1    package graphics.raytracers.rmiRaytracer.raytracer; 
2     
3    // 
4    // note: None of the methods return a vector. They will modify the current 
5    // vector object. 
6    // 
7     
8    class Vec { 
9        double x, y, z; 
10    
11       public Vec() { 
12           x = 0; 
13           y = 0; 
14           z = 0; 
15       } 
16    
17       public Vec(double ix, double iy, double iz) { 
18           x = ix; 
19           y = iy; 
20           z = iz; 
21       } 
22    
23       public Vec(Vec v) { 
24           x = v.x; 
25           y = v.y; 
26           z = v.z; 
27       } 
28    
29       public void set(double nx, double ny, double nz) { 
30           x = nx; 
31           ny = ny; 
32           z = nz; 
33       } 
34    
35       public void normalize() { 
36           double length; 
37    
38           length = Math.sqrt(x * x + y * y + z * z); 
39    
40           try { 
41               x = x / length; 
42               y = y / length; 
43               z = z / length; 
44           } catch (ArithmeticException e) { 
45               System.out.println(e.getMessage()); 
46               e.printStackTrace(); 
47           } 
48       } 
49    
50       public double dotProduct(Vec v) { 
51           return ((x * v.x + y * v.y + z * v.z)); 
52       } 
53    
54       // this = this crosses v 
55       public void crossProduct(Vec v) { 
56           double tmpx = y * v.z - z * v.y, 
57                   tmpy = z * v.x - x * v.z, 
58                   tmpz = x * v.y - y * v.x; 
59           x = tmpx; 
60           y = tmpy; 
61           z = tmpz; 
62       } 
63    
64       public void mult(double factor) { 
65           x = x * factor; 
66           y = y * factor; 
67           z = z * factor; 
68       } 
69    
70       public void add(Vec v) { 
71           x = x + v.x; 
72           y = y + v.y; 
73           z = z + v.z; 
74       } 
75    
76       // subtracts v from this vector 
77       public void sub(Vec v) { 
78           x = x - v.x; 
79           y = y - v.y; 
80           z = z - v.z; 
81       } 
82    
83       public String toString() { 
84           String res = new String("[" + x + ", " + y + ", " + z + "]"); 
85           return res; 
86       } 
87   }