Talk:UV mapping

This needed an article --Shell 02:56, 19 December 2005 (UTC)[reply]

This article is awful

Sorry, but it just stinks. And the caption on the photo doesn't match the text. (One says "With and Without" and the other says "without and with") —Preceding unsigned comment added by 69.228.240.57 (talk) 06:05, August 26, 2007 (UTC)

Unfortunately, I'll have to agree. I came here hoping to learn what UV mapping is, but this article is in no way fit to explain it. I'll try to qualify:

First of all, I made the following assumptions based on my little knowledge of 3D modeling/rendering/mapping: Texture mapping basically means 'painting' a 3D object with an image, rather than with just a color or a pattern. Different geometric transformations might be used in the process, yielding different results.

UV mapping is a 3D modeling process of making a 2D image representing a 3D model.

Does "2D image" refer to the texture or a final rendered image? If it refers to the rendered image, that should be stated clearly in order to avoid confusion. If it refers to the texture, how is the modeling process involved with "making" the image?

The map transforms the 3D object onto an image known as a texture.

This is confusing. I somehow expected the image to be "transformed onto" the 3D object, not vice versa. But this may be what is going on 'behind the scenes', so I'm fine with it – just maybe add a couple of words to explain.

In contrast to "X", "Y" and "Z", which are the coordinates for the original 3D object in the modeling space, "U" and "V" are the coordinates of the transformed object.

Why mention X,Y,Z as though they were set in stone? It might as well be (r, θ, φ). What are we talking about here? Cartesian vs. Polar, 3D vs. 2D? X,Y,Z and U and V are just arbitrary names for variables. They explain nothing and have no inherit meaning.

This creates the effect of painting the image onto the surface of the 3D object.

That actually comes as quite a surprise at this point.

And then, a little later:

Without UV mapping, the checkers tile XYZ space and the sphere is carved out of them.

Huh? How can you carve a 3D object out of a 2D image?

So these are the 'impressions' of someone who doesn't know what UV-mapping is. Maybe it will help someone who does to improve the article. Thanks. --Ruper222 (talk) 02:13, 15 May 2008 (UTC)[reply]

Article needs expansion

Assuming UV mapping works the same way across most implementations, why not treat it as a kind of mathematical article and explain HOW it works, not just WHAT it is? --67.183.186.73 00:13, 23 August 2006 (UTC)[reply]

So which is which?

In XYZ, I know which coordinate means what in space. But what directions do U & V have? --24.249.108.133 17:58, 13 November 2006 (UTC)[reply]

UV are the coordinates in 2D (so the image you're wrapping around the 3D object) - you could see them as X and Y in 2D. - Simeon87 12:50, 15 November 2006 (UTC)[reply]

Yeah, also I believe X is red, Y is green, and Z is blue. KenFehling 05:12, 24 July 2007 (UTC)[reply]

Poor image example

The horrid image shows a triangle and a sphere that look no different than planar and spherical mapping. This needs a new image.

My thoughts exactly. --24.249.108.133 23:18, 28 February 2007 (UTC)[reply]

I created an image of UV mapping on a sphere, but it's still just spherical mapping. Some kind of mesh perhaps? —Josh Lee 20:37, 17 June 2007 (UTC)[reply]

terms not defined

$u=\sin \theta \cos \phi ={\frac {x}{\sqrt {x^{2}+y^{2}+z^{2}}}}$

What are theta and phi? --JWSchmidt 21:53, 9 July 2007 (UTC)[reply]

Poor example UV mapping

The example UV mapping given is a rather poor one, as it is just a projection of the sphere surface onto the x-y plane. This means that the top and bottom hemispheres will have the same UV coordinates. It would be much better to show an example UV mapping based on spherical polar coodinates (e.g. a latitude-longitude UV mapping). 121.73.55.195 (talk) 04:15, 5 June 2008 (UTC)[reply]

Proposal new image

Would this image be valuable addition to this UV-Mapping page? At least this image relates more to the concepts of UV-mapping than the other pictures do so far.

Tschmits (talk) 09:49, 16 August 2008 (UTC)[reply]