2 * $RCSfile: Vector3d.java,v $
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28 * $Date: 2008/02/28 20:18:51 $
32 package javax.vecmath;
34 import java.lang.Math;
37 * A 3-element vector that is represented by double-precision floating point
38 * x,y,z coordinates. If this value represents a normal, then it should
42 public class Vector3d extends Tuple3d implements java.io.Serializable {
44 // Combatible with 1.1
45 static final long serialVersionUID = 3761969948420550442L;
48 * Constructs and initializes a Vector3d from the specified xyz coordinates.
49 * @param x the x coordinate
50 * @param y the y coordinate
51 * @param z the z coordinate
53 public Vector3d(double x, double y, double z)
60 * Constructs and initializes a Vector3d from the array of length 3.
61 * @param v the array of length 3 containing xyz in order
63 public Vector3d(double[] v)
70 * Constructs and initializes a Vector3d from the specified Vector3d.
71 * @param v1 the Vector3d containing the initialization x y z data
73 public Vector3d(Vector3d v1)
80 * Constructs and initializes a Vector3d from the specified Vector3f.
81 * @param v1 the Vector3f containing the initialization x y z data
83 public Vector3d(Vector3f v1)
90 * Constructs and initializes a Vector3d from the specified Tuple3f.
91 * @param t1 the Tuple3f containing the initialization x y z data
93 public Vector3d(Tuple3f t1)
100 * Constructs and initializes a Vector3d from the specified Tuple3d.
101 * @param t1 the Tuple3d containing the initialization x y z data
103 public Vector3d(Tuple3d t1)
110 * Constructs and initializes a Vector3d to (0,0,0).
119 * Sets this vector to the vector cross product of vectors v1 and v2.
120 * @param v1 the first vector
121 * @param v2 the second vector
123 public final void cross(Vector3d v1, Vector3d v2)
127 x = v1.y*v2.z - v1.z*v2.y;
128 y = v2.x*v1.z - v2.z*v1.x;
129 this.z = v1.x*v2.y - v1.y*v2.x;
136 * Sets the value of this vector to the normalization of vector v1.
137 * @param v1 the un-normalized vector
139 public final void normalize(Vector3d v1)
143 norm = 1.0/Math.sqrt(v1.x*v1.x + v1.y*v1.y + v1.z*v1.z);
151 * Normalizes this vector in place.
153 public final void normalize()
157 norm = 1.0/Math.sqrt(this.x*this.x + this.y*this.y + this.z*this.z);
165 * Returns the dot product of this vector and vector v1.
166 * @param v1 the other vector
167 * @return the dot product of this and v1
169 public final double dot(Vector3d v1)
171 return (this.x*v1.x + this.y*v1.y + this.z*v1.z);
176 * Returns the squared length of this vector.
177 * @return the squared length of this vector
179 public final double lengthSquared()
181 return (this.x*this.x + this.y*this.y + this.z*this.z);
186 * Returns the length of this vector.
187 * @return the length of this vector
189 public final double length()
191 return Math.sqrt(this.x*this.x + this.y*this.y + this.z*this.z);
196 * Returns the angle in radians between this vector and the vector
197 * parameter; the return value is constrained to the range [0,PI].
198 * @param v1 the other vector
199 * @return the angle in radians in the range [0,PI]
201 public final double angle(Vector3d v1)
203 double vDot = this.dot(v1) / ( this.length()*v1.length() );
204 if( vDot < -1.0) vDot = -1.0;
205 if( vDot > 1.0) vDot = 1.0;
206 return((double) (Math.acos( vDot )));