Hello,
I just want to confirm what Christophe Fortineau said.
It is indeed a known issue with the 3D Engine of the BIMx app that it can't handle transparency 100% properly when there are multiple (semi-)transparent surfaces behind each other, making foliage disappear.
This is one of the issues the new 3D engine of BIMx Lab is set out to fix. It is currently only available for iOS, but we are planning to roll it out for other platforms as well in the future (once the development finishes). In the meantime, if you are on iOS, I recommend using BIMx Lab, because that should give you a much better experience.
Regards,
Daniel Alexander Kovacs
Professional Services Consultant
GRAPHISOFT
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