Emissive Material not Rendered at Some Angles This is a night scene I modeled with some windows in the building.
Normally all the windows should be lit. But the light does not pass through the window if the camera is not perpendicular to the it.


What should I do to let the light pass at any angles?




By the way, I am using Blender 2.91
@Allen Simpson' s answer inspired me. Now I found the solution by simply setting the IOR value of the window glass to 1.0 or slightly larger (1.45 is the default setting).
Here is the result.