Serengeti [bug]: Transparency in materials doesn't work

Below is a double-sided material in Rhino8 and in Rhino9. It’s the same material. In Rhino9, the transparency isn’t working. The cool thing about double-side transparent materials is you can see IN but not THROUGH the object, which is exactly the effect I was going for. It works in Rhino7 and Rhino8, but not Rhino9.

The actual RMTL file is attached.


Gem - Stylized - Sapphire.rmtl (20.2 KB)

system_info_r9.txt (2.9 KB)

I imagine this has to do with the new colored transparency for Rendered display mode added by @DavidEranen

Thanks for reporting. I made a YT item: https://mcneel.myjetbrains.com/youtrack/issue/RH-87448/Display-Double-sided-transparent-material-is-not-transparent.

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