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> Do the speckes disappear if you specify an ior or reflection for the
> objects?
It looks like the speckles are there even with ior or reflection or with
max_trace_level boosted.
> Could you build a minimal scene which demonstrates the problem?
Sure, this shadow looks banded by coincident surfaces in 3.7
but not in 3.6
#declare testmat = material { texture {
pigment {color <1,0,0> transmit 0.5}
// finish { reflection 0.1 }
}
// interior{ior 1.1}
};
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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