89 lines
1.9 KiB
GDScript3
89 lines
1.9 KiB
GDScript3
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@tool
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extends Node3D
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@onready var mesh: MeshInstance3D = $Line
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@onready var plane: MeshInstance3D = $Plane
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@onready var x_axis: Sprite3D = $XAxis
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const RADIUS = 0.005
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const STEPS = 5
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@export var size: Vector2 = Vector2(0.5, 0.3)
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var points = R.state([])
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var minmax = R.computed(func(_arg):
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if points.value.size() == 0:
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return [Vector2(0, 0), Vector2(0, 0)]
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var min=points.value[0]
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var max=points.value[0]
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for point in points.value:
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min.x=min(min.x, point.x)
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min.y=min(min.y, point.y)
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max.x=max(max.x, point.x)
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max.y=max(max.y, point.y)
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return [min, max]
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)
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var relative_points = R.computed(func(_arg):
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var min=minmax.value[0]
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var max=minmax.value[1]
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return points.value.map(func(point):
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return Vector2(inverse_lerp(min.x, max.x, point.x), inverse_lerp(min.y, max.y, point.y))
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)
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)
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func _ready():
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for i in range(100):
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points.value.append(Vector2(i, sin(i / 10.0)))
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R.effect(func(_arg):
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mesh.mesh=generate_mesh(relative_points.value)
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)
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plane.position = Vector3(size.x / 2, size.y / 2, -0.001)
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plane.mesh.size = size
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func generate_mesh(points: Array):
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if points.size() < 2:
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return null
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var sf = SurfaceTool.new()
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sf.begin(Mesh.PRIMITIVE_TRIANGLE_STRIP)
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for i in range(points.size() - 1):
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var point = points[i]
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var next_point = points[i + 1]
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var angle = (next_point - point).angle_to(Vector2(1, 0))
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var up = Vector2(0, 1).rotated( - angle)
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var p0 = point + up * RADIUS * 2
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var p1 = point + up * - RADIUS * 2
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sf.add_vertex(Vector3(p0.x * size.x, p0.y * size.y, 0))
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sf.add_vertex(Vector3(p1.x * size.x, p1.y * size.y, 0))
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sf.index()
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sf.generate_normals()
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var _mesh = sf.commit()
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sf.clear()
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sf.begin(Mesh.PRIMITIVE_TRIANGLE_STRIP)
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for i in range(points.size() - 1):
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var point = points[i]
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sf.add_vertex(Vector3(point.x * size.x, point.y * size.y, RADIUS))
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sf.add_vertex(Vector3(point.x * size.x, point.y * size.y, -RADIUS))
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return sf.commit(_mesh)
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