TySpline won't render in VRay GPU's interactive rendering or Arnold

[onyxlee]

Hi guys, newbie here asking for help!

I have a tyspline object which renders well in VRay GPU production mode, but not in the interactive mode. This is already a mesh object, so it doesn't need a trimesh node, right? I think maybe this is something in VRay's setting. Any tips?

I also can't render tyspline in Arnold as well, CPU/GPU/interactive or whatever.

Thanks a lot!