POV-Ray : Newsgroups : povray.newusers : Advice on how to generate labeled surface Server Time
31 Oct 2024 19:16:35 EDT (-0400)
  Advice on how to generate labeled surface (Message 1 to 4 of 4)  
From: Bald Eagle
Subject: Advice on how to generate labeled surface
Date: 1 Apr 2014 16:40:01
Message: <web.533b2330cf09dd6b76fce390@news.povray.org>
I'd like to be able to do this or similar:
http://home.online.no/~t-o-k/POV-Ray_Images/NURBS_Bivariate.jpg

Is this done with a texture?
UV mapping? (my best guess)

Thanks to anyone who can give me some tips or a full-fledged solution.

Bill


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From: Alain
Subject: Re: Advice on how to generate labeled surface
Date: 1 Apr 2014 19:03:47
Message: <533b45d3@news.povray.org>

>
> I'd like to be able to do this or similar:
> http://home.online.no/~t-o-k/POV-Ray_Images/NURBS_Bivariate.jpg
>
> Is this done with a texture?
> UV mapping? (my best guess)
>
> Thanks to anyone who can give me some tips or a full-fledged solution.
>
> Bill
>
>

Tor Olav Kristensen used a nurb macro of his making that create a mesh 
that can be UV mapped.
That image is an example of that macro.


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From: Bald Eagle
Subject: Re: Advice on how to generate labeled surface
Date: 2 Apr 2014 15:09:33
Message: <533c606d@news.povray.org>
On 4/1/2014 7:03 PM, Alain wrote:

> Tor Olav Kristensen used a nurb macro of his making that create a mesh
> that can be UV mapped.
> That image is an example of that macro.

OK,  I'll have to learn some about this NURBS spline.

I got a simple grid made, and image-mapped it, and got something close.
Since it's not NURBS, the extreme curvatures really distort the lines 
and text, but I get the idea.
Granted, my layered texturing is BAAAAD, but it's OK for a WIP.
See in p.b.images


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From: Bald Eagle
Subject: Reverse engineer mapping transformation?
Date: 4 Apr 2014 14:37:02
Message: <533efbce$1@news.povray.org>
So, I wrapped a grid around some items, and the graphic file obviously 
gets distorted in places.

Is there a way to create a object whose length and width vary as the 
inverse of the mapping transformation?  I'd probably be able to puzzle 
this out in 2d, but the 3D solution is a little intimidating.

I know squat about NURBS, and this would a good first approximation to 
getting the grid to retain most of its shape.


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