GLModel POINTS smooth --- pointcloud --- GLGraphics

pandereto

GLModel POINTS smooth --- pointcloud --- GLGraphics

in Contributed Library Questions • 2 years ago

Hi

Im rendering a pointcloud coming from simpleopenni library. I create an arraylist of points using toxi Vec3D

And to render the arraylist, i create a GLModel
points = new GLModel(this, maxPuntos, POINTS, GLModel.STREAM);

I want to know how can i improve my render settings to get a better output (now seeems like pixelated and make a extrange effect like "moire").

But when i render the model, it looks like hard edges arround points.

For example i tried to set an smooth to render the points, but i dont see any difference
gl.glEnable(GL.GL_POINT_SMOOTH);

My goal is to get something like the house of cards pointcloud or at least i want to recognize myself in the pointcloud.

I know that this is generic cuestion, but i have spend a week trying to understand how can i improve that....but i dont find a way. Where can i find docs about that??? And i would be very happy if someone says me what im doing wrong.

Puntos is a class where i track the pointcloud

import SimpleOpenNI.*;
import toxi.geom.*;
import javax.media.opengl.*;
import codeanticode.glgraphics.*;
import remixlab.proscene.*;

Puntos pts;
int cantos = 0;
int maxPuntos = 100000;
ArrayList<Vec3D> puntosUsuarios;
GLModel points;
Scene scene;
KeyFrameInterpolator kfi;

void setup() {
size(1280, 768, GLConstants.GLGRAPHICS);
hint(ENABLE_OPENGL_2X_SMOOTH);
pts = new Puntos(this);
puntosUsuarios = new ArrayList();
ponPuntos();
//smooth();
}

void draw() {
background(0);
rotateX(radians(180));

pts.actualiza();

cantos = pts.cuantosUsers();
if (cantos>0) {
    puntosUsuarios = pts.dimePuntosUser(cantos);
}

// image(pts.todoRGB(), 160, 0, 160, 120);

///// TRABAJA CON LOS PUNTOS
GLGraphics renderer = (GLGraphics)g;
renderer.beginGL();
translate(1280/2,-300,-1000);

GL gl = renderer.gl;

if (cantos>0) {
    points.beginUpdateVertices();
    for (int p = 0;p<maxPuntos;p++)
    {
      if (p<puntosUsuarios.size())
      {
        Vec3D temp = (Vec3D)puntosUsuarios.get(p);
        points.updateVertex(p, temp.x, temp.y, temp.z);
      }
      else {
        points.updateVertex(p, 0, 0, 0);
      }
    }
    points.endUpdateVertices();

    points.beginUpdateColors();
    for (int i = 0; i < maxPuntos; i++)
    {
      if (i<puntosUsuarios.size())
      {
         points.updateColor(i,255,255,255,255);
      }else{
         points.updateColor(i, 255, 0, 0, 255);
      }
    }
    points.endUpdateColors();

}
gl.glDepthMask(false);
    points.render();
gl.glDepthMask(true);

renderer.endGL();

frame.setTitle(str(round(frameRate))+"fps");
}

void ponPuntos()
{

points = new GLModel(this, maxPuntos, POINTS, GLModel.STREAM);
points.initColors();
points.setPointSize(3);
/////////////////////////////
// Update (load) Vertex data
/////////////////////////////

points.beginUpdateVertices();
for (int i = 0; i < maxPuntos; i++)
{
    points.updateVertex(i, random(width), random(height), random(width));
}
points.endUpdateVertices();

/////////////////////////////
// Update Vertex Colour
/////////////////////////////

points.beginUpdateColors();
for (int i = 0; i < maxPuntos; i++)
{
    points.updateColor(i, 255, 255, 255, 255);
}
points.endUpdateColors();
}
void mousePressed(){
saveFrame("pantallazo.png");
}

Replies(4)

jimthree

Re: GLModel POINTS smooth --- pointcloud --- GLGraphics

2 years ago

Perhaps you could included a link to a higher resolution image so we can see what it looks like? I would suggest giving each point a bit of transparency, so it's not entirely opaque, and playing around with the GL blend modes. That would help get rid of the Moire patterns, but really the only way to increase the detail is to increase the number of points in your cloud.

Jim

pandereto

Re: GLModel POINTS smooth --- pointcloud --- GLGraphics

2 years ago

Thanks!!!!! for the link on blending, i will read this :)

Right now the code is different i dont find a way to texture each point in glgraphics with the image that comes from the rgb channel, i found a code on internet that does something similar but using "i think pure opengl" and implelemted that.

But the borders are still very hard and i get moire too.... so im really lost on that

This is what i get now

And the code im based on produces this kind of render wich looks much more better than mine

Im learning processing in tha hard way, there is no people programming with that in my city so i have to learn myself

I think that i got the basics but see that to get good "and pretty" results rendering i have to learn OpenGl..... So i dont really understand what im doing, i understand the part of setting data to buffer but in rendering im getting lost

I created two zip files, one with the processing project and other with the images

[download code]

[download images]

I could record a video too if that helps........

Thanks Jim, your are very helpfull

andres

Re: GLModel POINTS smooth --- pointcloud --- GLGraphics

2 years ago

It seems to me that the second image corresponds to a higher density point mesh... also, the object being tracked seems to be closer to the camera... but I don't have much experience with the kinect, so I might be wrong.

pandereto

Re: GLModel POINTS smooth --- pointcloud --- GLGraphics

2 years ago

Thanks for the reply andres

I have 640*480 points, so i dont know if it can be much more dense.

I made the code again using your library, trying to use point sprites. But in my desktop i have an ati card and the point sprite sample that comes with the library looks weird (in a imac looks perfect) so i bought an nvidia card to replace

If i use point sprites, i can set a texture for the point and later set the color.... its that correct, i will update the post.

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