> I've noticed what I think is a bug with bump mapping onto a torus (map_type 5).
> The inner part of the torus (the part where the radius (from origin to
> intersection point) is less than the major radius) has inverted normals or has
> correct normals and the outer part has inverted normals.  In other words, inner
> bumps become outer as soon as you cross the major radius line (on both bottom
> and top of torus).  I would provide an image that clearly shows this, but this
> group doesn't seem to allow attachments.  I'm using POV ray 3.62 on Windows XP
> -32 bitand I also tried it on an old version of POV Ray.  Thanks for any help.
>
> Here's my scene:
>
> // Persistence Of Vision raytracer version 3.1 sample file.
> // Bump map example
> // Based on File by Drew Wells
>
> global_settings { assumed_gamma 2.2 }
>
> #include "colors.inc"
>
> camera {
> //   location<0, 0, -120>
> //   direction<0, 0,  1.5>
>     location<-1, 20, -2>*.2
> //   location<-15, 10, -20>*.4
> //   direction<0, 1.5, 0>
>     up<0, 1,  0>
>     right<4/3, 0,  0>
>     look_at<0, 0,  0>
> }
>
> torus { 1, .4
>    pigment {White}
>
>     normal {
>        bump_map {
>           ppm "e:\stuff\ray\scr\bump\3365-b~1.ppm"
>           bump_size 10
>           interpolate 2
>           map_type 5
>        }
>        //scale 15
>        //translate<-12.5, -12.5, 0>
>        //translate<-25, -25, 0>
>     //rotate 90*z
>     //rotate 90*x
>     }
>     finish {ambient 0.2 diffuse 0.7 specular 0.6}
> }
>
>
> light_source {<-2,3,3>  colour rgb<.2, .2, .2>  shadowless }
> light_source {<-15,10,-20>  colour White shadowless }
>
>
>

I see the same thing here with version 3.7. Same OS.

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