39 lines
1.2 KiB
GDScript
39 lines
1.2 KiB
GDScript
extends KinematicBody
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class_name MovingPlatform
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var time_passed := 0.0
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var distance_to_pivot := 0.0
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export(float) var move_speed = 2.0
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export(NodePath) var solar_system
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func _process(delta):
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# Move the platform using the pivot and sin/cos.
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# Theoretically we could just use the gravity from the solar system and actually orbit, but
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# that seems like it'd get unstable very easily.
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if distance_to_pivot == 0.0:
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distance_to_pivot = get_parent().global_transform.origin.distance_to(global_transform.origin)
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time_passed += delta
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var speed_multiplier = (1.0 / distance_to_pivot) * move_speed
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translation = Vector3(0.0,
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cos(time_passed * speed_multiplier) * distance_to_pivot,
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sin(time_passed * speed_multiplier) * distance_to_pivot
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)
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# Rotate according to gravity
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var gravity_acceleration = get_node(solar_system).get_gravitation_acceleration(global_transform.origin)
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# Rotate down vector to face center of gravity
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var down = gravity_acceleration
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var local_down = transform.basis * Vector3.DOWN
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var angle = local_down.angle_to(down)
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var axis = local_down.cross(down).normalized()
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if axis != Vector3.ZERO: # Happens if we're perfectly aligned already (local_down and down are equal)
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rotate(axis, angle)
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