Mr schrieb:
> Yet I'm not sure it will work as I'm trying to use the back diffuse light which
> i guess doesn't show without transparency, does it?

It does.

Transparency is really only needed to have things on the other side be 
plainly visible, unblurred.

Backside illumination is there to do exactly the opposite: Make an 
object appear translucent, /without/ making things on the other side 
plainly visible.

Note however that in order for backside diffuse illumination to do 
anything useful, your objects must be either non-solid (i.e. just one 
infinitely thin surface), or you must use radiosity for the light to 
carry all the way through the object.

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