POV-Ray : Newsgroups : povray.advanced-users : image_map cylinderical mapping: How to wrap image only half around? Server Time
25 Dec 2024 14:14:43 EST (-0500)
  image_map cylinderical mapping: How to wrap image only half around? (Message 1 to 2 of 2)  
From: Icetoaster
Subject: image_map cylinderical mapping: How to wrap image only half around?
Date: 6 May 2006 18:25:00
Message: <web.445d21af805f09d2301b9f60@news.povray.org>
Hi,

I have a image_map like this one:
cylinder { <0,0,0>,<0,2.5,0>, 0.40
  texture{
   pigment{ image_map{ png "mypic.png"
    map_type 2 // cylindrical mapping
    once interpolate 2 }
   }
   scale <0.5,1,0.5>
  }
}

The image is wrapped around 360 deg of the cylinder.
How can I wrap it only around half of the cylinder (180 deg) or how can I
map the image only in an arbitrary degree sector?

I fumbled around with scaling the texture, but scaling x and z does not
have any effect on the result.

Any ideas?

Thanks for help!


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From: Warp
Subject: Re: image_map cylinderical mapping: How to wrap image only half around?
Date: 6 May 2006 20:36:08
Message: <445d40f8@news.povray.org>
Icetoaster <icetoaster_at_gmx.de> wrote:
> Any ideas?

  Use planar mapping instead, scale the image to half in the x-direction
and then apply a cylindrical warp to the pigment.

-- 
                                                          - Warp


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