49 lines
1.8 KiB
GDScript
49 lines
1.8 KiB
GDScript
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class_name StairGuard
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extends RefCounted
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# One continuous sloping prism replaces the stepped collision faces of a guard.
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static func build(parent: Node3D, x: float, first_z: float, direction: float, bottom: float, rise: float, batch: UrbanMeshBatch = null) -> void:
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var body := parent as StaticBody3D
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if body == null: body = StaticBody3D.new()
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if body != parent: body.name = "SmoothStairGuard"
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body.collision_layer = 1
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body.collision_mask = 0
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var points := PackedVector3Array()
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for end in [0.0, 1.0]:
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var z: float = first_z + direction * (-0.2 + end * 7.6)
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var y: float = bottom + rise / 38.0 + end * rise
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for side in [-0.06, 0.06]:
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for height in [0.0, 0.96]: points.append(Vector3(x + side, y + height, z))
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var shape := ConvexPolygonShape3D.new()
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shape.points = points
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var collider := CollisionShape3D.new()
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collider.shape = shape
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body.add_child(collider)
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if body != parent: parent.add_child(body)
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if batch:
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batch.mesh(surface(points), Vector3.ZERO, "metal", Color("343b3d"))
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static func surface(points: PackedVector3Array) -> ArrayMesh:
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# Use the collision prism's exact corners: the visible top is equally smooth.
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var tool := SurfaceTool.new()
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tool.begin(Mesh.PRIMITIVE_TRIANGLES)
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var center := Vector3.ZERO
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for point in points: center += point / 8.0
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for face in [[0,2,3,1], [4,5,7,6], [0,1,5,4], [2,6,7,3], [1,3,7,5], [0,4,6,2]]:
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for triangle in [[face[0],face[1],face[2]], [face[0],face[2],face[3]]]:
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var a: Vector3 = points[triangle[0]]
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var b: Vector3 = points[triangle[1]]
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var c: Vector3 = points[triangle[2]]
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var normal := (c-a).cross(b-a).normalized()
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if normal.dot((a+b+c)/3.0-center) < 0:
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var swap := b
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b = c
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c = swap
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normal = -normal
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for vertex in [a,b,c]:
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tool.set_normal(normal)
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tool.set_uv(Vector2(vertex.z,vertex.y))
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tool.add_vertex(vertex)
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return tool.commit()
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