_polygons:
var new_hole = Geometry2D.intersect_polygons(hole_boundary, ip)[0]
self._inner_polygons.append(new_hole)
self.vectors.append_array(self._outer_polygon)
for inner_polygon in self._inner_polygons:
self.vectors.append_array(inner_polygon)
# returns all triangles generated by ear clipping the outer and inner polygons
func triangulate() -> PackedInt32Array:
static func triangulate(outer_polygon: PackedVector2Array, inner_polygons: Array[PackedVector2Array]) -> PackedInt32Array:
var triag = Triangulization.new()
return triag.triangulate_with_holes(self._outer_polygon, self._inner_polygons)
var result = triag.triangulate_with_holes(outer_polygon, inner_polygons)
return result

29
demo/scripts/test.gd
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@@ -1,29 +0,0 @@
extends Node
@onready var meshInstance = MeshInstance3D.new()
var lines = []
func _process(delta: float) -> void:
for l in lines:
DebugDraw3D.draw_lines(l, Color.DARK_RED)
meshInstance.rotate(Vector3.UP, (0.9 * delta))
meshInstance.rotate(Vector3.RIGHT, (0.9 * delta))
func _ready() -> void:
var p1 = [Vector2(4, 0), Vector2(4, 4), Vector2(0, 4), Vector2(0, 0)]
var p2 = [Vector2(0, 2), Vector2(0, 1), Vector2(2, 1), Vector2(2, 2)]
var p3 = [Vector2(2, 2), Vector2(2, 1), Vector2(4, 1), Vector2(4, 2)]
var trianglizationInstance = GeoPolyTriangulization.new(PackedVector2Array(p1), [PackedVector2Array(p2), PackedVector2Array(p3)], -0.001)
var vector_indexes = trianglizationInstance.triangulate()
var vectors_points = trianglizationInstance.vectors
var meshGenerator = GeoPolyMesh.new(vector_indexes, vectors_points)
var mesh = meshGenerator.commit_mesh()
meshInstance.mesh = mesh
add_child(meshInstance)

1
demo/scripts/test.gd.uid
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@@ -1 +0,0 @@
uid://dysaws7hlg4td