Hi, can the slope pattern be used with a slope_map? The docs say:
"A slope_map may be used with any pattern except brick, checker, object,
hexagon, bumps, dents, ripples, waves, wrinkles and bump_map."
So it should work? But the following piece of code doesn't  give any kind of
ramp:

#include "colors.inc"
camera{location<0,0,-5>
              look_at<0,0,0>}
light_source{<-10,10,-50>color White*2}
#declare Slopenormal= normal{slope{<0,-1,0>,0,1}

                                       slope_map{[0 <1,0>]
                                                            [.4 <1,-1>]
                                                            [.5 <0,0>]
                                                            [1 <0,0>]} }



sphere{<0,0,0>,1 pigment{color Grey}
                              normal{Slopenormal}}

If I understand this correctly this should give me a ramp down somewhere
little above the middle of the sphere.
What am I missing?

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