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Why does the emission object behind a glass shader object loses its emission property, you can see it does not appear in the emit pass.

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Because emission pass contains only emissive rays hitting camera directly.

Glass (even transparent) is technically a surface blocking the ray and what you see in render is transmission.

So for emission behind a glass check Transmission > Indirect pass.

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  • $\begingroup$ great help thanks a lot $\endgroup$
    – MOMO
    Commented Jan 8 at 8:31
  • $\begingroup$ Great, it seems your Q is helpfull for others too :) $\endgroup$
    – vklidu
    Commented Jan 9 at 7:37

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