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Creating 3D trees in City Engine?

AnnaRoyar

Hello!
I was wondering if anyone could give me some hints about how to make those neat 3D trees that people have in their city engine models? I have tree points with Z values. I have looked online and through the help and don't see anything about how to make those into trees.
Any advice?
Thanks so much!

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Accepted answers

MatthiasBuehler1

hi !

use center()

first, usually, do the s(), then center(), then i(). use t() after the i() to fix any issues left.

notes:
1]
s(0,0,0) uses the asset's original size.
s(0,treeHeight,0) will scale your asset proportinally to the given size
2]
after scatter(), use alignScopeToAxes(y) to align the scope vertically, to make the tree stand vertically.

ok?

All comments

gulhunduran

Yeah it's OK! 🙂

MatthiasBuehler1

gulhunduran

Hi,
I'm trying to create a natural greenspace code with LOD options. Low LOD option works but High LOD creates trees far away from the original shape. Can anyone help me find what is wrong with my code. Thanks in advance!

[PHP]@Range ("high", "low")
attr LOD = "high"

@StartRule
Lot--> Forest
Green

Forest-->
scatter(surface, 200, gaussian, left, '0.5) { Tree }

treetex_high =fileRandom("tree_eu/*.obj")
treetex_low = fileRandom("alleyTree/alleyTree_*_v1.obj")

Tree-->
case LOD == "high" :
i(treetex_high)
t(0,0.2,0)
s(5,rand (5, 15),5)
else:
i(treetex_low)
t(0,0.2,0)
s(10,rand (15, 25),8)
color("#86ad6f")
Green-->
set(material.opacity, 0.5)
t(0,0.2,0)
color (0,1,0)
[/PHP]

MatthiasBuehler1

working on it ..

amamalalalalal

Hi,

wonderful, you are a master. it is a code very useful for generating trees from shape data.
Is there a listing of cga rule file? it will be interesting to create a topic with all the cga rule file which works.

Thanks for the code. 😉

MatthiasBuehler1

hi ..

written from my head .. please test the code, it may contain errors.


attr HEIGHT = 0 # connect to GIS attr
Range( "palm", "pine", "eucalyptus" )
attr TREETYPE = "palm"

getAssetPath =
    fileRandom ( "assets/trees/" + TREETYPE + "/*.obj" )

@StartRule
TREE -->
    alignScopeToAxes(y)
    s(0,HEIGHT,0)
    i(getAssetPath)
    center(xz)
    Tree.

amamalalalalal

Hi,

I have tested this code, it perfectly works but i want to do the same operation with an attribute :

I have a shape called "TREE" and an attribute called "HEIGHT". How can i generate tree of different height with the attribute of the tree?
Next, how can i adapt this code to link different representation like pine, palm with obj?

tree_tex = fileRandom("assets/trees/alleyTree_*_v1.obj")

LotTree--> s(0,rand(8,12),0) center(xz) i(tree_tex) Tree.

🙂

Thank you very much,

aurelien

JoanneO_Brien

You just need to insert an obj tree at the point. You can use the obj's supplied by CE or get some from sketchup.
For the point you just assign the LotTree startrule and generate.

tree_tex = fileRandom("assets/trees/alleyTree_*_v1.obj")

LotTree--> s(0,rand(8,12),0) center(xz) i(tree_tex) Tree.

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