Java-Gaming.org Hi !
Featured games (90)
games approved by the League of Dukes
Games in Showcase (776)
Games in Android Showcase (231)
games submitted by our members
Games in WIP (856)
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  
  Camera rotation around a central pivot point?  (Read 3348 times)
0 Members and 1 Guest are viewing this topic.
Offline EliwoodL

Junior Devvie


Medals: 3
Exp: 8 years



« Posted 2013-07-10 21:23:18 »

I'm trying to use vector math to rotate the view around a central pivot point, which may move around.  This is the code that I have so far:

1  
2  
3  
4  
5  
6  
7  
8  
9  
10  
   public void followObject(Object target) {
      if (target instanceof Voxel) {
         Vector3f tpos = new Vector3f(((Voxel)target).x, ((Voxel)target).y, ((Voxel)target).z);
         pitch = Vector3f.angle(new Vector3f(1, 0, 0), tpos);
         yaw = Vector3f.angle(new Vector3f(0, 1, 0), tpos);
         roll = Vector3f.angle(new Vector3f(0, 0, 1), tpos);
         this.setPosition(tpos.x + (pitch * 10.0f * zoom), tpos.y + (yaw * 10.0f * zoom), tpos.z +(roll * 10.0f * zoom));
         GLU.gluLookAt(this.x, this.y, this.z, tpos.x, tpos.y, tpos.z, 0, 1.0f, 0);
      }
   }


Could anyone give me tips or pointers as to how I can get this to work?
Offline davedes
« Reply #1 - Posted 2013-07-10 22:38:35 »

Here is part of my Obit camera I was using in a recent LibGDX project:

1  
2  
3  
4  
5  
6  
7  
8  
9  
10  
      //the amount to "tilt" the camera vertically around origin 
      camera.position.y = tilt * TILT_SPEED;

      //orbits slowly around centre point
      camera.lookAt(0, 0, 0);
      camera.rotateAround(new Vector3(0, 0, 0), new Vector3(0, 1, 0), ORBIT_SPEED);
     
      //amount to pan up/down along the Y axis
      camera.position.add(0, panY * PAN_Y_SPEED, 0);
      camera.update();


I had tilt affected by mouse scroll, and pan affected by mouse Y drag.

See the source for LibGDX's Camera class if you want to re-invent the wheel.

Offline relminator
« Reply #2 - Posted 2013-07-11 01:18:50 »

Alternately, you could use the spherical coordinate system which is quite natural in cases like this.

No matter what method you use, be carefull about passing up as (0,1,0) since it won't work in all cases.
Pages: [1]
  ignore  |  Print  
 
 

 
hadezbladez (269 views)
2018-11-16 13:46:03

hadezbladez (146 views)
2018-11-16 13:41:33

hadezbladez (279 views)
2018-11-16 13:35:35

hadezbladez (62 views)
2018-11-16 13:32:03

EgonOlsen (2109 views)
2018-06-10 19:43:48

EgonOlsen (2141 views)
2018-06-10 19:43:44

EgonOlsen (1353 views)
2018-06-10 19:43:20

DesertCoockie (1941 views)
2018-05-13 18:23:11

nelsongames (1593 views)
2018-04-24 18:15:36

nelsongames (2241 views)
2018-04-24 18:14:32
Deployment and Packaging
by mudlee
2018-08-22 18:09:50

Java Gaming Resources
by gouessej
2018-08-22 08:19:41

Deployment and Packaging
by gouessej
2018-08-22 08:04:08

Deployment and Packaging
by gouessej
2018-08-22 08:03:45

Deployment and Packaging
by philfrei
2018-08-20 02:33:38

Deployment and Packaging
by philfrei
2018-08-20 02:29:55

Deployment and Packaging
by philfrei
2018-08-19 23:56:20

Deployment and Packaging
by philfrei
2018-08-19 23:54:46
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
Powered by MySQL Powered by PHP Powered by SMF 1.1.18 | SMF © 2013, Simple Machines | Managed by Enhanced Four Valid XHTML 1.0! Valid CSS!