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40 lines
1.3 KiB
GDScript
40 lines
1.3 KiB
GDScript
# Calculates an acceleration that repels the agent from its neighbors in the
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# given `GSAIProximity`.
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#
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# The acceleration is an average based on all neighbors, multiplied by a
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# strength decreasing by the inverse square law in relation to distance, and it
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# accumulates.
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# @category - Group behaviors
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class_name GSAISeparation
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extends GSAIGroupBehavior
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# The coefficient to calculate how fast the separation strength decays with distance.
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var decay_coefficient : float = 1.0
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var acceleration : GSAITargetAcceleration
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func _calculate_steering(_acceleration : GSAITargetAcceleration) -> void:
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acceleration.set_zero()
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self.acceleration = _acceleration
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# warning-ignore:return_value_discarded
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proximity.find_neighbors(_callback)
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# Callback for the proximity to call when finding neighbors. Determines the amount of
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# acceleration that `neighbor` imposes based on its distance from the owner agent.
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# @tags - virtual
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func _report_neighbor(neighbor : GSAISteeringAgent) -> bool:
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var to_agent : Vector3 = agent.position - neighbor.position
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var distance_squared : float = to_agent.length_squared()
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var acceleration_max : float = agent.linear_acceleration_max
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var strength := decay_coefficient / distance_squared
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if strength > acceleration_max:
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strength = acceleration_max
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acceleration.linear += to_agent * (strength / sqrt(distance_squared))
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return true
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