Hi all,

I have a problem controlling the camera. My objective is simply to orbit the object of interest using cursor keys.

Code:

/* starting camera coordinates */
float z = 500;
float x = 100;
float y = 100;

float theta = PI/3;

void setup(){
 size(512,512,P3D); 
 camera(x,y,z,  0,0,0,  0,-1,0); // init camera
}

void draw(){
 background(50);
 
 pushMatrix();
   box(100,100,100);
 popMatrix();

}

void keyPressed() {
    if(key == CODED) {
    if (keyCode == UP){
	y = (y * cos(theta)) - (x * sin(theta));
    }
    if (keyCode == DOWN){
	     y = (y * cos(theta)) + (x * sin(theta));
    }
    if (keyCode == LEFT){
		x = (x * cos(theta)) - (y * sin(theta));
    }
    if (keyCode == RIGHT){
		x = (x * cos(theta)) + (y * sin(theta));
    }
    
  camera(x,y,z,  0,0,0,  0,-1,0); // reposition camera
  }

}
 

.. the above does not work as desired, and I would really appreciate (read: desperately need) some guidance with this :(

Thank you for your time,

some help for OPENGL....

Code :
 //-----------------------------------------------------
 import processing.opengl.*;
 import javax.media.opengl.*;

 float cameraX = 0,cameraY=0,cameraZ=0,targetX=0,targetY=0,targetZ=0,N_cameraX=0,N_cameraY=1,N_ca
meraZ=0;
 float cameraAlpha = 150/*30*/, cameraBeta= 150/*30*/;
 float cameraRadius = 200;
 Debug debug;

 void setup(){
   size(800,800,OPENGL);
   background(0);
   PGraphicsOpenGL pgl = (PGraphicsOpenGL) g;
   debug = new Debug(pgl);
  }


 void draw(){
   background(0);
   PGraphicsOpenGL pgl = (PGraphicsOpenGL) g;
   GL gl = pgl.gl;
   debug.show(pgl);
   camera();
   cameraMove();
   camera( cameraX, cameraY, cameraZ,  0.0, 0.0, 0.0, 0.0, -1.0, 0.0);
   lights();
   sphere(40);
 }


 void cameraMove(){
   cameraX = cameraRadius * cos(radians(cameraAlpha))*cos(radians(cameraBeta));
   cameraY = cameraRadius * sin(radians(cameraAlpha));  
   cameraZ = cameraRadius *cos(radians(cameraAlpha)) *sin(radians(cameraBeta));

  if (cameraY > 0 && cameraY< cameraRadius) {
    N_cameraX= 0;//-cameraX;
    N_cameraY = -cameraY ;//-cameraY + cameraRadius/cameraY;
    N_cameraZ = 0;//-cameraZ;
  }

  println("cameraX = " + cameraX);
  println("cameraY = " + cameraY);
  println("cameraZ = " + cameraZ);
  println("NcameraX = " + N_cameraX);
  println("NcameraY = " + N_cameraY);
  println("NcameraZ = " + N_cameraZ);
}

 void keyPressed(){
   if (keyCode == DOWN) cameraAlpha -= 1;
   if (keyCode == UP) cameraAlpha += 1;
   if (keyCode == LEFT) cameraBeta -= 1;
   if (keyCode== RIGHT) cameraBeta += 1;
   if (key == 'z') cameraRadius -=1;
   if (key == 'Z') cameraRadius +=1;

   if(key == 'r' || key == 'R'){
     cameraX = 0;
     cameraY=0;
     cameraZ=0;
     targetX=0;
     targetY=0;
     targetZ=0;
     N_cameraX=0;
     N_cameraY=1;
     N_cameraZ=0;
     cameraAlpha = 30;
     cameraBeta=30;
     cameraRadius = 20;
 }  
}


 void mouseDragged(){
  if(mouseButton == RIGHT){
      cameraX -= (pmouseX-mouseX)/2;
      cameraY -= (pmouseY-mouseY)/2;
      targetX -= (pmouseX-mouseX)/2;
      targetY -= (pmouseY-mouseY)/2;
  }
 
   if(mouseButton == LEFT){
     cameraAlpha -= pmouseY - mouseY;
     cameraBeta += pmouseX - mouseX;
  }
 
}



 public class Debug  {
   
   public void show(PGraphicsOpenGL pgl) {
       draw_axes(pgl);
   }
   public Debug(PGraphicsOpenGL pgl) {
       
   }
   
 
   public void draw_axes (PGraphicsOpenGL pgl){
     GL gl;
     gl = pgl.beginGL();  
     gl.glPushMatrix();
     gl.glColor3f(0.,255.,0.);
     gl.glBegin(GL.GL_LINES);
     gl.glVertex3f(0, 0, 0);
     gl.glVertex3f(250, 0, 0);
     gl.glEnd();
     gl.glColor3f(255.,0.,0.);
     gl.glBegin(GL.GL_LINES);
     gl.glVertex3f(0, 250, 0);
     gl.glVertex3f(0, 0, 0);
     gl.glEnd();
     gl.glColor3f(0.,0.,255.);
     gl.glBegin(GL.GL_LINES);
     gl.glVertex3f(0, 0, 250);
     gl.glVertex3f(0, 0, 0);
     gl.glEnd();
     gl.glPopMatrix();
     pgl.endGL();  
 
  }
 }