Processing Forum

Rotating a quad in opengl HELP!

[0 Replies]
- 30-Jan-2012 08:28 PM
- Forum: Core Library Questions
Hey all, I have some code that I've been trying to make. It draws a circle on a quad and then tries to rotate it- I took some solutions from online but for some reason this stupid thing isn't rotating! Nothing changes... anyway here's my code. Can anyone take a quick gander and help out? You experts can probably spot the problem just by looking at the code...
2. import processing.opengl.*;
3. import javax.media.opengl.*;
4. import javax.media.opengl.glu.*; //...
5. import com.sun.opengl.util.texture.*;
7. Texture tex;
8. int x = 251, y = 98;
9. ArrayList ps;
10. PGraphicsOpenGL pgl;
11. GL gl;
12. GLU glu = new GLU();
14. void setup()
15. {
16. size(800,600, OPENGL);
17. try { tex=TextureIO.newTexture(new File(dataPath("ring1.png")),true); }
18. catch(Exception e) { println(e); }
19. ps = new ArrayList();
20. pgl = (PGraphicsOpenGL) g;
21. colorMode(RGB,1.0);
22. }
24. void draw()
25. {
26. background(0);
28. gl = pgl.beginGL();
31. tex.bind();
32. tex.enable();
34. gl.glMatrixMode(GL.GL_TEXTURE);
35. gl.glLoadIdentity();
36. gl.glTranslatef(0.5,0.5,0.0);
37. gl.glRotatef(PI/3,0.0,0.0,1.0);
38. gl.glTranslatef(-0.5,-0.5,0.0);
39. gl.glMatrixMode(GL.GL_MODELVIEW);
41. gl.glBegin(GL.GL_QUADS);
43. for( int i = 0 ; i < ps.size() ; ++i )
44. {
45. Particle p = (Particle) ps.get(i);
46. p.execute(gl);
47. if( !p.update() )
48. {ps.remove(i);}
49. }
53. gl.glColor4f( 0, 1, 1, .1);
54. gl.glNormal3f( 0.0f, 0.0f, 1.0f);
55. gl.glTexCoord2i(0, 0); gl.glVertex2f(0, 0);
56. gl.glTexCoord2i(1, 0); gl.glVertex2f(500, 0);
57. gl.glTexCoord2i(1, 1); gl.glVertex2f(500, 250);
58. gl.glTexCoord2i(0, 1); gl.glVertex2f(0, 250);
60. gl.glEnd();
61. tex.disable();
63. pgl.endGL();
64. }
66. void mouseClicked()
67. {
68. ps.add(new Particle(width/2, height/2, 0, tex, gl));
69. }
72. class Particle
73. {
74. PVector d_pos;
75. Texture d_tex;
76. int d_size;
77. GL d_gl;
78. color d_col;
79. float d_fade;
81. Particle( float x, float y, float z, Texture tex, GL gl)
82. {
83. d_pos = new PVector( x, y , z);
84. d_size = 100;
85. d_tex = tex;
86. d_col = color(1,1,.5);
87. d_fade = 1;
88. d_gl = gl;
89. }
91. void execute(GL gl)
92. {
93. gl.glColor4f( red(d_col), green(d_col), blue(d_col), d_fade);
94. gl.glNormal3f( 0.0f, 0.0f, 1.0f);
95. gl.glTexCoord2f(0, 0); gl.glVertex3f(d_pos.x-d_size/2, d_pos.y-d_size/2,0);
96. gl.glTexCoord2f(1, 0); gl.glVertex3f(d_pos.x + d_size/2 , d_pos.y - d_size/2,0);
97. gl.glTexCoord2f(1, 1); gl.glVertex3f(d_pos.x + d_size/2, d_pos.y + d_size/2,0);
98. gl.glTexCoord2f(0, 1); gl.glVertex3f(d_pos.x - d_size/2, d_pos.y + d_size/2,0);
99. }
101. boolean update()
102. {
103. d_fade *= .98;
104. d_pos.y-=1;
105. if( d_fade > 0.01 )
106. return true;
108. return false;
109. }
110. }

Basic 3d texture question

[6 Replies]
- 10-Jan-2012 06:47 PM
- Forum: Programming Questions
All I'm doing is calling this class's draw + update in an arraylist. The original PNG is a circle but for some reason it's being warped here as you can see. Anyone know how I can fix this? This is my first 3d project. Thanks!
2. class Particle
3. {
4. PVector d_pos;
5. PImage d_img;
6. int d_size;
7. float d_fade;
9. Particle( float x, float y, float z)
10. {
11. d_pos = new PVector( x, y , z);
12. d_img = loadImage( "ring1.png" );
13. d_size = d_img.width;
14. d_fade = 255;
15. d_size = 100;
16. }
18. void draw()
19. {
20. tint( 255, 150, 255, d_fade );
21. noStroke();
22. // image(d_img, d_pos.x - d_size/2, d_pos.y - d_size/2, d_pos.z );
24. pushMatrix();
25. translate(width / 2, height / 2);
26. rotateX(PI/3);
27. beginShape();
28. texture(d_img);
29. vertex(-d_size, -d_size, d_pos.z, 0, 0);
30. vertex(d_size, -d_size, d_pos.z, 300, 0);
31. vertex(d_size, d_size, d_pos.z, 300, 300);
32. vertex(-d_size, d_size, d_pos.z, 0, 300);
33. endShape();
34. popMatrix();
35. }
37. boolean update()
38. {
39. d_fade *= .98;
40. d_pos.z+=2;
41. if( floor( d_fade ) != 0 )
42. return true;
44. return false;
45. }
46. }

Processing with infrared webcam

[2 Replies]
- 13-Nov-2011 08:50 PM
- Forum: Integration and Hardware
Hey all, I'm trying to track things via webcam in processing, but the problem is I don't want light in the background to be tracked, only a certain object. So I bought infrared LEDs and I was wondering if there was a suggestion for a cheap webcam out there that I could convert/hack to take in infrared, then filter that data out so I can only see infrared sources.

Can anyone find anything on amazon and a short tutorial on how to seperate infrared data from regular source data?

Listening to currently playing MP3 using minim

[3 Replies]
- 30-Nov-2010 11:44 PM
- Forum: Programming Questions
I want to make a basic sketch that just graphs a waveform of the currently playing MP3 in the computer's line out. How do I do this?

I already know how to play a file and use waveform.pde to show the waveform. However, doing this would save me the torment of listening to the same music file over and over.

Thanks!

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