Sorry, I'm not sure what could be the problem, but have you checked the portal lights documentation?
https://docs.otoy.com/StandaloneH_STA/S ... ortals.htm
In short: To set up a scene using Portal Materials it is important to make sure that every window or opening in the environment is covered by a portal plane. It will not work if only one window has a portal over it when all other windows do not have a portal over them. And the normal direction of the portal plane should be facing inwards towards the interior or the scene will not render properly. Portal planes should not be blocked by other geometry such as a glass surface. Objects with the Portal material applied will not be visible in the rendering as geometry.
Also, be aware that the Portal Material option should be used with the Pathtracing and PMC kernels, it will not work when rendering with the Direct Light kernel.
Hope it helps,
roeland wrote:You can have glass but it must have the fake shadow option enabled.
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