Problem with glassing , black spots

1

Hello,

I have problems with the glass material, when I bake half of the glasses are dark or completelly black, as if they were two different materials, but they are made in one single piece.

what could be a possible problem or way to solve it?

thank you

1
11280×707 139 KB

2

Could you examine the geometry of the windows in the 3D tool? The two potential issues that comes to my mind are:

  1. Perhaps there are some redundant polygons oriented towards the building exterior?
  2. Normals of the windowpane might be broken. Perhaps the windowpanes objects are using smoothing, whereas they should use hard edges between the polygons?
3

thank you, the solution was applying turbosmooth inside 3dsmax