User talk:63.254.139.28

October 2018
Hello, I'm Dan Koehl. I wanted to let you know that I undid one of your recent contributions, such as the one you made with this edit to Graphics Programming (Real Time), because it didn’t appear constructive to me. If you think I made a mistake, or if you have any questions, you can leave me a message on my talk page. Thanks. Dan Koehl (discuss • contribs) 13:09, 5 October 2018 (UTC)