POV-Ray: Newsgroups: povray.general: bump

POV-Ray : Newsgroups : povray.general : bump_trouble		Server Time 1 Nov 2024 21:21:53 EDT (-0400)

From: Remco de Korte
Subject: bump_trouble
Date: 19 Jul 1999 04:54:26
Message: <3792E7EE.278889B3@xs4all.nl>

I'm having some trouble with bump_maps. It seems that when I apply a spherical
or cylindrical bump_map to an object and then rotate that object (around the
y-axis) the bump_map won't rotate with it. Could someone verify this? It doesn't
really matter what code I use, because I've tried it in several ways.

Regards,

Remco
http://www.xs4all.nl/~remcodek/pov.html

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From: Ken
Subject: Re: bump_trouble
Date: 19 Jul 1999 05:21:23
Message: <3792ED76.575207B3@pacbell.net>

Remco de Korte wrote:
> 
> I'm having some trouble with bump_maps. It seems that when I apply a spherical
> or cylindrical bump_map to an object and then rotate that object (around the
> y-axis) the bump_map won't rotate with it. Could someone verify this? It doesn't
> really matter what code I use, because I've tried it in several ways.
> 
> Regards,
> 
> Remco
> http://www.xs4all.nl/~remcodek/pov.html

 Using Pov v3.1g and the following code I could not duplicate your problem.
Either one of the two commented out rotates rotated the bump map predictably
the same amount. Pov.gif was simply a gif image with a black background and
the word Pov printed in white. I did not try it with cylindrical mapping
but spherical worked just fine.

  sphere  { 0,1 
 pigment  { rgb 1}
  normal  {
 bump_map { gif "pov.gif" interpolate 2 map_type 1 bump_size 1}
            // rotate 90*-y
          }
            // rotate 90*-y
          }

-- 
Ken Tyler

mailto://tylereng@pacbell.net
http://home.pacbell.net/tylereng/links.htm

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From: Remco de Korte
Subject: Re: bump_trouble
Date: 19 Jul 1999 06:06:02
Message: <3792F88F.D7290326@xs4all.nl>

Ken wrote:
> 
> Remco de Korte wrote:
> >
> > I'm having some trouble with bump_maps. It seems that when I apply a spherical
> > or cylindrical bump_map to an object and then rotate that object (around the
> > y-axis) the bump_map won't rotate with it. Could someone verify this? It doesn't
> > really matter what code I use, because I've tried it in several ways.
> >
> > Regards,
> >
> > Remco
> > http://www.xs4all.nl/~remcodek/pov.html
> 
>  Using Pov v3.1g and the following code I could not duplicate your problem.
> Either one of the two commented out rotates rotated the bump map predictably
> the same amount. Pov.gif was simply a gif image with a black background and
> the word Pov printed in white. I did not try it with cylindrical mapping
> but spherical worked just fine.
> 
>   sphere  { 0,1
>  pigment  { rgb 1}
>   normal  {
>  bump_map { gif "pov.gif" interpolate 2 map_type 1 bump_size 1}
>             // rotate 90*-y
>           }
>             // rotate 90*-y
>           }
> 
> --
> Ken Tyler
> 
> mailto://tylereng@pacbell.net
> http://home.pacbell.net/tylereng/links.htm

I see what I have been doing wrong now. The bump_map I was using didn't make
things very clear, with another gif I could figure it out. So, I should've tried
a little harder...
Thanks!

Remco

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