Some trees are glowing while using the Glow post processor

Hi all,

I try to apply the glow post processor on my scene and everything works fine except for some tree within the terrain assets package. For instance the willow is glowing even when I adjusted the alpha values to 0 of the attached materials. When I switch to Alpha view withing the scene editor I can see the bark of the willow is still visible.

Anyone any idea what I've missed?

Kind regards,

Wim Vancoillie

PS: I'm using unity 3D pro 3.3