Why is my 3D object alignment off?

des812

I can't figure out why these 2 rows of boxes aren't perfectly aligned to one another the way the boxes in the rows are... in other words, why is there a gap between the rows? Any help would be much appreciated. Thanks.

int dim = 50; 

void setup() {
  size(400, 200, P3D);
  background(255);
  smooth(4);
}

void draw() {
  lights();

  fill(255, 128);
  stroke(255, 128);
  ortho(0, width, 0, height); // same as ortho()

  pushMatrix();
  translate(100, 100, 0);
  rotateX(-PI/6);
  rotateY(PI/6);
  box(dim);
  translate(dim, 0, 0);
  box(dim);
  translate(dim, 0, 0);
  box(dim);
  translate(dim, 0, 0);
  box(dim);
  translate(dim, 0, 0);
  box(dim);
  popMatrix();

  pushMatrix();
  translate(100, 100+dim, 0);
  rotateX(-PI/6);
  rotateY(PI/6);
  box(dim);
  translate(dim, 0, 0);
  box(dim);
  translate(dim, 0, 0);
  box(dim);
  translate(dim, 0, 0);
  box(dim);
  translate(dim, 0, 0);
  box(dim);
  popMatrix();
}

Chrisir

Line 47 dim/2

des812

Thanks for the reply. There is no line 47 in the code so I'm not clear what you're suggesting. Can you please elaborate? Thanks.

amnon

The problem is that the 'row-moving translation' should be done after the rotation. See the adapted code. Also, you should really look into for loops. Then you can shorter your code a lot.

Adapted Code

int dim = 50;

void setup() {
  size(400, 200, P3D);
  background(255);
  smooth(4);
}

void draw() {
  lights();

  fill(255, 128);
  stroke(255, 128);
  ortho(0, width, 0, height); // same as ortho()

  pushMatrix();
  translate(100, 100, 0);
  rotateX(-PI/6);
  rotateY(PI/6);
  box(dim);
  translate(dim, 0, 0);
  box(dim);
  translate(dim, 0, 0);
  box(dim);
  translate(dim, 0, 0);
  box(dim);
  translate(dim, 0, 0);
  box(dim);
  popMatrix();

  pushMatrix();
  translate(100, 100, 0);
  rotateX(-PI/6);
  rotateY(PI/6);
  translate(0, dim, 0);
  box(dim);
  translate(dim, 0, 0);
  box(dim);
  translate(dim, 0, 0);
  box(dim);
  translate(dim, 0, 0);
  box(dim);
  translate(dim, 0, 0);
  box(dim);
  popMatrix();
}

des812

Thank you!