I have a big mesh and a NodeMaterial to show many trees in the scene, but the transparency rendering is not right. What can I do ?
Hello 
Since your trees appear transparent on my side, I guess your problem is about depth sorting (The fact that a tree from background appears on top of a tree from foreground), right ?
Transparent rendering is a complex subject (have a look at the doc here), and it can be even trickier when it comes to rendering transparent self-overlapping mesh (which is the case here)
There are several ways, but in your case (many trees), I would advice to separate them into instances, instead of rendering one big mesh
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You could also not use transparency (by not connecting anything to the FragmentOutput.a input) and use a Discard block instead:
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Thank you. Using instances is good idea.
Great job!