Ternary branching follows the same logic as monopodial and sympodial

pictures are from p60 61 of the book the algorithmic beauty of plants"

in addition to above, let us add a tropism

https://en.wikipedia.org/wiki/Tropism

the tropism follows this logic, it is e perturbation to rotate the turtle a little

in term of modeling is Xgen, it becomes as below. long time since I did not use a cross-product....

it was not clear in the book, where to add this code. I decided to put it just after any "yell" or "pitch" -> 3 places in the model.

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the result is as below with Tropism vector of (0.77,-0.61,-0.19)

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the result is as below with Tropism vector of (0,0,1)

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xGenerative Design ​​​​​​​