Keep rain above generated tree canopies

tests/world_weather_validation.gd

@@ -524,6 +524,15 @@ func _validate_weather_presentation() -> void:
 	assert(rain.emitting)
 	assert(rain.amount_ratio > 0.99)
 	assert(rain.amount == WorldTimeVisualControllerType.RAIN_PARTICLE_AMOUNT)
+	assert(
+		WorldTimeVisualControllerType.RAIN_EMITTER_OFFSET.y
+		>= WorldTimeVisualControllerType.RAIN_SUPPORTED_CANOPY_HEIGHT
+		+ WorldTimeVisualControllerType.RAIN_CANOPY_CLEARANCE
+	)
+	assert(is_equal_approx(
+		rain.lifetime,
+		WorldTimeVisualControllerType.RAIN_LIFETIME_SECONDS,
+	))
 	assert(rain.visibility_aabb == (
 		WorldTimeVisualControllerType.RAIN_VISIBILITY_AABB
 	))
@@ -548,6 +557,9 @@ func _validate_weather_presentation() -> void:
 		rain_material.initial_velocity_max,
 		WorldTimeVisualControllerType.RAIN_VELOCITY_MAX,
 	))
+	assert(rain_material.gravity.is_equal_approx(
+		WorldTimeVisualControllerType.RAIN_GRAVITY
+	))
 	var rain_mesh := rain.draw_pass_1 as BoxMesh
 	assert(rain_mesh != null)
 	assert(rain_mesh.size.is_equal_approx(
@@ -569,6 +581,11 @@ func _validate_weather_presentation() -> void:
 	assert(rain_collision.size.is_equal_approx(
 		WorldTimeVisualControllerType.RAIN_COLLISION_SIZE
 	))
+	assert(
+		rain_collision.size.y * 0.5
+		> WorldTimeVisualControllerType.RAIN_EMITTER_OFFSET.y
+		+ WorldTimeVisualControllerType.RAIN_EMISSION_EXTENTS.y
+	)
 	assert(
 		rain_collision.heightfield_mask
 		== PrecipitationOcclusionType.RENDER_LAYER_MASK