Hi Kirgman.

I recently encountered a problem that I can't find a solution for.

It's an unwanted effect when I use the alpha channel and two surfaces are very close together.

It doesn't create an unwanted shadow. Rather, it creates a bounce of indirect light, creating shadow or light depending on the indirect light value.

I have to adjust the value to make the effect disappear, compromising the lighting I really want.

I've used the Centileo tag on the affected objects, which allows me to avoid them being affected by the GI, but the desired effect isn't achieved.

Best.