Processing Forum

Screen name:
kasperweiss

kasperweiss's Profile

1 Posts

0 Responses

0 Followers

Activity Trend

Last 30 days

Loading Chart...

Show:

Expanded view
List view

Kinect - closest point tracking in 3D

[0 Replies]
- 22-Mar-2013 02:53 PM
- Forum: Integration and Hardware
Hi,

I try to draw lines in 3D by tracking closest point.

Here is a code which works in 2D.

https://github.com/atduskgreg/Making-Things-See-Examples/blob/master/ex09_advanced_drawing/ex09_advanced_drawing.pde

I would like to write a 3D version of this.

However, I could not achieve it in 3D. I added closestZ, lastZ, interpolatedZ values to this sketch, but it doesn't work. Where is the problem?
2. import processing.dxf.*;
4. import SimpleOpenNI.*;
5. SimpleOpenNI kinect;
6. int closestValue;
7. int closestX;
8. int closestY;
9. int closestZ;
10. float lastX;
11. float lastY;
12. float lastZ;
14. void setup()
15. {
17. size(640, 480, P3D);
18. kinect = new SimpleOpenNI(this);
19. kinect.enableDepth();
20. // start out with a black background
21. background(0);
22. beginRaw(DXF, "output.dxf");
23. }
26. void draw()
27. {
28. closestValue = 8000;
29. kinect.update();
30. int[] depthValues = kinect.depthMap();
31. for (int y = 0; y < 480; y++) {
32. for (int x = 0; x < 640; x++) {
33. // reverse x by moving in from
34. // the right side of the image
35. int reversedX = 640-x-1;
36. // use reversedX to calculate
37. // the array index
38. int i = reversedX + y * 640;
39. int currentDepthValue = depthValues[i];
40. // only look for the closestValue within a range
42. // 610 (or 2 feet) is the minimum
43. // 1525 (or 5 feet) is the maximum
44. if (currentDepthValue > 610 && currentDepthValue < 1525
45. && currentDepthValue < closestValue) {
46. closestValue = currentDepthValue;
47. closestZ = currentDepthValue;
48. closestX = x;
49. closestY = y;
50. }
51. }
52. }
53. // "linear interpolation", i.e.
54. // smooth transition between last point
55. // and new closest point
56. float interpolatedX = lerp(lastX, closestX, 0.3f);
57. float interpolatedY = lerp(lastY, closestY, 0.3f);
58. float interpolatedZ = lerp(lastZ, closestZ, 0.3f);
59. stroke(255, 0, 0);
60. // make a thicker line, which looks nicer
61. strokeWeight(3);
63. line(lastX, lastY, lastZ, interpolatedX, interpolatedY, interpolatedZ);
65. lastX = interpolatedX;
66. lastY = interpolatedY;
67. lastZ = interpolatedZ;
68. }
70. void keyPressed() {
71. if (key == 'r'|| key == 'R') {
72. endRaw();
73. exit();
74. }
75. }

«Prev
Next »