Ik created a building, but in 3D it doesn't show the right color on the floor. It all stays white or gray. floorborders are shown correct but the floor isn't.

Proc: Intel(R) Core(TM) i7-6700K CPU @ 4.00GHz 4.00 GHz
Mem: 16,0 GB
OS: Windows 10 Pro 64
NVIDIA GTX 1060