/godot-version-migration

Migration notes: godot-genre-tower-defense

Incremental upgrade for topics this skill covers. Apply one hop, stabilize/test, then next. Never skip hops.

If the project is < 4.0, follow godot-version-migration era bridges (legacy → 3→4) until 4.0, then these hops. Official 3→4: Upgrading from Godot 3 to Godot 4.

4.0 → 4.1

Official: Upgrading to Godot 4.1

• NavigationAgent2D/3D.set_velocity → velocity property.
• time_horizon split into time_horizon_agents and time_horizon_obstacles.
• NavigationAgent3D.agent_height_offset → path_height_offset; ignore_y removed.
• NavigationObstacle*.estimate_radius removed; get_rid → get_agent_rid.
• NavigationServer*.agent_set_callback → agent_set_avoidance_callback; target velocity / time_horizon server APIs split/removed.

4.1 → 4.2

Official: Upgrading to Godot 4.2

• TileMap.cell_quadrant_size → rendering_quadrant_size.

4.2 → 4.3

Official: Upgrading to Godot 4.3

• If the genre uses TileMap, migrate to TileMapLayer nodes before relying on layer APIs.
• If the genre ships multiplayer, upgrade all peers to 4.3 together (SceneMultiplayer protocol).
• AStar2D/3D/Grid2D.get_*_path gain allow_partial_path.
• NavigationRegion2D experimental avoidance props (avoidance_layers, constrain_avoidance, …) removed with no replacement.
• TileMap layers moved to TileMapLayer nodes — migrate scenes/scripts to per-layer nodes.
• TileData.get_navigation_polygon / get_occluder gain flip/transpose optionals.

4.3 → 4.4

Official: Upgrading to Godot 4.4

• NavigationServer2D/3D.query_path gains optional callback.

4.4 → 4.5

Official: Upgrading to Godot 4.5

• Nav regions update asynchronously by default (navigation/world/region_use_async_iterations) — expect sync delay.
• Navmesh merge order changed; edge merge errors may surface — tune merge_rasterizer_cell_scale / fix overlapping navmeshes.
• TileMapLayer.get_coords_for_body_rid less precise with physics chunking — set physics_quadrant_size = 1 for old precision.

4.5 → 4.6

Official: Upgrading to Godot 4.6

• Retune Environment glow/fog if the genre leans on bloom-heavy looks.
• AStar*.get_point_path / get_id_path return empty path when from_id is disabled/solid.

4.6 → 4.7

Official: Upgrading to Godot 4.7

• Confirm project stretch mode and AudioStreamPlayer area_mask after opening in 4.7.