I am using an image_map with transparent areas in front of a mirror
 plane { z,0
    texture{
      pigment { image_map{ png "front.png" map_type 0 interpolate 2 once }} }
    finish { reflection 0 ambient 1 diffuse 0 }
 }
 plane { z,-0.000001
    finish { reflection {0.6} ambient 0.5 diffuse 0 }
 }
 plane {  z,10
    texture{
      pigment { image_map{ png "opposite.png" map_type 0 interpolate 2 once }} }
    finish { reflection 0 ambient 1 diffuse 0 }
 }

Everything was good with 3.6, but moving to 3.7, I had to increase the distance
between the texture and the mirror in order to see something else than black
areas on transparent parts.

Is this an intended behavior ?

Bastien Jacquet

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