# Talk:Surface Normals

The content on this page was written by Steve Cunningham. I am just doing formatting and will make a main image for the page.

Nordhr 11:40 1 July 2011

## Checklist

### Message to the Future

• I don't personally really see anything this page is missing, so I don't have a message to the future.

### References and Footnotes

• I made the main image (which it says in the discussion section of the image)
• The other image was provided by Steve Cunningham (which it says in the discussion section of that image)
• Steve Cunningham wrote the page from his knowledge, so it says so in the reference section.

### Good Writing

#### Context

• In the 'why is this interesting' section I explain that surface normals can be used for lighting and silhouette edges.

#### Quality of prose and page structuring

• The beginning part of the page explains what it is going to be about and a little of the context.
• Sections have a clear purpose
• The page is short and specific enough that I don't think that making any helper pages is warranted.
• The math is all grouped together near the bottom of the "More Mathematical Explanation" section.

#### Connections to other mathematical topics

This page is said to lie in the fields of algebra and calculus. I agree with calculus, certainly -- lots of derivatives here -- but not with algebra. instead I would suggest the fields of calculus and geometry, since normals are geometric constructs. SteveC
I definitely agree. I think that may have even been my original intention, but algebra is the default category. I think I might have mis-clicked. --Nordhr

#### Examples, Calculations, Applications, Proofs

• The analytic normal section explains where the formulas come from.

#### Mathematical Accuracy and precision of langage

• This page has been proofread by others and me and I believe it is free of mathematical errors.
• I believe that the language is very explanatory and clear.
• The word "normalized" needs a mouse over definition
I added a mouse over for normalized --Nordhr
• "Bézier patches" needs to be defined AnnaP 16:29, 3 August 2011 (UTC)
I decided to put a link to the wiki page on Bézier surfaces, because it seems like they are a hard thing to give a simple definition for. --Nordhr (August 3)

#### Layout

• Text is in short easy to read paragraphs. There aren't as many images on this page, but it isn't something that lends itself well to a bunch of images.
• All of the scary math is hidden in the math section. I don't think that this page is long enough to have a second hidden section.
• The only obvious whitespace is around the image (not the main page image), and I don't see an easy way to fix that. If I right align that image I think it looks funny with the main image on the page, and if I left align it, it messes with the margins.
• The image on the page is completely contained in the correct section.
• The hidden text looks good.
• The page looks good in pretty much all sizes