Hi, I have this piece of code to pan and rotate around a cube, and seems to be working perfectly in P3D, but when I try to run the sketch using OPENGL, the FOV doesn't reset when I reset the perspective.

Could anybody help me with this?

This is the code:

//-----------------------------------------------


import processing.opengl.*;

float alpha1 = 10.594999;
float alpha2 = 1.1074983;
float alpha1_ = 0;
float alpha2_ = 0;
float distance = 0.4113693;
int mouse_x, mouse_y;
float translate1 = 0.6165447;
float translate2 = 0.4113693;
float translate3 = 3.977392;
float fov = 0.5;

void setup(){

 size(1200,920,P3D);

}

void draw(){

 //--------------- This should reset the settings
 
 camera();
 perspective();
 background(0);
 lights();

 //--------------- After this, the box stays static

 box(50,50,50);

 //--------------- This rotates the scene
 
 camera(width/2.0 , height/2.0, distance *(height/2.0) / tan(PI*60.0 / 360.0), width/2.0,  height/2.0, -1 * (height/2.0) / tan(PI*60.0 / 360.0), 0, 1, 0);
 perspective(fov, float(width)/float(height), distance *((height/2.0) / tan(PI*60.0/360.0))/10.0, ((height/2.0) / tan(PI*60.0/360.0))*10.0);

 translate(width/2,height/2);

 //scale(2.5);

 alpha2_ = alpha2 + sin(frameCount/130.0)*0.00008;
 alpha1_ = alpha1 + sin(frameCount/123.0)*0.00008;
 rotateX(alpha2_);
 rotateZ(alpha1_);
 translate(translate1,translate2,translate3);

 //----------------------------------------------------- After this, the cube rotates with the mouse


 box(50,50,50);
 
}


void mousePressed ()
{
 mouse_x = mouseX;
 mouse_y = mouseY;  
}

void mouseDragged()
{
 if (mouseButton == LEFT)
 {
   alpha1 +=(mouse_x - mouseX)/100.0;    
   alpha2 +=(mouse_y - mouseY)/100.0;    
 }

 if (mouseButton == RIGHT)
 {
   float msx = (mouse_x - mouseX);
   float msy = (mouse_y - mouseY)*cos(alpha2);
   float msz = (mouse_y - mouseY);
   translate1 -=(  cos(alpha1)*msx + sin(alpha1)*msy)/2.50;    
   translate2 -=( -sin(alpha1)*msx + cos(alpha1)*msy)/2.50;
   translate3 +=( sin(alpha2)*msz)/2.50;
 }

 if (mouseButton == CENTER)
 {
   fov = fov * (mouseY - mouse_y + width) / width ;    
 };

 mouse_x=mouseX;
 mouse_y=mouseY;

}

Yes, but the FOV control (dragging the middle button) doesn't work then, that's why you get a smaller cube...

It looks like FOV only can change once per draw loop, or somthing similar. It's driving me nuts!

I tried the original code that was pasted and the porblem appears to be the test for the CENTER button it doesn't seem to work. I changed it to this
Code:

  if (mouseButton == CENTER)
  {
    fov = fov * (mouseY - mouse_y + width) / width ;  
    println("FOV "+fov);  
  }
 

but when I tried it nothing was displayed. Change CENTER to LEFT and the FOV changes.

Putting this line in the mouse event handlers showed that the centre mouse button events were not detected at least on my computer.

Code:

   println("Mouse " + mouseButton);