diff --git a/src/flitter/render/window/models.pxd b/src/flitter/render/window/models.pxd
index ef97edcc..7d685e2f 100644
--- a/src/flitter/render/window/models.pxd
+++ b/src/flitter/render/window/models.pxd
@@ -9,6 +9,8 @@ cdef double DefaultSnapAngle
 cdef int64_t DefaultSegments
 
 
+cpdef tuple build_arrays_from_trimesh(trimesh_model)
+cpdef tuple build_arrays_from_manifold(manifold)
 cpdef void fill_in_normals(vertices_array, faces_array)
 
 
diff --git a/src/flitter/render/window/models.pyx b/src/flitter/render/window/models.pyx
index 341f0481..09bbe9a7 100644
--- a/src/flitter/render/window/models.pyx
+++ b/src/flitter/render/window/models.pyx
@@ -45,7 +45,7 @@ cdef uint64_t SDF = HASH_UPDATE(HASH_START, HASH_STRING('sdf'))
 cdef uint64_t MIX = HASH_UPDATE(HASH_START, HASH_STRING('mix'))
 
 
-cdef tuple build_arrays_from_trimesh(trimesh_model):
+cpdef tuple build_arrays_from_trimesh(trimesh_model):
     if trimesh_model is None:
         return None
     vertex_data = np.zeros((len(trimesh_model.vertices), 8), dtype='f4')