26 lines
832 B
GDScript3
26 lines
832 B
GDScript3
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class_name WeatherParticles extends GPUParticles3D
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## Particle system that follows the camera.
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## How far directly in front of the camera to remain regardless of velocity.
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@export var front_flat_distance: float = 1.0
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## How many seconds ahead of the camera to remain when it moves.
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@export var seconds_ahead: float = 4.0
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## Last known position of the camera, for tracking velocity.
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var _last_camera_posn := Vector3.ZERO
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func _process(delta: float) -> void:
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var camera := get_viewport().get_camera_3d()
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if camera:
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# Track camera velocity.
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var camera_velocity := (
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camera.global_position - _last_camera_posn
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)/delta
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_last_camera_posn = camera.global_position
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# Reposition particle system.
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global_position = (
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camera.global_position +
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camera.basis.z*front_flat_distance +
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camera_velocity*seconds_ahead
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)
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