62 lines
2.0 KiB
GDScript
62 lines
2.0 KiB
GDScript
extends Node3D
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## NS-16: walkable ground ray pick. Emits world target for MoveCommand; camera wired from main.
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## NS-19: reject vertical faces (pedestal). Bump slopes ~39–45° (dot UP ~0.71–0.78).
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## 0.82 rejected slope-first picks when leaving plateau; use 0.64. Walls stay ~0.
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## (No `class_name` so headless/CI can load the project before `.godot` import exists.)
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signal target_chosen(world: Vector3)
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## Minimum `hit_normal.dot(Vector3.UP)` to accept a pick (0 = vertical wall, 1 = flat floor).
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const MIN_WALKABLE_NORMAL_DOT_UP: float = 0.64
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## Fallback when `Viewport.get_camera_3d()` is null (e.g. some editor setups). Set from `main.gd`
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## in `_ready`.
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var fallback_camera: Camera3D
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func _input(event: InputEvent) -> void:
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if event is InputEventMouseButton:
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var mb := event as InputEventMouseButton
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if mb.button_index == MOUSE_BUTTON_LEFT and mb.pressed:
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_try_pick(get_viewport().get_mouse_position())
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func _try_pick(screen_pos: Vector2) -> void:
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var cam: Camera3D = get_viewport().get_camera_3d()
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if cam == null:
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cam = fallback_camera
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if cam == null:
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return
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var origin: Vector3 = cam.project_ray_origin(screen_pos)
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var ray_dir: Vector3 = cam.project_ray_normal(screen_pos)
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var to: Vector3 = origin + ray_dir * 2000.0
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var query := PhysicsRayQueryParameters3D.create(origin, to)
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query.collision_mask = 1
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var space: PhysicsDirectSpaceState3D = get_world_3d().direct_space_state
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var hit: Dictionary = space.intersect_ray(query)
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if hit.is_empty():
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return
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var collider: Variant = hit.get("collider")
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if not _collider_is_walkable(collider):
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return
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var hit_normal: Variant = hit.get("normal", Vector3.ZERO)
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if hit_normal is not Vector3:
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return
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var nrm: Vector3 = (hit_normal as Vector3).normalized()
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if nrm.dot(Vector3.UP) < MIN_WALKABLE_NORMAL_DOT_UP:
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return
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var hit_pos: Variant = hit.get("position")
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if hit_pos is Vector3:
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target_chosen.emit(hit_pos as Vector3)
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func _collider_is_walkable(collider: Variant) -> bool:
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var n: Node = collider as Node
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while n:
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if n.is_in_group("walkable"):
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return true
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n = n.get_parent()
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return false
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