In the following minimal scene...

#declare SphereRad=1;
camera { location 5*y look_at 0 }
light_source { <10,10,0> color rgb 1 }
plane { y,-1 pigment { color rgb 0.8 } }
sphere { 0,SphereRad pigment { color rgbt <1,0,0,0.9> } }

..... when the sphere touches the plane (when SphereRad=1.0) there a spot
appears at the point of intersection in 3.7-beta21a which isn't there in
3.6. It is a 'real' thing which also gets enlarged when the sphere is given
an ior (1.5). Changing the lightsource- or camera-position doesn't change
this.

Jeroen.

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