Rijad Zuzo
52 lines
1.5 KiB
GDScript
52 lines
1.5 KiB
GDScript
extends Node
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const SHADER_INTERACTOR_LIMIT := 8
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@export var grass_material: ShaderMaterial
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@export_range(1, SHADER_INTERACTOR_LIMIT, 1) var max_interactors := 8
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@export_range(0.02, 0.5, 0.01) var update_interval := 0.08
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var _elapsed := 0.0
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func _ready() -> void:
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_refresh_interactors()
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func _process(delta: float) -> void:
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_elapsed += delta
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if _elapsed < update_interval:
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return
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_elapsed = 0.0
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_refresh_interactors()
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func _refresh_interactors() -> void:
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if grass_material == null:
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return
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var camera := get_viewport().get_camera_3d()
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var origin := camera.global_position if camera != null else Vector3.ZERO
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var nearest: Array[Node3D] = []
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for value in get_tree().get_nodes_in_group("grass_interactors"):
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var candidate := value as Node3D
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if candidate == null:
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continue
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var insert_at := nearest.size()
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var candidate_distance := origin.distance_squared_to(candidate.global_position)
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for index in nearest.size():
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if candidate_distance < origin.distance_squared_to(nearest[index].global_position):
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insert_at = index
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break
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nearest.insert(insert_at, candidate)
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if nearest.size() > max_interactors:
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nearest.pop_back()
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var positions := PackedVector3Array()
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positions.resize(SHADER_INTERACTOR_LIMIT)
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for index in SHADER_INTERACTOR_LIMIT:
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positions[index] = Vector3(0.0, -1000.0, 0.0)
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for index in nearest.size():
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positions[index] = nearest[index].global_position
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grass_material.set_shader_parameter("interactor_count", nearest.size())
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grass_material.set_shader_parameter("interactor_positions", positions)
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