Improve beetle and net target visibility

tests/gathering_marker_surface_validation.gd

@@ -44,6 +44,8 @@ func _run() -> void:
 	assert(invalid_material.albedo_color == Color.WHITE)
 	assert(is_equal_approx(invalid_material.albedo_color.a, 1.0))
 	assert(is_equal_approx(valid_material.albedo_color.a, 1.0))
+	assert(invalid_material.no_depth_test)
+	assert(valid_material.no_depth_test)
 	assert(
 		invalid_material.shading_mode
 		== BaseMaterial3D.SHADING_MODE_UNSHADED

tests/generated_world_runtime_validation.gd

@@ -943,6 +943,10 @@ func _validate_prop_catalog(region: GeneratedWorldRegion) -> void:
 		assert(instance.position.is_zero_approx())
 		assert(_find_mesh_instance(instance) != null)
 		instance.free()
+		if definition.has_gatherable_surface():
+			assert(
+				definition.gatherable_surface_clearance >= 0.12
+			)
 	var mushroom := catalog.definition_for_id(&"prop_mushroom")
 	assert(mushroom != null and mushroom.has_collision())
 	assert(mushroom.visual_offset.y < 0.0)

tests/tree_gathering_prototype_validation.gd

@@ -41,7 +41,7 @@ func _validate_beetle_data() -> void:
 	assert(beetle.target_population_for_anchor_count(8) == 3)
 	assert(beetle.target_population_for_anchor_count(40) == 14)
 	assert(beetle.target_population_for_anchor_count(400) == 64)
-	assert(is_equal_approx(beetle.sprite_pixel_size, 0.005))
+	assert(is_equal_approx(beetle.sprite_pixel_size, 0.0075))
 	assert(beetle.is_stationary_spawn())
 	assert(not beetle.can_be_scared())
 
@@ -128,7 +128,7 @@ func _validate_anchored_presentation() -> void:
 	var sprite := presentation.get_node("GatherableSprite") as Sprite3D
 	assert(sprite != null)
 	assert(is_zero_approx(sprite.position.y))
-	assert(is_equal_approx(sprite.pixel_size, 0.005))
+	assert(is_equal_approx(sprite.pixel_size, 0.0075))
 	assert(not sprite.shaded)
 	assert(sprite.billboard == BaseMaterial3D.BILLBOARD_ENABLED)
 	assert(sprite.texture_filter == BaseMaterial3D.TEXTURE_FILTER_NEAREST)