content: package edu.stanford.rsl.tutorial.phantoms;
  
  /**
   * Simple class to show the Grid2D functionality. We use a Grid2D to create a uniform circle.
   * We use this as a first phantom to investigate parallel beam projection and back-projection.
   * 
   * @author Recopra Summer Semester 2012
   *
   */
  public class Sphere3D extends Phantom3D {
  
  	/**
  	 * The constructor takes two arguments to initialize the grid. The circles will be in the center and have a random radius and position.
  	 * @param x
  	 * @param y
  	 */
  	public Sphere3D (int x, int y,int z){
  		super(x,y,z,"Sphere3D");
  
  		double radius = 0.45 * x;
  		int xcenter = x / 2;
  		int ycenter = y / 2;
  		int zcenter = z / 2;
  		float val = 1.f;
  
  		for (int i = 0; i < x; i++) {
  			for (int j = 0; j < y; j++) {
  				for (int k = 0; k < z; ++k){
  				if (Math.pow(i - xcenter, 2) + Math.pow(j - ycenter, 2) + Math.pow(k - zcenter,2) <= (radius * radius)) {
  					super.setAtIndex(i, j, k,val);
  				}
  			}
  		}
  		}		
  
  	}
  	
  }
  
  /*
   * Copyright (C) 2010-2014 Andreas Maier
   * CONRAD is developed as an Open Source project under the GNU General Public License (GPL).
  */