Java-Gaming.org Hi !
 Featured games (83) games approved by the League of Dukes Games in Showcase (581) Games in Android Showcase (162) games submitted by our members Games in WIP (632) games currently in development
 News: Read the Java Gaming Resources, or peek at the official Java tutorials
Pages: [1]
 ignore  |  Print
 LWJGL Object Coordinates  (Read 1309 times) 0 Members and 1 Guest are viewing this topic.
lethalwire

Senior Newbie

 « Posted 2012-04-24 03:09:02 »

I'm trying to get the object coordinates of objects I'm drawing in 3D space.
I've read that the GL_MODELVIEW_MATRIX is the comprised of the GL_PROJECTION_MATRIX and the transformation_matrix(which isn't defined for lwjgl).

So, are the object coordinates simply in the matrix:
transformation_matrix = GL_PROJECTION_MATRIX * inverse(GL_MODELVIEW_MATRIX);

Also...
If I'm letting the user move the camera around freely in the 3D space, do I have to add anything to the computation when I'm solving for the transformation_matrix?

I've already read that this ISN'T the way it should be done, and that I should be keeping track of any x,y and z coordinates myself. (As this isn't what OpenGL was meant for)
In that case, what method would I use to keep track of x,y and z coordinates if I'm consistently doing something similar to:

glTranslatef(x, y, z);
glRotatef(degree, 0, 1, 0); //Where there could, or could NOT be a rotation
glRotatef(degree, 1, 0, 0);//Where there could, or could NOT be a rotation
glTranslatef(x, y, z);
...
etc.
lethalwire

Senior Newbie

 « Reply #1 - Posted 2012-04-24 06:39:23 »

I think I might've figured it out...

=)
* lethalwire puts away the coffee.
Pages: [1]
 ignore  |  Print

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

 MrMapcom (9 views) 2015-05-23 20:26:16 MrMapcom (9 views) 2015-05-23 20:23:34 Waterwolf (28 views) 2015-05-20 15:01:45 chrislo27 (34 views) 2015-05-20 03:42:21 BurntPizza (69 views) 2015-05-10 15:53:18 FrozenShade (55 views) 2015-05-07 09:11:21 TheLopais (216 views) 2015-05-06 13:36:48 TheLopais (200 views) 2015-05-06 13:35:14 TheLopais (206 views) 2015-05-06 13:33:39 TheLopais (226 views) 2015-05-06 13:32:48
 Spasi 32x BurntPizza 16x DavidBVal 12x ra4king 12x Riven 12x EgonOlsen 11x theagentd 11x Husk 10x KevinWorkman 9x princec 8x scanevaro 8x opiop65 7x KaiHH 7x revers 6x HeroesGraveDev 5x MrPork 5x
 List of Learning Resources2015-05-05 10:20:32How to: JGO Wikiby Mac702015-02-17 20:56:162D Dynamic Lighting2015-01-01 20:25:42How do I start Java Game Development?by gouessej2014-12-27 19:41:21Resources for WIP gamesby kpars2014-12-18 10:26:14Understanding 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 10:40:00
 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