how to render a Tree model in Arnold with transparent textures

[mikhailkonstantin3d]

hello there, i am stuck on something, and it is a tree models i have downloaded and i can't render them in Arnold, they become transparent .. or they don't even use the transparent ! this is the file , please check it and thank you in advance 

download the direct file here 

[Stephen.Blair]

Don't use lambert, use standard surface (and Opacity)

[mikhailkonstantin3d]

yes, i did that, but Arnold is showing the transparency, showing it like a glass .. or sometimes just showing white color 

[mikhailkonstantin3d · Accepted solution]

Hello all, after a deep search i have found the answer by myself .. just follow this tutorial and you will get it 

https://www.youtube.com/watch?v=82Vgd0E3p2w

[Stephen.Blair · Accepted solution]

Using the branch.png texture: