diff --git a/test/data/.gitkeep b/test/data/.gitkeep
new file mode 100644
index 0000000..e69de29
diff --git a/test/data/Cinzel-VariableFont_wght.ttf b/test/data/Cinzel-VariableFont_wght.ttf
new file mode 100644
index 0000000..38ae229
Binary files /dev/null and b/test/data/Cinzel-VariableFont_wght.ttf differ
diff --git a/test/data/pipes.glb b/test/data/pipes.glb
new file mode 100644
index 0000000..193988c
Binary files /dev/null and b/test/data/pipes.glb differ
diff --git a/test/main/plexus/core_test.clj b/test/main/plexus/core_test.clj
index 986d5d9..4996a89 100644
--- a/test/main/plexus/core_test.clj
+++ b/test/main/plexus/core_test.clj
@@ -4,13 +4,30 @@
    [clojure.test :as t]
    [plexus.core :as p]))
 
+(def default-eps 0.002)
+
 (defn get-volume [extrusion]
   (-> extrusion
       (p/get-model (:main-model extrusion))
       (m/get-properties)
       (:volume)))
 
-(def default-eps 0.002)
+(defn get-props [extrusion]
+  (-> extrusion
+      (p/get-model (:main-model extrusion))
+      (m/get-properties)
+      (update :volume double)
+      (update :surface-area double)))
+
+(defn about=
+  ([x y] (about= x y default-eps))
+  ([x y eps] (< (Math/abs (- x y)) eps)))
+
+(defn test-props [props extrusion]
+  (let [e-props (get-props extrusion)]
+    (doseq [[k x] e-props]
+      (let [y (get props k)]
+        (t/is (about= x y))))))
 
 (def pi Math/PI)
 (def pi|2 (/ pi 2))
@@ -23,10 +40,6 @@
     (/ (* n (pow s 2))
        (* 4 (Math/tan (/ pi n))))))
 
-(defn about=
-  ([x y] (about= x y default-eps))
-  ([x y eps] (< (Math/abs (- x y)) eps)))
-
 (t/deftest test-extrudes
   (t/is (about= (get-volume
                  (p/extrude
@@ -60,3 +73,52 @@
                   1 (p/right :angle pi|2)
                   2 (p/up :angle pi|2)
                   3 (p/down :angle pi|2))))))))))
+
+(t/deftest test-export
+  (let [extrusion (p/extrude
+                   (p/frame :cross-section (m/circle 6) :name :body)
+                   (p/forward :length 10))
+        vol (get-volume extrusion)]
+    (p/export extrusion "test/data/pipes.glb" (m/material :color [0 0.7 0.7 1.0] :metalness 0.2))
+    (t/is (= vol (:volume (m/get-properties (m/manifold (m/import-mesh "test/data/pipes.glb"))))))))
+
+(t/deftest test-hull
+  (let [m (p/extrude
+           (p/result :name :pipes
+                     :expr (p/difference :body :mask))
+
+           (p/frame :cross-section (m/circle 6) :name :body)
+           (p/frame :cross-section (m/circle 4) :name :mask)
+           (p/set :curve-radius 20)
+           (p/hull
+            (p/hull
+             (p/forward :length 20)
+             (p/set :cross-section (m/square 20 20 true) :to [:body])
+             (p/set :cross-section (m/square 16 16 true) :to [:mask])
+             (p/forward :length 20))
+            (p/set :cross-section (m/circle 6) :to [:body])
+            (p/set :cross-section (m/circle 4) :to [:mask])
+            (p/forward :length 20)))]
+    (test-props {:surface-area 7264.4707, :volume 7129.058} m)))
+
+(t/deftest test-orientation
+  (test-props
+   {:surface-area 191659.8125, :volume 143258.34375}
+   (p/extrude
+    (p/frame :name :body
+             :cross-section (-> (m/text "test/data/Cinzel-VariableFont_wght.ttf" "abc" 10 5 :non-zero)
+                                (m/scale-to-height 20)
+                                (m/center))
+             :curve-radius 50)
+    (for [i (range 4)]
+      (p/branch
+       :from :body
+       (case i
+         0 [(p/left :angle pi|2)
+            (p/right :angle pi|2)]
+         1 [(p/right :angle pi|2)
+            (p/left :angle pi|2)]
+         2 [(p/up :angle pi|2)
+            (p/down :angle pi|2)]
+         3 [(p/down :angle pi|2)
+            (p/up :angle pi|2)]))))))