From Valve Developer Community
Revision as of 13:55, 6 January 2009 by TomEdwards (talk | contribs)

(diff) ← Older revision | Latest revision (diff) | Newer revision → (diff)
Jump to: navigation, search

A vertex is a point in space that forms one of the three points of a polygon. It can be represented with an XYZ vector, such as (0 0 0).

Vertices (not "vertexes"!) are by themselves invisible. It is the polygon they come together to form that is rendered. However, they do contain a 'normal' component that decides the direction from which the most light is received by the attached polygon corner. This is also represented by a vector: the default is (0 0 1), which means "full intensity straight up".