132 lines
4.1 KiB
GDScript
132 lines
4.1 KiB
GDScript
extends Node3D
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## NEON-25: client-local isometric follow; updates [CameraState] each `_process`.
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## Pitch / roll are fixed by presentation exports; **orbit yaw** in state stays **0** while
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## [member allow_yaw] is false (no rotate input bound). Future orbit: read relative input here,
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## add to `_orbit_yaw_rad`, clamp with [member max_yaw_deg].
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const CameraStateScript := preload("res://scripts/camera_state.gd")
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## Tuned to match pre-NEON-25 static `Camera3D` at (12,10,12) vs player at (-5,0.9,-5).
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@export var follow_target_path: NodePath = NodePath("../Player")
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@export var follow_distance: float = 25.709
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@export var pitch_elevation_deg: float = 20.693
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@export var presentation_yaw_deg: float = 45.0
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@export var focus_vertical_offset: float = 0.0
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@export var allow_yaw: bool = false
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@export var max_yaw_deg: float = 45.0
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## Higher = snappier follow (`1 - exp(-smoothness * delta)`).
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@export var follow_smoothness: float = 12.0
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## When eye-to-desired distance exceeds this, snap (server snap / huge teleports).
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@export var snap_distance: float = 24.0
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## Latest [CameraState] tick; same object each frame (see NEON-25 plan).
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var camera_state:
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get:
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return _state
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var _state = null
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var _smoothed_eye: Vector3 = Vector3.ZERO
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var _orbit_yaw_rad: float = 0.0
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var _warned_missing_follow_target: bool = false
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@onready var camera: Camera3D = $Camera3D
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func _ready() -> void:
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_state = CameraStateScript.new()
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if camera == null:
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push_error("IsometricFollowCamera: expected child Camera3D")
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return
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var t: Node3D = _resolve_target()
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if t != null:
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if not allow_yaw:
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_orbit_yaw_rad = 0.0
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else:
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_orbit_yaw_rad = clampf(
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_orbit_yaw_rad, -deg_to_rad(max_yaw_deg), deg_to_rad(max_yaw_deg)
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)
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var focus0: Vector3 = t.global_position + Vector3(0.0, focus_vertical_offset, 0.0)
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var yaw0: float = deg_to_rad(presentation_yaw_deg) + _orbit_yaw_rad
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_smoothed_eye = desired_eye_world(
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focus0, follow_distance, deg_to_rad(pitch_elevation_deg), yaw0
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)
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global_position = _smoothed_eye
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camera.look_at(focus0, Vector3.UP)
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_sync_camera_state(focus0)
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else:
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_smoothed_eye = global_position
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_warn_missing_follow_target_once()
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func _process(delta: float) -> void:
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if camera == null or _state == null:
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return
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var target: Node3D = _resolve_target()
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if target == null:
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# No eye/state update until the path resolves — avoids chasing a freed or miswired node.
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_warn_missing_follow_target_once()
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return
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_warned_missing_follow_target = false
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if not allow_yaw:
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_orbit_yaw_rad = 0.0
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else:
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_orbit_yaw_rad = clampf(_orbit_yaw_rad, -deg_to_rad(max_yaw_deg), deg_to_rad(max_yaw_deg))
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var focus: Vector3 = target.global_position + Vector3(0.0, focus_vertical_offset, 0.0)
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var yaw_total: float = deg_to_rad(presentation_yaw_deg) + _orbit_yaw_rad
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var desired: Vector3 = desired_eye_world(
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focus, follow_distance, deg_to_rad(pitch_elevation_deg), yaw_total
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)
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if _smoothed_eye.distance_to(desired) >= snap_distance:
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_smoothed_eye = desired
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else:
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var k: float = 1.0 - exp(-follow_smoothness * delta)
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_smoothed_eye = _smoothed_eye.lerp(desired, k)
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global_position = _smoothed_eye
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camera.look_at(focus, Vector3.UP)
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_sync_camera_state(focus)
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func _sync_camera_state(focus: Vector3) -> void:
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# `CameraState.yaw` = orbit delta only; world-fixed diagonal framing =
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# `presentation_yaw_deg`.
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_state.follow_target_path = follow_target_path
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_state.distance = follow_distance
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_state.zoom_band_index = 0
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_state.focus_world = focus
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_state.yaw = _orbit_yaw_rad
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func _resolve_target() -> Node3D:
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if follow_target_path.is_empty():
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return null
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var n: Node = get_node_or_null(follow_target_path)
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if n is Node3D:
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return n as Node3D
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return null
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func _warn_missing_follow_target_once() -> void:
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if _warned_missing_follow_target:
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return
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_warned_missing_follow_target = true
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push_warning(
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(
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"IsometricFollowCamera: follow_target_path is empty or does not resolve to a Node3D; "
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+ "camera not updating."
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)
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)
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static func desired_eye_world(
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focus: Vector3, distance: float, pitch_elevation_rad: float, yaw_rad: float
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) -> Vector3:
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var h: float = distance * cos(pitch_elevation_rad)
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return focus + Vector3(h * sin(yaw_rad), distance * sin(pitch_elevation_rad), h * cos(yaw_rad))
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