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i have some problem...sos

[1 Reply]
- 12-Aug-2012 12:29 AM
- Forum: Contributed Library Questions
i use to openkinect library example.

but i have some problem..

---source

// Daniel Shiffman

// Kinect Point Cloud example

// http://www.shiffman.net

// https://github.com/shiffman/libfreenect/tree/master/wrappers/java/processing

import org.openkinect.*;

import org.openkinect.processing.*;

// Kinect Library object

Kinect kinect;

float a = 0;

// Size of kinect image

int w = 640;

int h = 480;

// We'll use a lookup table so that we don't have to repeat the math over and over

float[] depthLookUp = new float[2048];

void setup() {

size(800,600,P3D);

kinect = new Kinect(this);

kinect.start();

kinect.enableDepth(true);

// We don't need the grayscale image in this example

// so this makes it more efficient

kinect.processDepthImage(false);

// Lookup table for all possible depth values (0 - 2047)

for (int i = 0; i < depthLookUp.length; i++) {

depthLookUp[i] = rawDepthToMeters(i);

}

}

void draw() {

background(0);

fill(255);

textMode(SCREEN);

text("Kinect FR: " + (int)kinect.getDepthFPS() + "\nProcessing FR: " + (int)frameRate,10,16);

// Get the raw depth as array of integers

int[] depth = kinect.getRawDepth();

// We're just going to calculate and draw every 4th pixel (equivalent of 160x120)

int skip = 4;

// Translate and rotate

translate(width/2,height/2,-50);

rotateY(a);

for(int x=0; x<w; x+=skip) {

for(int y=0; y<h; y+=skip) {

int offset = x+y*w;

// Convert kinect data to world xyz coordinate

int rawDepth = depth[offset];

PVector v = depthToWorld(x,y,rawDepth);

stroke(255);

pushMatrix();

// Scale up by 200

float factor = 200;

translate(v.x*factor,v.y*factor,factor-v.z*factor);

// Draw a point

point(0,0);

popMatrix();

}

}

// Rotate

a += 0.015f;

}

// These functions come from: http://graphics.stanford.edu/~mdfisher/Kinect.html

float rawDepthToMeters(int depthValue) {

if (depthValue < 2047) {

return (float)(1.0 / ((double)(depthValue) * -0.0030711016 + 3.3309495161));

}

return 0.0f;

}

PVector depthToWorld(int x, int y, int depthValue) {

final double fx_d = 1.0 / 5.9421434211923247e+02;

final double fy_d = 1.0 / 5.9104053696870778e+02;

final double cx_d = 3.3930780975300314e+02;

final double cy_d = 2.4273913761751615e+02;

PVector result = new PVector();

double depth = depthLookUp[depthValue];//rawDepthToMeters(depthValue);

result.x = (float)((x - cx_d) * depth * fx_d);

result.y = (float)((y - cy_d) * depth * fy_d);

result.z = (float)(depth);

return result;

}

void stop() {

kinect.quit();

super.stop();

}

------

i get a error..

detected : kinect.enableDepth(true);

Exception in thread "Animation Thread" java.lang.NullPointerException

at org.openkinect.processing.Kinect.enableDepth(Kinect.java:84)

at PointCloud.setup(PointCloud.java:48)

at processing.core.PApplet.handleDraw(PApplet.java:1583)

at processing.core.PApplet.run(PApplet.java:1503)

at java.lang.Thread.run(Thread.java:680)

-----

what's problem..

sorry i didn't well english. =(

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