3d Box vertices

General Discussion Other

koenigs

in General Discussion • Other • 1 year ago

Hi,

Is there a way to access the location of the vertices of a box?

If I place a box in somewhere in 3d space (using the built in box(float,float,float)), I need to know where each of the vertices are in reference to the origin.

Replies(3)

amnon.owed

Re: 3d Box vertices

1 year ago

You can't access the vertices of a box. However you can figure out where they are. See below the example for a uniform box. For non-uniform boxes you need to adapt the code a bit, but you get the general idea.

Code Example

import processing.opengl.*;
void setup() {
size(500, 500, OPENGL);
noFill();
}
void draw() {
background(255);
translate(width/2, height/2);
rotateX(frameCount*0.02);
rotateZ(frameCount*0.02);
box(200);
drawBoxVertices(200);
}
void drawBoxVertices(float boxSize) {
float hbz = boxSize/2;
strokeWeight(25);
pushMatrix();
scale(hbz);
beginShape(POINTS);
vertex(-1, 1, 1);
vertex( 1, 1, 1);
vertex(-1,-1, 1);
vertex( 1,-1, 1);
vertex(-1, 1,-1);
vertex( 1, 1,-1);
vertex(-1,-1,-1);
vertex( 1,-1,-1);
endShape();
popMatrix();
strokeWeight(1);
}

sillyexam..

Re: 3d Box vertices

1 year ago

So far as I know box(float,float,float) is just a drawing function like line or rect.

It's not an object which is stored in memory which you can access.

However it is really simple to get around.

If you define a class as follows and store your boxes as objects

import processing.opengl.*;
myBox b;
void setup(){
size(800, 600, OPENGL);
b=new myBox(200,200,200,50,50,50);
}
void draw(){
background(0);
fill(255);
b.move_me(mouseX-b.x,mouseY-b.y,0);
b.rotate_me(.05,.04,.03);
b.display();
}
public class myBox{
float x;
float y;
float z;
float w;
float h;
float d;
float rx=0;
float ry=0;
float rz=0;
myBox(int ix, int iy, int iz, int iw, int ih, int id){
x=ix;
y=iy;
z=iz;
w=iw;
h=ih;
d=id;
}
public void display(){
translate(x, y, z);
rotateY(rx);
rotateY(ry);
rotateY(rz);
box(w, h, d);
}
public void move_me(float ix,float iy,float iz){
x+=ix;
y+=iy;
z+=iz;
}
public void rotate_me(float ix,float iy,float iz){
rx+=ix;
ry+=iy;
rz+=iz;
}
public void resize_me(float iw,float ih,float id){
w+=iw;
h+=ih;
d+=id;
}
}

koenigs

Re: Re: 3d Box vertices

1 year ago

Thanks for the quick responses.

I was thinking of the boxes as objects.

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