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https://github.com/jcreek/CosmicClash.git
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Josh Creek
31 lines
881 B
GDScript
31 lines
881 B
GDScript
extends RewardFunction2D
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class_name ApproachNodeReward2D
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## Calculates the reward for approaching node
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## a reward is only added when the agent reaches a new
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## best distance to the target object.
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## Best distance reward will be calculated for this object
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@export var target_node: Node2D
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## Scales the reward, 1.0 means the reward is equal to
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## how much closer the agent is than the previous best.
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@export_range(0.0, 1.0, 0.0001, "or_greater") var reward_scale: float = 1.0
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var _best_distance
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func get_reward() -> float:
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var reward := 0.0
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var current_distance := global_position.distance_to(target_node.global_position)
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if not _best_distance:
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_best_distance = current_distance
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if current_distance < _best_distance:
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reward = (_best_distance - current_distance) * reward_scale
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_best_distance = current_distance
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return reward
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func reset():
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_best_distance = null
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