I did what said Zach :

2) Add a material to the top of the node's hierarchy, and then apply alpha
values to it.

And it works very well. Thanks !
2007/4/18, Paul Martz <[EMAIL PROTECTED]>:

 I believe you can set a BlendColor state attribute at your top level node
to achieve this effect.
   -Paul


 ------------------------------
*From:* [EMAIL PROTECTED] [mailto:
[EMAIL PROTECTED] *On Behalf Of *christophe loustaunau
*Sent:* Wednesday, April 18, 2007 6:46 AM
*To:* osg users
*Subject:* [osg-users] transparency on a node


 Hello !

I have some questions about transparency.
I load a file (ive) into a node, and then i wan't this node to be more and
more transparent.

I think i can do this with blending and the value of alpha. But we can't
do a
setcolor(r,g,b,a), on a node, so..

Next i have look the nodeMask. with it i could hide the node completely
but not progressivly.

I someone have an idea how doing this it will be helpfull.

thanks



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