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sphere + translate (Read 1216 times)
nije
sphere + translate
Nov 7th, 2008, 1:28pm  
hey!
I'm trying to make a grid of spheres. if a change the sphere to rect they all tile perfect but when i'm using the sphere it doesn't even look like a grid..the difference is that i don't have to use the translate command, and think it's the one messing all up..
i've created a class,

class Sphere{
float xCor;
float yCor;
float zCor;
Sphere(float xCor, float yCor, float zCor, int id){
    this.xCor = xCor;
    this.yCor = yCor;
    this.zCor = zCor;
    this.id = id;
  }
  void show(){
    translate(xCor,yCor,zCor);
    sphere(rad);
  }    
}
from main:
//init
for(int i=0; i<arrSize; i++){
   for(int j=0; j<arrSize; j++){
     Sphere s = new Ball(xCor,yCor,zCor,id);
     id++;
     sphereArr[i][j] = s;
     xCor+=50;
   }
   xCor=0;
   yCor+=50;
}  
void draw(){
for(int k=0; k<arrSize; k++){
   for(int l=0; l<arrSize; l++){
      sphereArr[k][l].show();
   }
 }
}

can anyone see what i have done wrong?
Regards
_n


}
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Stephen
Re: sphere + translate
Reply #1 - Nov 7th, 2008, 3:32pm  
Hi,

It's slightly difficult to diagnose with complete code, but it sounds like pushMatrix() and popMatrix() before and after translate commands might help?

import processing.opengl.*;

// Very slow on my machine if the number of items is large
int numItems = 10;
int row, col;

void setup()
{
 size(800, 800, OPENGL);
 row = width/numItems;
 col = height/numItems;
}

void draw()
{
 background(255);
 lights();
 fill(255, 0, 0);  
 noStroke();
 for(int r = row*2; r < width - row; r+=row)
 {
   for(int c = col*2; c < height - col; c+=row)
   {
     pushMatrix();
     translate(r, c);
     // These rotates aren't required but are a nice effect
     // the order they appear in relation to translate and push/pop
     // is important
     //rotateX(radians(frameCount));
     //rotateY(radians(frameCount));
     //rotateZ(radians(frameCount));      
     // Try box for an alternative layout
     //box(row/2);
     sphere(row/2);
     popMatrix();
   }
 }
}
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