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Programming Questions

points on the surface of cube

in Programming Questions • 10 months ago

I'm trying to create a cube made of points on the surface. This is my code:

import processing.opengl.*;

int winsize=600;
int nums = 50;
int[] q = new int[nums];
PVector qube = new PVector();
int c, s;
void setup() {

size(winsize, winsize, OPENGL);
background(0);
for (int i=0; i<nums; i++) {
q[i]=(int)(Math.random() * (5 + 1));
}

}

void draw() {
translate(200, 200);
rotateX(45);
rotateY(45);
for (int i=0; i<nums; i++) {
int side = 200;
s = (int)(Math.random() * (5 + 1));
println(s);
c = s%3;
pick(c, (s>2?1:0));
pick((c+1)%3, random(0, 1));
pick((c+2)%3, random(0, 1));
pushMatrix();
translate(qube.x*side, qube.y*side, qube.z*side);
ellipse(0, 0, 3, 3);
popMatrix();

}
}

void pick(int index, float value) {
if (index==0) {
qube.x = value;
//println("0"+" >> x");
fill(0, 0, 255);
}
else if (index==1) {
qube.y = value;
//println("1"+" >> y");
fill(255, 0, 0);
}
else if (index==2) {
qube.z = value;
//println("2"+" >> z");
fill(0, 255, 0);
}
}

I'm only getting 3 (and a half maybe) faces, maybe I'm not able to make a distributed generation with the random method? Thanks in advance.

algorithm reference: http://stackoverflow.com/questions/11815792/generation-of-3d-random-points-on-the-surface-of-a-cube

1

Replies(2)

benja

Re: points on the surface of cube

10 months ago

Hi, i think your points are ok, you just don't see all of them, because of light/camera settings.
If you pick more points(about 2000) and replace

rotateX(45);
rotateY(45);

with

background(0);
rotateX((float)frameCount/20);
rotateY((float)frameCount/20);

you should see what i mean.

Maybe it's a good idea to create the random-locations once in setup, then you could easily access them later.

Re: points on the surface of cube

10 months ago

Thank you!

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