Builds a 18 meter high tree with random green leaves

tree18m.js

// tree18m.js
// Creates a single tree of 1 meter voxels to about 18 meters high with various shades of green leaves
// Created by Adrian on 4 July 2014
// Copyright 2014 Adrian McCarlie
// Released under Creative Commons By Attribution Share Alike, feel free to modify and share.
// 
//
// Change these 3 values to suit the planting site of the tree.
// 
var X_POS = 100;
var Y_POS = 100;
var Z_POS = 100;

//Change the height variable here to change the height of the trunk from the ground to the bottom of the leaves.
//Does not change the size of the leaves.
var height = 10;
//
///////////////////End of User Variables
// 
		var x = X_POS;
		var y = Y_POS + height;
		var z = Z_POS;
		var l = 0;
		var maxl = 2;
		var halfh = 5;
		var h = 0;
		var w = 0;
		var maxw = 2;
		var leaves = 0;
		var width = 3;
		var start = 0;
		var col = 0; 
		
	function rezTree()	
	{
		while (h < halfh) //create leaf stacks to half the height
		{    
			while (width < maxw) //create columns
			{
				while (leaves < width) //create rows of leaves
				{ 
					col = Math.floor((Math.random() * 130) + 100);//generates a random shade of green
					Voxels.setVoxel(x, y+h, z+start, 1, 40, col, 40); z++; leaves++; //rows getting bigger
				}
				x++; 
				leaves = 0;
				width = width + 2;
				z = Z_POS;
				start=start-1;
			}
////////////////////////////////////////////////////////	stop getting bigger start getting smaller horizontally		
			width = width - 4;
			start=start + 2	;	
			while (width >= 0)
			{			
				while (leaves < width) 
				{
					col = Math.floor((Math.random() * 130) + 100);
					Voxels.setVoxel(x, y+h, z+start, 1, 40, col, 40); z++; leaves++;//rows getting smaller
				}
				x++; 
				leaves = 0;
				width = width - 2;
				z = Z_POS;
				start=start+1	;					
			}
			h++;
			maxw = maxw + 2;
			x = X_POS  - h;
			
		}	
			/////////////////////////////////////////////////////////////////////	half way from the bottom up start getting smaller
			var q = -4; 
			x = x  +2;
			width = 1;
			start = start - 1;
			maxw = maxw - 2;
		while (h < (halfh *2)-1)//create stack for second half height

		{    
			while (width < maxw)
			{
				while (leaves < width) 
				{
					col = Math.floor((Math.random() * 130) + 100);
					Voxels.setVoxel(x, y+h, z+start, 1, 40, col, 40); z++; leaves++; //rows getting bigger
				}
				x++; 
				leaves = 0;
				width = width + 2;
				z = Z_POS;
				start=start-1;
			}		
			width = width - 4;
			start=start+2	;	
			while (width >= 0)
			{			
				while (leaves < width) 
				{
					col = Math.floor((Math.random() * 130) + 100);
					Voxels.setVoxel(x, y+h, z+start, 1, 40, col, 40); z++; leaves++; //rows getting smaller
				}
				x++; 
				leaves = 0;
				width = width - 2;
				z = Z_POS;
				start=start+1	;					
			}
			h++;
			maxw = maxw - 2;
			q++;
			x = X_POS  + q;
			
		}
		x= X_POS+1;
		y = Y_POS;
		z= Z_POS+1;		
			while (y <= Y_POS + height)//build a post 10 high
			{
				Voxels.setVoxel(x, y, z, 1, 100, 80, 10); y++;
			}
			Voxels.setVoxel(x-1, y, z-1, 1, 100, 80, 10); //4 single brown voxels to branch the trunk nicely into the foliage
			Voxels.setVoxel(x-1, y, z+1, 1, 100, 80, 10); 
			Voxels.setVoxel(x+1, y, z+1, 1, 100, 80, 10); 
			Voxels.setVoxel(x+1, y, z-1, 1, 100, 80, 10); 

	Script.stop();
	}

	rezTree();