+(define-public (ai-transform-vec-by-matrix4 vec mat)
+ (let ((cvec (parse-aiVector3D (map cdr (ai-vector3d-contents vec)) #:reverse #t))
+ (cmat (parse-aiMatrix4x4 (map cdr (ai-matrix4x4-contents mat)) #:reverse #t)))
+ (aiTransformVecByMatrix4 cvec cmat)
+ (wrap-ai-vector3d cvec)))
+