opacity map with vray matlib

[miki72]

hi
dos any one know if i can creat a tree with a picture of a tree and it's alpha chenel like i do with the max matlib but only the same on the matlib of vray?

[gafl]

Hi Miki72 !

Use the refraction slot to put a Black and White image for opacity,
You may have to "inverse" the image to get White and Black, it works
in the inverse of a standard material.
Check the "Affect Shadow" and it should work.

Bye !

Gaël

[miki72]

didnt work for me

my alpha chenel is in the same image of the tree and wen i put it like you say in the refraction it didnt work for me

mabe im mising somthing?

[oconv]

try to separate the channels in two files. then it should work.

[Da_elf]

i do it all the time with tiff images with alpha.
a: make sure to set ior to 1.0
b: add your image to refraction
c: i usually change mono channel output and RGB channel output to alpha and alpha as grey respectively.
d: its goot to remove the blur on the bitmaps i find.
e: and dont forget to invert your image in output

[miki72]

hey thanks
i did it with youre help