Unify fishing surfaces and presentation

fishing/fishing_surface_sample.gd

@@ -0,0 +1,28 @@
+class_name FishingSurfaceSample
+extends RefCounted
+
+const FishableWaterRegionType = preload(
+	"res://world/fishable_water_region.gd"
+)
+
+var has_surface: bool = false
+var position: Vector3 = Vector3.ZERO
+var normal: Vector3 = Vector3.UP
+var water_region: FishableWaterRegionType
+var is_water_surface: bool = false
+
+
+func is_fishable() -> bool:
+	return is_water_surface and water_region != null and water_region.fish_pool != null
+
+
+func get_marker_position(vertical_offset: float) -> Vector3:
+	if not has_surface:
+		return position
+	return position + normal.normalized() * vertical_offset
+
+
+func get_bobber_position(solid_clearance: float) -> Vector3:
+	if not has_surface or is_water_surface:
+		return position
+	return position + normal.normalized() * solid_clearance