WIP: cylinder and ball tests

needs tg-jschakib to run and (maybe) pass ci.

tests/geometry/functions/area.cc

@@ -86,4 +86,16 @@ TG_FUZZ_TEST(TypedGeometry, Area)
 
         CHECK(triangleArea == doctest::Approx(area(triangle)).epsilon(1e-5));
     }
+
+    {
+        // surface area
+        auto c = tg::cylinder3(tg::pos3::zero, 1, 1, tg::dir3::pos_y);
+
+        CHECK(area(c) == doctest::Approx(4 * tg::pi<tg::f32>.radians()).epsilon(1e-5));
+    }
+
+    {
+        auto pyra = tg::pyramid3(tg::pos3::zero, 2, 4);
+        CHECK(area(pyra) == doctest::Approx(20.49242));
+    }
 }