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Topic: Newbie Problem with Rotation (Read 387 times) |
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The Public
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Newbie Problem with Rotation
« on: Dec 6th, 2004, 6:35am » |
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I'm new to P5, and I'm doing some experiments to pick up on some things. In this example, I'm trying to get rotate around a set of points plotted in 3D. The points are generated randomly by downloading random bytes from http://www.random.org/form.html to a .dat file in data. The precedent that I'm trying to work from is Casey Reas' 3D plotting of 2D image pixel data here: http://processing.org/learning/examples/extrusion.html.
Thanks in advance for any help.
This is the error I get:
java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:136)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:99)
This is the code I'm trying to run:
// Random Points 3D
boolean onetime = true;
int i=0,j=0,str=255;
// open a file and read its binary data
byte byt[] = loadBytes("RandomNumbers.dat");
int[][] bezPoints = new int[byt.length/3][3];
float angle;
void setup(){
size(305, 305);
framerate(24);
noFill();
for(i=0;i<byt.length/3;i++){
for(j=0;j<3;j++){
bezPoints[i][j] = (byt[(i*3)+j]&0xff) + 0x19;
}//end for
}//end for
}//end setup
void loop(){
background(0);
// Update and constrain the angle
angle += 0.01;
if(angle > TWO_PI) { angle = 0; }
//Rotate around center axis
translate(width/2, 0, 128 ) ;
rotateY(angle);
translate(-width/2, 0, 128 ) ;
//display points
for(i=0;i<byt.length/3;i++){
j=0;
str-=20;
if(str < 5){
str=255;
}//end if
stroke(str);
point(bezPoints[i][j], bezPoints[i][j+1], bezPoints[i][j+2]);
}//end for
}//end loop
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toxi
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Re: Newbie Problem with Rotation
« Reply #1 on: Dec 6th, 2004, 7:36pm » |
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off the top of my head it looks like your error has more to do with a scoping issue than anything else. your call to loadBytes() would be executed before actually setup() had a chance to run. this is what causes errors internally. as a rule of thumb function calls should only be made within code blocks (other functions). so a correct version of your code would start like this:
Code:byte byt[];
// plus declaration of your other variables...
void setup() {
byt=loadBytes("RandomNumbers.dat");
...
} |
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http://toxi.co.uk/
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The Public
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Re: Newbie Problem with Rotation
« Reply #2 on: Dec 9th, 2004, 11:53pm » |
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Works. Awesome. Thanks.
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