Java heap space Error

DaimonW

Ciao everyone!

I am tring to have an oc-tree from pointclouds of kinect.
Problem I had, was convert the kinect.depthMapRealWorld() that is PVector array, to a Vec3D because I am usin Toxiclibs library.
Finally I have a Vec3D array with all points inside. Now I have another big problem. If I use
tree.addAll(new ArrayList(toxVecs.length));
it draw me only one cube of the octree and not all points.
Instead if i write
for (int i = 0; i < toxVecs.length-1; i++) { tree.addPoint(toxVecs[i]); }
i receive the "Java heap error"!! toxVecs [] is my array with all pointclouds inside.

• Any help?
• Do you have other approach to solve this problem?

Help me please, don't leave me alone!

Thank you,
Dam

TfGuy44

A heap error probably means that you're trying to create a lot of new objects. Like, a lot of them. And the computer just can't find the space to make them all. How many points are we talking about here?

DaimonW

Thank you @TfGuy44.
Yes i soved yet yesterday incrementing the "i" steps at i+25 it works (slowly of course).

The number of points it is about 307200.

There is another strategy for improve the number of points and performance? A guy told me about "Multithreading". It can work?

Thanks,
Dam

GoToLoop

• Depending on how many cores a computer got, multithreading can make a huge difference.
• However, only sketch's "Animation" Thread should directly draw to the main canvas.
• Others can use their own PGraphics and then having the main "Animation" Thread stamp everything into the canvas within draw().

DaimonW

thank you @GoToLoop!!

• I have i7 with 4 core (8 virtual) and gtx 560 with CUDA;
• can you give me some example please? because I didn t understand. I never used Thread until now..

GoToLoop

Disclaimer: Threading isn't for the faint of heart! :-t

• In Processing our whole sketch runs in a Thread called "Animation".
• And by default, callback draw() is invoked at about frameRate(60) FPS (~ 16ms).
• However, if the entire action takes more than that, target FPS won't be reached and get slow!
• But if we can transfer some of that burden to another Thread we might be able to speed everything up.
• Unfortunately we should avoid modifying sketch's canvas outside "Animation" Thread.
• Instead we can draw into a separate PGraphics and have the main "Animation" Thread stamp it onto the canvas later.
• In order to create a Thread, easiest way is by calling thread("") w/ the name of the function which will run by it as its String argument:
  https://processing.org/reference/thread_.html
• Basically we got draw() running at the same time as circleThread().
• Only draw() directly modifies the canvas while circleThread() got its own local PGraphics called pg.
• draw() is called back @ frameRate(1) FPS while circleThread() sleeps delay(INTERVAL) milliseconds.
• As you can see, they have 1 thing in common, a PImage variable called sharedImg!
• Once circleThread() finishes modifying its pg, it clones it w/ get() and assigns it to sharedImg.

• And b/c sharedImg is volatile, other threads can see that re-assignment ASAP.

• If you wanna get deeper into threading further, it's better you open a separate "Ask a Question".

• And Oracle got some tutorials about it here:
  http://docs.oracle.com/javase/tutorial/essential/concurrency/index.html

/**
 * PGraphics Threading (v1.0)
 * by GoToLoop (2015-May-13)
 * forum.processing.org/two/discussion/10781/java-heap-space-error
 */

static final int GAP = 50, INTERVAL = 5*1000; // 5 seconds.

volatile PImage sharedImg;

void setup() {
  size(600, 400, JAVA2D);

  smooth(4);
  frameRate(1);

  strokeWeight(3);
  stroke(-1);

  rectMode(CORNER);
  background(0);

  thread("circleThread");
  while (sharedImg == null)  delay(10);
}

void draw() {
  frame.setTitle("FrameCount: " + frameCount);

  fill((color) random(#000000));
  rect(GAP, GAP, width - GAP*2, height - GAP*2);

  image(sharedImg, 0, 0);
}

void circleThread() {
  final PGraphics pg = createGraphics(width, height, JAVA2D);

  pg.beginDraw();
  pg.smooth(4);
  pg.strokeWeight(2);
  pg.stroke(0);
  pg.ellipseMode(CENTER);

  for (;; delay(INTERVAL)) {
    pg.fill((color) random(#000000));
    pg.ellipse(width>>1, height>>1, height>>1, height>>1);
    pg.endDraw();

    sharedImg = pg.get();
  }
}

DaimonW

Wow! Thank you.

It look very hard topic. I will study your message and in case I will find some problem I will open a new topic as you suggest me.

Thank you!