changelog
    
    
    - Tue, 19 Jun 2018 23:59:05 +0300
 
    - by Teemu Piippo <teemu@hecknology.net> [Tue, 19 Jun 2018 23:59:05 +0300] rev 1414
 
    - simplified
 
    - Tue, 19 Jun 2018 23:56:07 +0300
 
    - by Teemu Piippo <teemu@hecknology.net> [Tue, 19 Jun 2018 23:56:07 +0300] rev 1413
 
    - added buttons to rotate circular primitives
 
    - Tue, 19 Jun 2018 23:18:58 +0300
 
    - by Teemu Piippo <teemu@hecknology.net> [Tue, 19 Jun 2018 23:18:58 +0300] rev 1412
 
    - added support for inverting circular primitives
 
    - Tue, 19 Jun 2018 22:45:10 +0300
 
    - by Teemu Piippo <teemu@hecknology.net> [Tue, 19 Jun 2018 22:45:10 +0300] rev 1411
 
    - fixed generation of disc negatives
 
    - Tue, 19 Jun 2018 22:00:46 +0300
 
    - by Teemu Piippo <teemu@hecknology.net> [Tue, 19 Jun 2018 22:00:46 +0300] rev 1410
 
    - simplified
 
    - Tue, 19 Jun 2018 21:57:39 +0300
 
    - by Teemu Piippo <teemu@hecknology.net> [Tue, 19 Jun 2018 21:57:39 +0300] rev 1409
 
    - fixed chord triangle count formula
 
    - Tue, 19 Jun 2018 21:49:21 +0300
 
    - by Teemu Piippo <teemu@hecknology.net> [Tue, 19 Jun 2018 21:49:21 +0300] rev 1408
 
    - fixed bugs regarding primitives, added chord substitution
 
    - Sun, 17 Jun 2018 17:07:29 +0300
 
    - by Teemu Piippo <teemu@hecknology.net> [Sun, 17 Jun 2018 17:07:29 +0300] rev 1407
 
    - added support for open/closed cylinders in LDCircularPrimitive
 
    - Sun, 17 Jun 2018 16:13:24 +0300
 
    - by Teemu Piippo <teemu@hecknology.net> [Sun, 17 Jun 2018 16:13:24 +0300] rev 1406
 
    - Circular primitive editor complete
 
    - Sun, 17 Jun 2018 14:06:03 +0300
 
    - by Teemu Piippo <teemu@hecknology.net> [Sun, 17 Jun 2018 14:06:03 +0300] rev 1405
 
    - replaced overloads with a new 'xyz' function
 
    - Sun, 17 Jun 2018 13:57:00 +0300
 
    - by Teemu Piippo <teemu@hecknology.net> [Sun, 17 Jun 2018 13:57:00 +0300] rev 1404
 
    - replaced GLRotationMatrix with QMatrix4x4
 
    - Sun, 17 Jun 2018 13:53:33 +0300
 
    - by Teemu Piippo <teemu@hecknology.net> [Sun, 17 Jun 2018 13:53:33 +0300] rev 1403
 
    - replaced the Matrix class with QMatrix4x4
 
    - Sun, 10 Jun 2018 23:25:08 +0300
 
    - by Teemu Piippo <teemu@hecknology.net> [Sun, 10 Jun 2018 23:25:08 +0300] rev 1402
 
    - some rework in description
 
    - Sun, 10 Jun 2018 23:07:24 +0300
 
    - by Teemu Piippo <teemu@hecknology.net> [Sun, 10 Jun 2018 23:07:24 +0300] rev 1401
 
    - fixed bugs regarding circular primitives