> I tried transmit instead of filter.....and it works.

Here's the deal:

Filter does not work because the texture is black.  If you use filter 1.0
with a black texture, no light will get through because filter works by
multiplying the transmitted light by the pigment color.  That way, if you
use filter 1.0 with a blue pigment, only blue light will get through.  If
you want all light to get through, use transmit.

HOWEVER, filter works differently in the official version because you're
using a layered texture.  In the official version, layered textures treat
filter as if it were transmit.  This, in my opinion, is not correct, so it
has been "fixed" in MegaPov.

In other words, the official version is incorrect, and MegaPov is correct.
You should use transmit 1.0 in this case.

-Nathan

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