1    package graphics.raytracers.tracer.geometry; 
2     
3    final public class Vector3d { 
4        private double x, y, z; 
5     
6        public Vector3d(double a, double b, double c) { 
7            x = a; 
8            y = b; 
9            z = c; 
10       } 
11    
12       public Vector3d(Vector3d a) { 
13           x = a.x; 
14           y = a.y; 
15           z = a.z; 
16       } 
17    
18       public Vector3d() { 
19           x = 0.0; 
20           y = 0.0; 
21           z = 0.0; 
22       } 
23    
24       public static Vector3d add(Vector3d a, Vector3d b) { 
25           return new Vector3d(a.x + b.x, a.y + b.y, a.z + b.z); 
26       } 
27    
28       public static Vector3d adds(double s, Vector3d a, Vector3d b) { 
29           return new Vector3d(s * a.x + b.x, s * a.y + b.y, s * a.z + b.z); 
30       } 
31    
32       public static Vector3d sub(Vector3d a, Vector3d b) { 
33           return new Vector3d(a.x - b.x, a.y - b.y, a.z - b.z); 
34       } 
35    
36       public static Vector3d mult(Vector3d a, Vector3d b) { 
37           return new Vector3d(a.x * b.x, a.y * b.y, a.z * b.z); 
38       } 
39    
40       public static Vector3d cross(Vector3d a, Vector3d b) { 
41           return 
42                   new Vector3d(a.y * b.z - a.z * b.y, 
43                           a.z * b.x - a.x * b.z, 
44                           a.x * b.y - a.y * b.x); 
45       } 
46    
47       public static double dot(Vector3d a, Vector3d b) { 
48           return a.x * b.x + a.y * b.y + a.z * b.z; 
49       } 
50    
51       public static Vector3d comb(double a, Vector3d A, double b, Vector3d B) { 
52           return 
53                   new Vector3d(a * A.x + b * B.x, 
54                           a * A.y + b * B.y, 
55                           a * A.z + b * B.z); 
56       } 
57    
58       public void scale(double t) { 
59           x *= t; 
60           y *= t; 
61           z *= t; 
62       } 
63    
64       public void negate() { 
65           x = -x; 
66           y = -y; 
67           z = -z; 
68       } 
69    
70       public double normalize() { 
71           double len; 
72           len = Math.sqrt(x * x + y * y + z * z); 
73           if (len > 0.0) { 
74               x /= len; 
75               y /= len; 
76               z /= len; 
77           } 
78           return len; 
79       } 
80    
81       public String toString() { 
82           return "<" + x + "," + y + "," + z + ">"; 
83       } 
84    
85       public double getX() { 
86           return x; 
87       } 
88    
89       public void setX(double x) { 
90           this.x = x; 
91       } 
92    
93       public double getY() { 
94           return y; 
95       } 
96    
97       public void setY(double y) { 
98           this.y = y; 
99       } 
100   
101      public double getZ() { 
102          return z; 
103      } 
104   
105      public void setZ(double z) { 
106          this.z = z; 
107      } 
108  } 
109