Render Viewport No shadow curve piping

shadows
render
curve
viewport
unhandled

#1

Hi,
I am testing Rhino 6 trial and I have a problem with display shadows on ground plane. In rendered viewport, there is no shadow on the ground projected by curve pipe until I not include some solid object that has to be accordingly big and positioned to this pipe.

Video card:
NVIDIA Corporation
Quadro K1000M/PCIe/SSE2
OpenGL version: 4.5.0 NVIDIA 354.42
Render version: 4.5
Shading Language: 4.50 NVIDIA
Driver Date: 10-27-2015
Driver Version: 10.18.13.5442

Maximum Texture size: 16384 x 16384
Z-Buffer depth: 24bits
Stencil depth: 8bits
Maximum Viewport size: 16384 x 16384
Total Video Memory: 2 GB