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the light source is hdri and light portal in the windows. i use camera transparency setting and glass transparency. but some of the windows glass behave like a mirror.

  • $\begingroup$ Well, that's how glass works... If you want transparency without reflection, you can use a Transparent BSDF shader. $\endgroup$ – thibsert Dec 19 '19 at 13:33
  • $\begingroup$ Hello and welcome :). Real glass will actually act as a mirror under a shallow viewing angle. In your case, it doesn't look too realistic so there might be other issues. You can share your file, so others can take a look. $\endgroup$ – Jachym Michal Dec 19 '19 at 13:34
  • $\begingroup$ Try adding a glass with a transparency mix shader, and set the IOR to a low level. $\endgroup$ – Nate_Sycro27 Dec 19 '19 at 14:16

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