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
 
    - Sun, 10 Jun 2018 21:48:58 +0300
 
    - by Teemu Piippo <teemu@hecknology.net> [Sun, 10 Jun 2018 21:48:58 +0300] rev 1400
 
    - refactored LDPolygon
 
    - Sun, 10 Jun 2018 17:17:42 +0300
 
    - by Teemu Piippo <teemu@hecknology.net> [Sun, 10 Jun 2018 17:17:42 +0300] rev 1399
 
    - added the disc and disc negative to the circular primitive type
 
    - Sun, 10 Jun 2018 16:50:14 +0300
 
    - by Teemu Piippo <teemu@hecknology.net> [Sun, 10 Jun 2018 16:50:14 +0300] rev 1398
 
    - changed LDCylinder to LDCircularPrimitive and moved circles to it
 
    - Sun, 10 Jun 2018 16:04:38 +0300
 
    - by Teemu Piippo <teemu@hecknology.net> [Sun, 10 Jun 2018 16:04:38 +0300] rev 1397
 
    - cleaned up LDColor constructors
 
    - Sun, 10 Jun 2018 15:53:21 +0300
 
    - by Teemu Piippo <teemu@hecknology.net> [Sun, 10 Jun 2018 15:53:21 +0300] rev 1396
 
    - show the color index in the color button
 
    - Sun, 10 Jun 2018 12:12:50 +0300
 
    - by Teemu Piippo <teemu@hecknology.net> [Sun, 10 Jun 2018 12:12:50 +0300] rev 1395
 
    - separated the color button into a new widget
 
    - Fri, 08 Jun 2018 23:06:56 +0300
 
    - by Teemu Piippo <teemu@hecknology.net> [Fri, 08 Jun 2018 23:06:56 +0300] rev 1394
 
    - fixed cylinder rendering
 
    - Thu, 07 Jun 2018 23:24:02 +0300
 
    - by Teemu Piippo <teemu@hecknology.net> [Thu, 07 Jun 2018 23:24:02 +0300] rev 1393
 
    - changed rotation matrix to quaternion in GLRenderer
 
    - Mon, 04 Jun 2018 23:22:52 +0300
 
    - by Teemu Piippo <teemu@hecknology.net> [Mon, 04 Jun 2018 23:22:52 +0300] rev 1392
 
    - fix compiler warnings
 
    - Mon, 04 Jun 2018 23:12:40 +0300
 
    - by Teemu Piippo <teemu@hecknology.net> [Mon, 04 Jun 2018 23:12:40 +0300] rev 1391
 
    - added work done on cylinders
 
    - Wed, 30 May 2018 22:31:06 +0300
 
    - by Teemu Piippo <teemu@hecknology.net> [Wed, 30 May 2018 22:31:06 +0300] rev 1390
 
    - added draw plane feature (doesn't work with circle draw quite right yet)
 
    - Sat, 26 May 2018 17:28:15 +0300
 
    - by Teemu Piippo <teemu@hecknology.net> [Sat, 26 May 2018 17:28:15 +0300] rev 1389
 
    - refactored signal blocking
 
    - Thu, 10 May 2018 15:54:26 +0300
 
    - by Teemu Piippo <teemu@hecknology.net> [Thu, 10 May 2018 15:54:26 +0300] rev 1388
 
    - fixed that scaling factors could be negative
 
    - Thu, 10 May 2018 15:48:39 +0300
 
    - by Teemu Piippo <teemu@hecknology.net> [Thu, 10 May 2018 15:48:39 +0300] rev 1387
 
    - added a doublespinbox variant that uses "." as the decimal point and omits trailing zeros