| The OpenGL Programming Guide - The Redbook Recent countries visiting this post |  |
 | 175 | United States |
 | 61 | |
 | 12 | Germany |
 | 12 | India |
 | 9 | Japan |
 | 8 | United Kingdom |
 | 8 | Canada |
 | 8 | Czech Republic |
 | 7 | China |
 | 6 | Italy |
 | 5 | Austria |
 | 5 | New Zealand |
 | 4 | Russian Federation |
 | 4 | Mexico |
 | 3 | Poland |
 | 3 | Chile |
 | 3 | Turkey |
 | 2 | Korea, Republic of |
 | 2 | Bahrain |
 | 2 | Kenya |
 | 2 | France |
 | 2 | Singapore |
 | 1 | Vietnam |
 | 1 | Brazil |
 | 1 | Romania |
 | 1 | Portugal |
 | 1 | Australia |
 | 1 | Finland |
 | 1 | Spain |
 | 1 | Argentina |
 | 1 | Ukraine |
 | 1 | Netherlands |
 | 1 | Hong Kong |
 | 1 | Israel |
 | 1 | Egypt |