Hi Napon!
The sliding windows from the windows project have small holes in the frame.
This creates shadows when rendering 3D Floor Plans.
Please look at attached document for more information!
Try to fix this window:
Please use Mr. Tees files, but do not export your fixed model with the same key as his.
After opening his max-file, save it to your computer and export as a new item.
Good luck with this. I believe you 3D-profs will fix it J
Please don't hesitate to ask if anything is unclear, and please use the windows manual for further information!
Best regards
Elin