the transparency on alpha channel

[Arzillo]

Hi everyone, how do you put transparency in the alpha channel of the glass? In practice, the alpha channel of the glass should not be a precise contour of the glass, but should allow you to see the transparency to be used in post production

[maru]

Hi, you should use "mask propagation" for this:
https://support.chaos.com/hc/en-us/articles/4528490184977-How-to-use-Masks-with-Reflection-Refraction-in-Cinema-4D

[Arzillo]

thanks a lot