> Tim, what do you mean exactly by 'transmit overloading'? After editing, 
> also commenting out the pigment{Clear}, the texture should look like 
> this', shouldn't it?

After converting with PoseRay the pigments look like this...

#declare p_map1=pigment {uv_mapping image_map{
 png "E:\graphics\ivy_gen\textures\efeu1.png"
 interpolate 2 transmit all 0 filter all 0} }

but they should look like this ... flipped over ... without
the transmit all...

#declare p_map1=pigment {uv_mapping image_map{
   png "E:\graphics\ivy_gen\textures\efeu1.png"
   }rotate<0,0,180>}

and the layered material looks like this ...

#declare leaf_adult_=
material{
texture{pigment {color rgb <1,1,1> transmit  0}
        finish{phong 0.2980392 phong_size 36.25229 diffuse 0.6*1
        ambient rgb <0,0,0> reflection{0 metallic}}}
texture{pigment{p_map1}
        finish{ phong 0.2980392 phong_size 36.25229 diffuse 0.6*1
        ambient rgb <0,0,0> reflection{0 metallic}}}
}

but can be simply

#declare leaf_adult_=  material{
texture{pigment{p_map1}
        finish{ phong 0.2980392 phong_size 36.25229 diffuse 0.6
        ambient rgb <0,0,0> reflection{0 metallic}}}
}

the transparency info is already in the PNG

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