POV-Ray : Newsgroups : povray.bugreports : uv_mapping bug on cylinders : Re: uv_mapping bug on cylinders Server Time
8 Aug 2022 22:15:47 EDT (-0400)
  Re: uv_mapping bug on cylinders  
From: Chris R
Date: 3 Aug 2022 10:45:00
Message: <web.62ea89b1f9bd2f341ec2018a5cc1b6e@news.povray.org>
"Chris R" <car### [at] comcastnet> wrote:
> I encountered an issue with v3.8 beta 2 using uv_mapping textures on cylinders
> while creating a label for a bottle.  I did search through the newsgroups for
> any other report of this and didn't find anything that matches my problem.
>
> The original texture is fairly complex and involves using an object pattern with
> a text object as the "object" and fully-specified textures for the ink and the
> background of the label as the texture list.  However, I was able to simplify it
> considerably to the following:
>
>             cylinder {
>                 <0, 0, 0>,
>                 <0, 20, 0>,
>                 5
>                 texture { uv_mapping pigment { brick color rgb 0 color rgb 1 } }
>             }
>             cylinder {
>                 <0, 0, 0>,
>                 <0, 20, 0>,
>                 5
>                 texture { uv_mapping pigment { brick color rgb 0 color rgb 1 } }
>                 translate <20, 0, 0>
>             }
>
> As you can see, the second cylinder is translated after applying the texture,
> but if you look at the brick pattern, it appears the uv_mapping is being applied
> to the translated object first, because the bricks do not line up.
>
> In my bottle example, the text doesn't show up at all in the translated bottle,
> because the entire bottle is outside of the text object's boundaries after it is
> translated.
>
> -- Chris R.

Just as additional information, adding a "translate <20, 0, 0>" after the
pigment declaration in the second texture corrects the problem.

-- Chris R.


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