Hi,
My first guess would be that you have an unmatched ‘solid glass’ face in some of the window panes. To the ray tracer, this would mean that you effectively have a giant block of glass extending from the window to the building in the distance, creating strong refraction effects. If the window panes were tilted slightly from the vertical, that would produce a ‘leaning’ effect, and if some were tilted more than others, the tilts would add up to produce a curve.
The solid glass material type is for use when you have modelled window panes with their actual thickness – a face for each side, separated by a few millimetres. When a ray hits the first face, it is bent due to refraction, but is then almost immediately bent back the other way when it encounters the next face and exits the glass. When modelling this way, it’s important to apply the same glass material to both sides of both faces so that rays behave consistently no matter which direction they are travelling.
If you don’t need to accurately render the subtle refraction produced by a pane of glass, you can use a single face and apply the ‘thin glass’ material type, which ignores the refraction effect.
If the above doesn’t help, feel free to send your model (or a file-sharing link to it) to us at and we will be able to investigate it more thoroughly.
Regards,
Shaderlight support
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