2 * $RCSfile: Vector3f.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 single-precision floating point
38 * x,y,z coordinates. If this value represents a normal, then it should
42 public class Vector3f extends Tuple3f implements java.io.Serializable {
44 // Combatible with 1.1
45 static final long serialVersionUID = -7031930069184524614L;
48 * Constructs and initializes a Vector3f 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 Vector3f(float x, float y, float z)
60 * Constructs and initializes a Vector3f from the array of length 3.
61 * @param v the array of length 3 containing xyz in order
63 public Vector3f(float[] v)
70 * Constructs and initializes a Vector3f from the specified Vector3f.
71 * @param v1 the Vector3f containing the initialization x y z data
73 public Vector3f(Vector3f v1)
80 * Constructs and initializes a Vector3f from the specified Vector3d.
81 * @param v1 the Vector3d containing the initialization x y z data
83 public Vector3f(Vector3d v1)
90 * Constructs and initializes a Vector3f from the specified Tuple3f.
91 * @param t1 the Tuple3f containing the initialization x y z data
93 public Vector3f(Tuple3f t1) {
99 * Constructs and initializes a Vector3f from the specified Tuple3d.
100 * @param t1 the Tuple3d containing the initialization x y z data
102 public Vector3f(Tuple3d t1) {
108 * Constructs and initializes a Vector3f to (0,0,0).
117 * Returns the squared length of this vector.
118 * @return the squared length of this vector
120 public final float lengthSquared()
122 return (this.x*this.x + this.y*this.y + this.z*this.z);
126 * Returns the length of this vector.
127 * @return the length of this vector
129 public final float length()
132 Math.sqrt(this.x*this.x + this.y*this.y + this.z*this.z);
137 * Sets this vector to be the vector cross product of vectors v1 and v2.
138 * @param v1 the first vector
139 * @param v2 the second vector
141 public final void cross(Vector3f v1, Vector3f v2)
145 x = v1.y*v2.z - v1.z*v2.y;
146 y = v2.x*v1.z - v2.z*v1.x;
147 this.z = v1.x*v2.y - v1.y*v2.x;
153 * Computes the dot product of this vector and vector v1.
154 * @param v1 the other vector
155 * @return the dot product of this vector and v1
157 public final float dot(Vector3f v1)
159 return (this.x*v1.x + this.y*v1.y + this.z*v1.z);
163 * Sets the value of this vector to the normalization of vector v1.
164 * @param v1 the un-normalized vector
166 public final void normalize(Vector3f v1)
170 norm = (float) (1.0/Math.sqrt(v1.x*v1.x + v1.y*v1.y + v1.z*v1.z));
177 * Normalizes this vector in place.
179 public final void normalize()
184 (1.0/Math.sqrt(this.x*this.x + this.y*this.y + this.z*this.z));
192 * Returns the angle in radians between this vector and the vector
193 * parameter; the return value is constrained to the range [0,PI].
194 * @param v1 the other vector
195 * @return the angle in radians in the range [0,PI]
197 public final float angle(Vector3f v1)
199 double vDot = this.dot(v1) / ( this.length()*v1.length() );
200 if( vDot < -1.0) vDot = -1.0;
201 if( vDot > 1.0) vDot = 1.0;
202 return((float) (Math.acos( vDot )));