I just started to translate some sketches from 2d to 3d and was wondering why transparency only works when looking from one side. I thought maybe it has something to do with using a camera or lightsources. dont know how all this works yet... So is it more useful to move the cam instead of the objects like i did? Anything i have to take care of when using lightsources or cams etc. ?

here is a sketch where you can see the transparency problem. maybe its easy to explain using this example.

Thanks!

import processing.opengl.*;
void setup(){
 size(600,600,OPENGL);

}
float rx,ry;
void draw(){
 lights();
rx+=((width/2-mouseX)*0.01f-rx)*0.1f;
 ry+=((height/2-mouseY)*0.01f-ry)*0.1f;
 rotateY(rx);
 rotateX(ry);

 randomSeed(10);
 background(241);
  noStroke();
 smooth();
 translate(width/2,height/2);
 segment(260 ,0,1600,10);


}
void segment(int resolution,int start, int end, int radius){
 beginShape(QUAD_STRIP);
 for(int i=0;i<resolution;i++){
   float d=radians(map(i,0,resolution-1,start,end));
  fill(map(i,0,resolution,0,255));
float xx = random(1.2,6.5);

  float lerpX = map(xx,1.2,6.5,0,1);
//   fill(lerpColor(#ff0000,#4400ff,lerpX),100);
  fill(255-xx*170,20);

  strokeWeight(0.4);
  stroke(lerpColor(#ff0000,#4400ff,lerpX),100);
   vertex(sin(d)*(radius+i),cos(d)*(radius+i), i*4);
   vertex(sin(d)*((radius*xx)+i),cos(d)*((radius*xx)+i), i*4);
 }
 endShape();
}