Hi all,
        I think I've just found a bug in POV-Ray 3.02. I'm running the
windoze
version under Win95.
If you rotate an object with a normal{ average normal_map{}} then
rotating the object seems to affect the normal.
In the example below, in and out seem to be reversed when the object is
rotated 180 degrees around the z axis.
The top two cylinders have a simple normal.
The bottom two have the same normal as the only entry in an average.

(there's a picture in binaries.images)

Anyone seen this effect? Know how to fix it?
Cheers, PoD.

#include "colors.inc"

camera{ right 4/3*x direction z*3 location <0,0, -30> look_at <0,0,0> }

light_source{ <1000,2000,-5000> White }

#declare Norm1 = normal{radial .5 frequency 16 scallop_wave}
#declare Norm2 = normal{ average normal_map{[1 Norm1]}}
#declare Obj1 = cylinder{-y,y,1 pigment{White}  normal{Norm1}}
#declare Obj2 = cylinder{-y,y,1 pigment{White}  normal{Norm2}}

object{ Obj1 translate <-1.5,1.5,0> }
object{ Obj1 rotate z*180 translate <1.5,1.5,0> }
object{ Obj2 translate <-1.5,-1.5,0> }
object{ Obj2 rotate z*180 translate <1.5,-1.5,0> }

union{
        cone{ <1.5,-3,0>,0, <1.5,-3.5,0>,.5 }
        cylinder{ <1.5,-3.5,0>,<1.5,-4,0>,.25 }
        scale<1,1,.1>
        pigment{White}}

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