I am currently working on my first simple particle thing in 3D which get createt through 2D ellipses or images. My problem is that if you rotate the camera, you see that the particles are actually 2D.
In my mind I thought I could simply fix that issue by turning each particle kinda like with the camera so that they always face the camera.

I unfortunately failed due to my bad understanding of math and angles in general. Can anybody help me out?

some code:

PImage b;

int countParticles = 0;
int maxParticles = 100;
Particles[] particle;

void setup(){
 size(screen.width,screen.height, OPENGL);
 hint(ENABLE_OPENGL_4X_SMOOTH);
 hint(DISABLE_ERROR_REPORT);
 frameRate(30);
 colorMode(RGB,255,255,255,100);
 smooth();
 b = loadImage("test.png");
 particle  = new Particles[maxParticles];
}

void draw(){
 background(#000000);
 translate(0, 0, -1000);
 if(countParticles < maxParticles){
 particle[countParticles] = new Particles(countParticles);
 countParticles++;
 }
 for (int i=0; i<countParticles; i++){
 particle[i].render();
 }
 myCamera();
}

void myCamera(){
 float fov = mouseX/float(width) * PI/2;
 float cameraY = height/2.0;
 float cameraZ = cameraY / tan(fov / 2.0);
 beginCamera();
 perspective(fov, float(width) / float(height),cameraZ/10.0 , cameraZ*10.0);
 rotateX(radians(0.5));
 endCamera();
}

class Particles {
  int id;
  float mySize = 30.0;
  float myAlpha = 0;
  float _t= random(width);
 
  Particles(int sentID){
    id = sentID;
  }
 
  void render(){
   float t= (frameCount/200.0)+_t;
   float x=noise(t)*width;
   float y=noise(t,1)*height;
   float z=noise(t,1,2)*width*3;
   float thisAlpha;
   if(myAlpha < 100){
   myAlpha = myAlpha + 1;
   thisAlpha = myAlpha;
   }
   pushMatrix();
   tint(#f1248e, thisAlpha);
   translate(x,y,z);
   rotateX(-radians(0.5));
   image(b, round(-mySize/2.0), round(-mySize/2.0) , mySize, mySize);
   popMatrix();
  }

}


as you can see I rotate the camera X radians(0.5) each frame. I hoped rotating each particle -radians(0.5) would be enough but it didnt work at all. I simply need a point to start from since I am really stuck with this one.