Hi folks. I'm looking for a library or better  to import data from bvh files (motion capture files). I know someone wrote one a couple years ago but it's not working (called MotionData, I think) It's broken and I can't peak under the hood to repair or make it work with my files.

Does anyone experimented with bvh files in processing ?

Thanks !

Maybe it's just a newbie error, but here's the error message I get when I try to load my bvh file with the moD_demo.pde provided by Xer (http://processing.org/discourse/yabb_beta/YaBB.cgi?board=os_libraries_tools;action=display;num=1164867108;start=7#7)

Code:

java.lang.ArrayIndexOutOfBoundsException: 8

at BVH.ImportData(BVH.java:920)

at MotionData.<init>(MotionData.java:30)

at Temporary_9553_4774.setup(Temporary_9553_4774.java:37)

at processing.core.PApplet.handleDisplay(PApplet.java:1384)

at processing.core.PGraphics.requestDisplay(PGraphics.java:690)

at processing.core.PApplet.run(PApplet.java:1556)

at java.lang.Thread.run(Thread.java:613)

java.lang.ArrayIndexOutOfBoundsException: 8

at BVH.ImportData(BVH.java:920)

at MotionData.<init>(MotionData.java:30)

at Temporary_9553_4774.setup(Temporary_9553_4774.java:37)

at processing.core.PApplet.handleDisplay(PApplet.java:1384)

at processing.core.PGraphics.requestDisplay(PGraphics.java:690)

at processing.core.PApplet.run(PApplet.java:1556)

at java.lang.Thread.run(Thread.java:613)
 

Here's the source code of moD_Demo.pde:

Code:

import processing.opengl.*;
MotionData motion_data; // <==================== Add MoD library

int NumOfSegs;
int NumOfFrames;
int FrameRate;
static final int _W=1; // joint width
static final int _F=100; // joint scaler
static final int _NUM_FILES=1;
static final int _START_FILE=1;
double [][][]p0;
double [][][]p1;
boolean [][]isEP;
int f;

void setup()
{
  String []filename=new String [_NUM_FILES];
  int i;

    // init frame number
  f=0;
  
  // set filenames list
//
// I'm not using this loop to load the bvh files.
//
 /* for(i=0;i<_NUM_FILES;i++)
  {
    if((i+_START_FILE)<10)
	filename[i]= "//bvh\\motion0"+(i+_START_FILE)+".bvh";
    else
	filename[i]= "C:\\bvh\\motion"+(i+_START_FILE)+".bvh";
 
    System.out.println(filename[i]);
  }*/
//
// Instead I put my url in the first position of the array. Is that what causes
// the error ? Doesn't seem so.
//
  filename[0] = "azumi.bvh";
  
  // startup a class
  MotionData motion_data = new MotionData(filename);

  // get info
  NumOfSegs = motion_data.GetNumberOfSegments();
  NumOfFrames = motion_data.GetNumberOfFrames();
  FrameRate = motion_data.GetFrameRate();

  System.out.println("Number of Segments ="+NumOfSegs);
  System.out.println("Number of Frames ="+NumOfFrames);
  System.out.println("Number of FrameRate ="+FrameRate);
 
  // set frame rate
  frameRate(FrameRate);
  
  // setup joint data
  p0 = new double [NumOfFrames][NumOfSegs][3];
  p1 = new double [NumOfFrames][NumOfSegs][3];
  isEP = new boolean [NumOfFrames][NumOfSegs];
  
  for(f=0; f<NumOfFrames; f++)
    motion_data.GetFrameObject(p0[f], p1[f], isEP[f], f);
  
  // smooth out the motion  
  motion_data.FilterObject(p0,p1,NumOfSegs,NumOfFrames);

  System.out.println("===========================");

  size(1024, 768, OPENGL);
  noStroke();
}

void draw()
{
  double vx,vy,vz;
  translate(width/2, height/2);

  // color of joints 
  fill(0, 0, 0);
  background(200);
  
  // render the frame
  if(f==NumOfFrames) f=0;
  for(int i=0; i<NumOfSegs; i++)
  {
     beginShape(QUADS);
	 vx = _F*p0[f][i][0]; vy = _F*p0[f][i][1]-_W; vz = _F*p0[f][i][2];
	 vertex((float)vx,(float)-vy,(float)vz);
	 vx = _F*p0[f][i][0]; vy = _F*p0[f][i][1]+_W; vz = _F*p0[f][i][2];
	 vertex((float)vx,(float)-vy,(float)vz);
	 vx = _F*p1[f][i][0]; vy = _F*p1[f][i][1]+_W; vz = _F*p1[f][i][2];
	 vertex((float)vx,(float)-vy,(float)vz);
	 vx = _F*p1[f][i][0]; vy = _F*p1[f][i][1]-_W; vz = _F*p1[f][i][2];
	 vertex((float)vx,(float)-vy,(float)vz);
    endShape();
    beginShape(QUADS);
	 vx = _F*p0[f][i][0]-_W; vy = _F*p0[f][i][1]; vz = _F*p0[f][i][2];
	 vertex((float)vx,(float)-vy,(float)vz);
	 vx = _F*p0[f][i][0]+_W; vy = _F*p0[f][i][1]; vz = _F*p0[f][i][2];
	 vertex((float)vx,(float)-vy,(float)vz);
	 vx = _F*p1[f][i][0]+_W; vy = _F*p1[f][i][1]; vz = _F*p1[f][i][2];
	 vertex((float)vx,(float)-vy,(float)vz);
	 vx = _F*p1[f][i][0]-_W; vy = _F*p1[f][i][1]; vz = _F*p1[f][i][2];
	 vertex((float)vx,(float)-vy,(float)vz);
    endShape();
 }
 
 // update the next frame number
 f++;
} 

Finally, here's the bvh file I'm trying to load. It's a pretty long bvh file. http://www.glockenspiel.ca/transfert/azumi.bvh

Also, when I load the pde file, it automatically open an untitled sketch with it. Am I missing some files with it ?

Do you have a working example I could perhaps take a look at ?

Yes indeed, it seems to problem is with my bvh file. I tried the e-motek example and it's doing fine. I'll look into my bvh file to see what's wrong, thanks !