Time Trial Loop: Arcade Precision

[!NOTE] Resource Context: This module provides expert patterns for Time Trial Loops. Accessed via Godot Master.

Architectural Thinking: The "Validation-Chain" Pattern

A Master implementation treats Time Trials as a State-Validated Sequence. Recording a time is easy; ensuring the player didn't cheat via shortcuts requires a strictly ordered CheckpointManager.

Core Responsibilities

• TimeTrialManager: The central clock. Validates checkpoint order and handles "Best Lap" logic.
• GhostRecorder: Captures high-frequency transform data. Uses delta-time timestamps for frame-independent playback.
• Checkpoint: Spatial triggers that notify the Manager.

Expert Code Patterns

1. Robust Checkpoint Validation

Prevent "Shortcut Cheating" by requiring checkpoints to be cleared in numerical order.

# time_trial_manager.gd snippet
func pass_checkpoint(index):
    if index == current_checkpoint_index + 1:
        current_checkpoint_index = index
        _emit_split_time()

2. Space-Efficient Ghosting

Avoid recording every frame. Sample the player's position at a fixed rate (e.g., 10Hz) and use Linear Interpolation (lerp) during playback to fill the gaps.

# ghost_replayer.gd (Conceptual)
func _process(delta):
    # Uses linear interpolation for smooth 60fps+ playback from 10hz data
    var target_pos = frame_a.p.lerp(frame_b.p, weight)

Master Decision Matrix: Data Storage

Format	Best For	Implementation
Dictionary Array	Prototyping	Simple [{t: 0.1, p: pos}, ...]
Typed Array	Performance	PackedVector3Array for positions.
JSON/Binary	Saving	FileAccess.get_var() to save ghost files.

Veteran-Only Gotchas (Never List)

• NEVER use Time.get_ticks_msec() for physics-sensitive race logic. Use _process(delta) or _physics_process(delta) to stay in sync with the engine's time scale.
• NEVER use Area3D without monitoring optimization. Checkpoints should only look for the Player layer.
• NEVER record the whole object. Only record position and rotation. Input-state recording is better for determinism but harder to implement in Godot's physics.
• Juice: Ghost should be semi-transparent and have no collision to prevent distracting the player.

Registry

• Expert Component: time_trial_manager.gd
• Expert Component: ghost_recorder.gd
• Expert Component: ghost_replayer.gd