Editing Shading (section)

===Surface angle to a light source===
Shading alters the colors of faces in a 3D model based on the angle of the surface to a light source or light sources.

The first image below has the faces of the box rendered, but all in the same color. Edge lines have been rendered here as well which makes the image easier to see.

The second image is the same model rendered without edge lines. It is difficult to tell where one face of the box ends and the next begins.

The third image has shading enabled, which makes the image more realistic and makes it easier to see which face is which.
{{multiple image
 | align = center
 | image1 = Shading1.png
 | caption1 = Rendered image of a box. This image has no shading on its faces, but instead uses ''edge lines'' (also known as ''[[wire-frame model|wireframe]]'') to separate the faces and a bolder ''outline'' to separate the object from the background.
 | image2 = Shading2.svg
 | caption2 = This is the same object with the lines removed; the only indication of the interior geometry are the points of the object's [[silhouette]].
 | image3 = Shading3.svg
 | caption3 = This is the same object rendered with ''flat shading''. The color of the 3 visible front faces has been set based on their angle (determined by the [[normal vector]]) to the light sources.
}}