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Coincident surfaces in partially transparent
unions are making light spots in shadows.
I verified that this is the case with 3.7 beta 22,
but I'm not sure how many betas back this
snuck in.
This was not the case in 3.6.
Here is a minimal test scene that looks right
in 3.6 but looks wrong in 3.7 beta 22.
#declare testmat = material { texture {
pigment {color <1,0,0> transmit 0.5}
}};
camera { location <1.0, 2.0, -4.0>
direction 1.5*z
right x*image_width/image_height
look_at <1.0, -0.2, 0.0>
angle 30 }
light_source {<-10, 10, -5> color rgb <1, 1, 1>}
plane {y,-1 pigment{rgb <1,1,1>}}
union {
sphere {<0.0,0,0>,0.5 material{testmat}}
sphere {<0.1,0,0>,0.5 material{testmat}}
sphere {<0.2,0,0>,0.5 material{testmat}}
sphere {<0.3,0,0>,0.5 material{testmat}}
sphere {<0.4,0,0>,0.5 material{testmat}}
sphere {<0.5,0,0>,0.5 material{testmat}}
}
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