> I played a bit with the settings. To me it looks like the final specular
and
> reflection values are the sum of those in the layered textures.

I am not surprised by this.

specular 0.5 * transmit 0.2 + specular 0.5 = 0.6
reflection 0.5 * transmit 0.2 + reflection 0.5 = 1.0

But as you see there's a bug.. Try this:

#declare Texture_1=texture {
  pigment {rgb <1,1,1> }
  finish { specular 0 diffuse 0 brilliance 0 reflection 0.5 }
}

#declare Texture_2=texture {
  pigment { rgbt <0,0,1, 0.1> }
}

And change the transmit up and down. Reflection keeps being 0.5.


Regards,
Hugo

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