I've been messing around with ONYX to make my trees for my Spirited Away scene but just got frustrated with how they were turning out. I think this is because I was just exporting the default trees and plopping them in. So I decided to make a tree library scene that had real-world accurate trees (to an extent).
For example, I wanted to use the Platanus tree from the ONYX preset library.
I took a quick google and found some good references of the kind of Platanus tree I wanted since there are a variety of types.
Characteristics- really tall tree (Wiki says 30-50 metres), with pretty huge leaves too (look at them compared to the car). A somewhat uniform branch length starting fairly low on the trunk.
Here is the default preset Platanus tree... wow doesn't look much of anything like the refs.
After tweaking the branch and bough lengths, convexity, leaf density and scale, and B3 density I ended up with this. Not really that many parameters had to be changed!
My last thing to decide was whether to have it sky sensitive or not. This is a parameter under Phyllotaxy on the Leaf submenu. Sky sensitive means that the leaves are oriented to face the sun, a characteristic many plants have. Looking at some of the references I couldn't really determine if they were or not, so I left it up to which look I liked better.
Example of sky sensitive tree (Acer saccharum):
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