enabling depth sort causes extreme lag...

someDude

Hey guys, I am currently trying to make a mc skin editor (yeah kill me). I know that processing is just for small sketchest but I am srsly to lazy to learn anything about OpenGL. Anyway, I will porbably use some transparent elements and therefore it would be noice to have a hint(ENABLE_DEPTH_SORT);

The thing is that I am hardly getting 2fps when I use depth sort. I mean I did not imagine 6x6=36 squares with opacity to slow down the program so badly...

Ik I did not post any code here but is there anything I should know about the depth sort thing or does anybody know anything about this problem?

Thx in advance som dude

nabr

you should post an MCVE anyway.

void setup() {
  size(920, 540, P3D);
  noStroke();
}
float angle=0.;
void draw() {

  // 
  // hint(ENABLE_DEPTH_SORT);

  background(255);
  directionalLight(51, 102, 126, 0, 0, -1);

  // cubes semi transparent 
  for (int i = 0; i < 100; i++) {
    pushMatrix();
    fill(255, 255, 255, 155);
    translate(width/2, (i*50), -50*i ); 
    rotateX(angle);
    rotateY(angle);
    box(50);
    popMatrix();
  }

  // red cube
  blendMode(NORMAL);
  pushMatrix();
  fill(255, 0, 0, 255);
  translate(width/2, height/2);
  rotateY(angle);   
  rotateX(angle);
  box(100);
  popMatrix();

  angle=frameCount*.01f;

  if (frameCount % 30 == 0) println(frameRate);
}

someDude

@nabr mhhh... I forgot about some spheres I placed in the middle of each block. since they are made of a whole lot of triangles they may cause problems in combination with depth sort...

Chrisir

Look at sphereDetail in the reference for the spheres

Chrisir

General question: what’s the purpose of hint(ENABLE_DEPTH_SORT);? I thought P3D would sort the objects correctly in 3D space by default anyway?

someDude

@Chrisir well if you work with opacity just drawing the top elements is not enough, some have to be drawn first and some later

i think this should show it nicely, just the other way around xD

nabr

@someDude

Okay, i understand now, i out of time "on vacation".

Make sure you optimize your code.

Here is the Low Level implementation of Alpha Blending without ENABLE_DEPTH_SORT (i already was preparing, and then you posted your pics)

Maybe you find a tutorial, and can fix it be your self. Would be the best :)
like here http://www.alecjacobson.com/weblog/?p=2750

import com.jogamp.opengl.GL;
import com.jogamp.opengl.GL2ES2; 
PShape s;

PJOGL pgl;
GL2ES2 gl;

void setup() {
  size(856, 580, P3D);
  //50.000 verts  ~3.3Mb
  s=loadShape("https://"+"raw.githubusercontent.com/tolkanabroski/coding/master/stuff/models/happybuddha.obj");
  s.scale(15);
  // s.rotateX(PI);
}

void draw() {
  pgl = (PJOGL) beginPGL();
  gl = pgl.gl.getGL2ES2();

  gl.glClearDepth( 1.0f );
  gl.glEnable( GL.GL_DEPTH_TEST );
  gl.glDepthFunc( GL.GL_LEQUAL );

  // background(0);
  // JOGL equivalent
  gl.glClearColor(0.0f, 0.0f, 0.0f, 1.0f);
  gl.glClear(GL.GL_COLOR_BUFFER_BIT | GL.GL_DEPTH_BUFFER_BIT);

  directionalLight( 253, 184, 19, 0, 0, -1);

  // blendMode(ADD);
  // JOGL equivalent
  gl.glEnable(GL.GL_CULL_FACE ); // for obj - works with processing primitives
  // BACK_FACE (default) 
  gl.glEnable(GL.GL_BLEND);
  gl.glBlendFunc(GL.GL_SRC_ALPHA, GL.GL_ONE); 



  translate(width*.5f, height*.5f);
  rotateY(frameCount*.01f);

  for (float i = 0.; i <=TWO_PI; i += PI/20.0) {
    pushMatrix();
    translate(cos(i)*250.f, sin(i)*250.f);
    rotateX(frameCount*.01f);
    shape(s);
    popMatrix();
  }
  if (frameCount % 30 == 0) println(frameRate);

  endPGL();
}

some links

• deph test
• Dude explains detph test
• Dude implementing Depth Peeling i find it interesting i leave it here
• Dude talking about optimization

Maybe you can also post that simpel Cube example you posted as pic. Would help for debug.

Chrisir

Thanks!