Processing 消除三维空间上显示的二维对象中的闪烁

问题

我试图开发一个使用处理的软件。当我移动地图时，我的椭圆上会出现闪烁的效果。我怎样才能解决这个问题

代码

PImage europeMapImage;
MercatorMap mercatorMap;

PVector berlin;
PVector london;
PVector venice;
PVector istanbul;


void setup() {
  europeMapImage = loadImage("europe.jpg");
  size(900, 500, P3D);
  smooth();

  MercatorMap mercatorMap = new MercatorMap(900, 500, 68.75, 33.86, -34.71, 85.34);

  berlin = mercatorMap.getScreenLocation(new PVector(52.5, 13.34));
  london = mercatorMap.getScreenLocation(new PVector(51.5f, -0.1f));
  venice = mercatorMap.getScreenLocation(new PVector(45.44, 12.34));
  istanbul = mercatorMap.getScreenLocation(new PVector(41.01, 28.98));
}

void draw() {
  background(#000000);
  camera(mouseX, 2*mouseY, 400, width/2, height/2, 0, 0, 1, 0);
  image(europeMapImage, 0, 0, width, height);
  fill(0, 255, 200, 200);

  stroke(#ffffff, 200);
  line(berlin.x, berlin.y, venice.x, venice.y);
  noStroke();
  ellipse(berlin.x, berlin.y, 12, 12);
  ellipse(london.x, london.y, 12, 12);
  ellipse(venice.x, venice.y, 12, 12);
  ellipse(istanbul.x, istanbul .y, 12, 12);

}

在我看来，试着简单地把椭圆移到Z的更高位置

这是一个粗略的测试（未测试-z值可能为正或负）：

PImage europeMapImage;
MercatorMap mercatorMap;

PVector berlin;
PVector london;
PVector venice;
PVector istanbul;


void setup() {
  europeMapImage = loadImage("europe.jpg");
  size(900, 500, P3D);
  smooth();

  MercatorMap mercatorMap = new MercatorMap(900, 500, 68.75, 33.86, -34.71, 85.34);

  berlin = mercatorMap.getScreenLocation(new PVector(52.5, 13.34));
  london = mercatorMap.getScreenLocation(new PVector(51.5f, -0.1f));
  venice = mercatorMap.getScreenLocation(new PVector(45.44, 12.34));
  istanbul = mercatorMap.getScreenLocation(new PVector(41.01, 28.98));
}

void draw() {
  background(#000000);
  camera(mouseX, 2*mouseY, 400, width/2, height/2, 0, 0, 1, 0);
  image(europeMapImage, 0, 0, width, height);
  fill(0, 255, 200, 200);
  pushMatrix();//isolate coordinate system
  translate(0,0,10);//play with the z value to for better results
  stroke(#ffffff, 200);
  line(berlin.x, berlin.y, venice.x, venice.y);
  noStroke();
  ellipse(berlin.x, berlin.y, 12, 12);
  ellipse(london.x, london.y, 12, 12);
  ellipse(venice.x, venice.y, 12, 12);
  ellipse(istanbul.x, istanbul .y, 12, 12);
  popMatrix();//return to Processing's regular coordinate system

}