Java-Gaming.org Hi !
 Featured games (83) games approved by the League of Dukes Games in Showcase (522) Games in Android Showcase (127) games submitted by our members Games in WIP (590) games currently in development
 News: Read the Java Gaming Resources, or peek at the official Java tutorials
 Home Help Search Login Register
Pages: [1]
 ignore  |  Print
 Simple?? Quaternion rotation problem  (Read 3615 times) 0 Members and 1 Guest are viewing this topic.
dranonymous

Junior Devvie

Hoping to become a Java Titan someday!

 « Posted 2005-03-07 15:51:02 »

A friend and I were messing around with jME and were rotating 2 cubes.  We had different ideas on how we could do it, but got one way to work.  The other didn't and we aren't sure why.

We have an array of the geometry we want to rotate.  Below is a code snippet -

 1  2  3  4  5  6  7  8  9  10  11  12  13  14  15  16 `          Quaternion rotQuat = new Quaternion();          Quaternion localQuat = null;          float angle = 0;           if (timer.getTimePerFrame() < 1) {                angle = timer.getTimePerFrame() * 50;          }               rotQuat.fromAngleAxis(angle*FastMath.DEG_TO_RAD, new Vector3f(1, 0, 0));         for (int i = 0; i < spinList.size(); i++){               TriMesh geom = (TriMesh)spinList.get(i);               localQuat = geom.getLocalRotation();               localQuat.addLocal(rotQuat);        }`

Shouldn't this take the quat from the current object and add a small amount of rotation to it?

If we instead change 2 things: make the angle additive each time, ie angle += ....  and then do a geom.setLocalRotation(rotQuat), it works.  Of course, this means all the rotating objects are rotated at exactly the same angles, rather than whatever angles they started at.

Regards,
Dr. A>

renanse

Junior Devvie

Intelligence is light to a dark world.

 « Reply #1 - Posted 2005-03-13 01:34:28 »

FYI, this was answered on the official jME forums

Renanse  (ruh-NON-say)
dranonymous

Junior Devvie

Hoping to become a Java Titan someday!

 « Reply #2 - Posted 2005-03-16 11:38:14 »

I double checked there and don't see that anyone has responded.  My thread at the jme forum there is -

http://www.jmonkeyengine.com/jmeforum/viewtopic.php?t=1437

Thanks,
Dr. A>
 Games published by our own members! Check 'em out!
renanse

Junior Devvie

Intelligence is light to a dark world.

 « Reply #3 - Posted 2005-03-16 12:54:01 »

Oops, sorry, there was another similar thread around the same time:

http://www.jmonkeyengine.com/jmeforum/viewtopic.php?t=1424

I think you would multiply, like: localQuat = rotQuat.multiply(localQuat);

Renanse  (ruh-NON-say)
renanse

Junior Devvie

Intelligence is light to a dark world.

 « Reply #4 - Posted 2005-03-16 12:55:43 »

Looks like another poster suggests the same thing on your other thread.

Renanse  (ruh-NON-say)
Pages: [1]
 ignore  |  Print

You cannot reply to this message, because it is very, very old.

 Add your game by posting it in the WIP section, or publish it in Showcase. The first screenshot will be displayed as a thumbnail.
 trollwarrior1 (29 views) 2014-11-22 12:13:56 xFryIx (71 views) 2014-11-13 12:34:49 digdugdiggy (50 views) 2014-11-12 21:11:50 digdugdiggy (44 views) 2014-11-12 21:10:15 digdugdiggy (38 views) 2014-11-12 21:09:33 kovacsa (62 views) 2014-11-07 19:57:14 TehJavaDev (67 views) 2014-11-03 22:04:50 BurntPizza (64 views) 2014-11-03 18:54:52 moogie (80 views) 2014-11-03 06:22:04 CopyableCougar4 (80 views) 2014-11-01 23:36:41
 theagentd 28x basil_ 27x HeroesGraveDev 23x BurntPizza 21x Riven 19x Spasi 18x princec 17x KevinWorkman 13x kpars 11x SHC 11x gouessej 10x Grunnt 10x Nate 9x Longarmx 9x LiquidNitrogen 8x CopyableCougar4 8x
 Understanding relations between setOrigin, setScale and setPosition in libGdx2014-10-09 22:35:00Definite guide to supporting multiple device resolutions on Android (2014)2014-10-02 22:36:02List of Learning Resources2014-08-16 10:40:00List of Learning Resources2014-08-05 19:33:27Resources for WIP games2014-08-01 16:20:17Resources for WIP games2014-08-01 16:19:50List of Learning Resources2014-07-31 16:29:50List of Learning Resources2014-07-31 16:26:06
 java-gaming.org is not responsible for the content posted by its members, including references to external websites, and other references that may or may not have a relation with our primarily gaming and game production oriented community. inquiries and complaints can be sent via email to the info‑account of the company managing the website of java‑gaming.org