Can't see the material on one side of the model but I can on the other side

[mikoian]

Hi, I have a question...
I added a smart material to a model I have...which should show as solar panels.
But as you see in the image, from one angle I cannot see that added material...and if I rotate the model I can see it.
What is the problem? (I prepared the model in Cinema 4D)
I am new to Substance Painter.

[davescm]

Does your model have separate front and back surfaces with normals pointing outward in both cases? Any normals pointing in would show as your screenshot.

Dave

[mikoian]

It only has one surface but yes, the normals were point in the wrong direction so I went in and change them.