Question billboard "atlas image" exact position ?

Hello,

I try to build a billboard of a tree.

according to this : https://docs.unity3d.com/ScriptReference/BillboardAsset.html


----
I made "8 screenshots" of my object with 8 cameras at exact position ref this documentation,
... to create a sort of texture atlas image ...
for the "Shader "Universal Render Pipeline/Nature/SpeedTree7 Billboard" shader

The result seems valid, i have a working rendered billboard, with different faces......face are all changing according to position, but not displayed in the correct order.


The "screenshot 0" should be at which position in the atlas ?
The "screenshot 1" should be at which position in the atlas ?
what should be at the 9th position since there is only 8 images ?
...




can't find the exact requirement... i tried to guess according to different object shape and color ... but then i create a new one and it's wrong


If anyone can help me ,
thanks a lot !

 

Ok i think i finally got it :

in case it may help someone in the future :


/*
text coord 0= (0.00, 0.67, 0.33, 0.33)
text coord 1= (0.33, 0.67, 0.33, 0.33
text coord 2= (0.67, 0.67, 0.33, 0.33)
text coord 3= (0.00, 0.33, 0.33, 0.33)
text coord 4= (0.33, 0.33, 0.33, 0.33)
text coord 5= (0.67, 0.33, 0.33, 0.33)
text coord 6= (0.00, 0.00, 0.33, 0.33)
text coord 7= (0.33, 0.00, 0.33, 0.33)
*/

last one is unused