Transparent godray effect

Hello,

I’m sure I’ve made this effect work within unity before but am having trouble making the object transparent according to the texture. The texture is saved as .PSD for testing.

I have this texture in photoshop:

Transparent Texture

Maybe I’m doing something fundamentally wrong in Unity (Using a wrong shader) but using the "Unlit/Transparent seemed to give me the best but not desired effect:

Unity Godray

As you can see, the parts that I assume should be transparent in Unity, arent. It’s almost a transparent white.

This could help: http://docs.unity3d.com/Documentation/Manual/HOWTO-alphamaps.html

And maybe this: http://www.youtube.com/watch?v=sMR_R72bWzw