Improve tree gathering and rain occlusion

world/generation/generated_world_region.gd

@@ -12,6 +12,9 @@ const PlayerStorageInteractionType = preload(
 const MeshSurfaceAnchorSamplerType = preload(
 	"res://world/generation/mesh_surface_anchor_sampler.gd"
 )
+const PrecipitationOcclusionType = preload(
+	"res://world/environment/precipitation_occlusion.gd"
+)
 const WATER_BODY_SCENE: PackedScene = preload("res://world/water_body.tscn")
 const SALT_WATER_MATERIAL: Material = preload(
 	"res://world/materials/stylized_water.tres"
@@ -292,9 +295,21 @@ func _on_generation_completed(summary: Dictionary) -> void:
 	_place_spawn_amenities(spawn_position)
 	_configure_fresh_water(records)
 	_configure_diggable_area()
+	# Imported prop instances may finish applying their scene state while the
+	# generated world is assembled. Mark the final decoration tree once every
+	# prop and material variant is in place so rain canopy occlusion persists.
+	_mark_precipitation_occluders()
 	world_generated.emit(_current_seed, summary)
 
 
+func _mark_precipitation_occluders() -> void:
+	for prop: Node in _decorations.get_children():
+		var prop_group := prop.get_meta(&"terrain_prop_group", &"") as StringName
+		if prop_group not in [&"grass_tree", &"sand_tree"]:
+			continue
+		PrecipitationOcclusionType.mark_tree_meshes(prop)
+
+
 func _assign_biomes(
 	records: Array[Dictionary],
 	summary: Dictionary,

world/generation/props/definitions/prop_pine.tres

@@ -17,4 +17,3 @@ minimum_visual_scale = 0.65
 maximum_visual_scale = 1.2
 collision_radius = 0.5
 collision_height = 4.0
-gatherable_surface_material_names = PackedStringArray("wood")

world/generation/props/definitions/prop_pine_large.tres

@@ -17,4 +17,3 @@ minimum_visual_scale = 0.75
 maximum_visual_scale = 1.2
 collision_radius = 0.65
 collision_height = 9.5
-gatherable_surface_material_names = PackedStringArray("wood")