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seleters

points on the surface of cube

in Programming Questions • 1 year 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

benja

Re: points on the surface of cube

1 year 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.

seleters

Re: points on the surface of cube

1 year ago

Thank you!

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