intersection tests for box and plane

typed-geometry @ b26a52a4

-Subproject commit 71aeccbb4212dc12be6b1ff4eb14827d0a53feba
+Subproject commit b26a52a4e77285201be41172b75839938efcf48b

tests/feature/intersections/plane-intersect.cc

@@ -330,6 +330,8 @@ TG_FUZZ_TEST(Plane, Intersect)
 
     // plane3 - box3
     {
+        auto const origins = tg::aabb3(tg::pos3(-10), tg::pos3(10));
+
         auto half_extents = tg::mat3();
         half_extents[0] = tg::dir3::pos_x;
         half_extents[1] = tg::dir3::pos_y;
@@ -360,8 +362,15 @@ TG_FUZZ_TEST(Plane, Intersect)
         half_extents[1] = ny * uniform(rng, 1.0f, 10.0f);
         half_extents[2] = nz * uniform(rng, 1.0f, 10.0f);
 
-        auto const box
+        box = tg::box3(uniform(rng, origins), half_extents);
 
-        auto const plane = tg::plane3(tg::uniform<tg::dir3>(rng), tg::pos3::zero)
+        {
+            auto const plane = tg::plane3(nx, tg::pos3(box.center + half_extents[0] * 1.1f));
+            CHECK(!intersects(plane, box));
+        }
+        {
+            auto const plane = tg::plane3(nx, tg::pos3(box.center + half_extents[0] * 0.9f));
+            CHECK(intersects(plane, box));
+        }
     }
 }