Relic/godot-demo-holes
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Modify Earcut and Triangulization Library to Work With Godot::Vector2

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Allows use to ease some pain when converting PackedVector2Array
to std::vector<Vector2>.
This commit is contained in:
Collin Campbell
2025-11-08 09:05:50 -05:00
parent 35a1706e58
commit 2d0408c09e
11 changed files with 34 additions and 77 deletions
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BIN
demo/bin/libgtriangulation.linux.template_debug.x86_64.so
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6
demo/main.tscn
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@@ -14,12 +14,6 @@ shadow_enabled = true
[node name="WorldEnvironment" type="WorldEnvironment" parent="."]
environment = SubResource("Environment_ig7tw")
[node name="Polygon2D" type="Polygon2D" parent="."]
[node name="Polygon2D2" type="Polygon2D" parent="."]
[node name="Polygon2D3" type="Polygon2D" parent="."]
[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)
current = true

14
demo/scripts/geometry/geopolymesh.gd
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@@ -14,20 +14,6 @@ var _v_points = []
var edges = {}
# returns debug lines to be drawn by callers DrawDebug3D
#var _debug_lines: Array[PackedVector3Array]:
#get:
#if !_debug_lines:
#for results in self._triangles:
#var triangle_lines: PackedVector3Array = []
#for vector_index in range(len(results)):
#var v1: Vector2 = results[vector_index]
#var v2: Vector2 = results[(vector_index+1) % CHUNK_RESULT]
#triangle_lines.append(Vector3(v1.x, v1.y, 0))
#triangle_lines.append(Vector3(v2.x, v2.y, 0))
#_debug_lines.push_back(triangle_lines)
#return _debug_lines
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")
surface_array.resize(Mesh.ARRAY_MAX)

24
demo/scripts/geometry/geopolytriangulization.gd
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@@ -8,35 +8,31 @@ class_name GeoPolyTriangulization
const CHUNK_RESULT: int = 3
# the boundary polygon
var _outer_polygon: Polygon2D
var _outer_polygon: PackedVector2Array
# inner polygons (holes)
var _inner_polygons: Array[Polygon2D]
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: Polygon2D, inner_polygons: Array[Polygon2D], edge_safety: float):
func _init(outer_polygon: PackedVector2Array, inner_polygons: Array[PackedVector2Array], edge_safety: float):
self._outer_polygon = outer_polygon
self._inner_polygons = inner_polygons
self._edge_safety = edge_safety
# create a polygon that will be used to intesect the hole and control where they can destoy the wall
var intersect_polygon = Polygon2D.new()
# calulate the new smaller polygon
intersect_polygon.polygon = Geometry2D.offset_polygon(outer_polygon.polygon, self._edge_safety)[0]
print(intersect_polygon.polygon)
# 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(intersect_polygon.polygon, ip.polygon)[0]
ip.polygon = new_hole
var new_hole = Geometry2D.intersect_polygons(hole_boundary, ip)[0]
self._inner_polygons.append(new_hole)
self.vectors.append_array(self._outer_polygon.polygon)
self.vectors.append_array(self._outer_polygon)
for inner_polygon in self._inner_polygons:
self.vectors.append_array(inner_polygon.polygon)
self.vectors.append_array(inner_polygon)
# returns all triangles generated by ear clipping the outer and inner polygons
func triangulate() -> PackedInt32Array:

23
demo/scripts/test.gd
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@@ -1,9 +1,5 @@
extends Node
@onready var p1 = $Polygon2D
@onready var p2 = $Polygon2D2
@onready var p3 = $Polygon2D3
@onready var meshInstance = MeshInstance3D.new()
var lines = []
@@ -16,22 +12,13 @@ func _process(delta: float) -> void:
meshInstance.rotate(Vector3.RIGHT, (0.9 * delta))
func _ready() -> void:
var p1_vectors = [Vector2(4, 0), Vector2(4, 4), Vector2(0, 4), Vector2(0, 0)]
var p2_vectors = [Vector2(0, 2), Vector2(0, 1), Vector2(2, 1), Vector2(2, 2)]
var p3_vectors = [Vector2(2, 2), Vector2(2, 1), Vector2(4, 1), Vector2(4, 2)]
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)]
p2_vectors.reverse()
p3_vectors.reverse()
p1.polygon = p1_vectors
p2.polygon = p2_vectors
p3.polygon = p3_vectors
p2.color = Color(1, 0, 1)
var trianglizationInstance = GeoPolyTriangulization.new(p1, [p2, p3], -0.001)
var trianglizationInstance = GeoPolyTriangulization.new(PackedVector2Array(p1), [PackedVector2Array(p2), PackedVector2Array(p3)], -0.001)
var vector_indexes = trianglizationInstance.triangulate()
print(vector_indexes)
var vectors_points = trianglizationInstance.vectors
var meshGenerator = GeoPolyMesh.new(vector_indexes, vectors_points)