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358
java/src/game/util/Vector3f.java
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358
java/src/game/util/Vector3f.java
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/*
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* Copyright (c) 2002-2008 LWJGL Project
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are
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* met:
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*
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* * Neither the name of 'LWJGL' nor the names of
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* its contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
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* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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package game.util;
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import java.io.Serializable;
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import java.nio.FloatBuffer;
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/**
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*
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* Holds a 3-tuple vector.
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*
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* @author cix_foo <cix_foo@users.sourceforge.net>
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* @version $Revision$
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* $Id$
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*/
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public class Vector3f extends Vector implements Serializable {
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private static final long serialVersionUID = 1L;
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public float x, y, z;
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/**
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* Constructor for Vector3f.
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*/
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public Vector3f() {
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super();
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}
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/**
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* Constructor
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*/
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public Vector3f(Vector3f src) {
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set(src);
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}
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/**
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* Constructor
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*/
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public Vector3f(float x, float y, float z) {
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set(x, y, z);
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}
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/* (non-Javadoc)
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* @see org.lwjgl.util.vector.WritableVector2f#set(float, float)
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*/
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public void set(float x, float y) {
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this.x = x;
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this.y = y;
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}
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/* (non-Javadoc)
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* @see org.lwjgl.util.vector.WritableVector3f#set(float, float, float)
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*/
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public void set(float x, float y, float z) {
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this.x = x;
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this.y = y;
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this.z = z;
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}
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/**
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* Load from another Vector3f
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* @param src The source vector
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* @return this
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*/
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public Vector3f set(Vector3f src) {
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x = src.getX();
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y = src.getY();
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z = src.getZ();
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return this;
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}
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/**
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* @return the length squared of the vector
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*/
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public float lengthSquared() {
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return x * x + y * y + z * z;
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}
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/**
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* Translate a vector
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* @param x The translation in x
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* @param y the translation in y
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* @return this
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*/
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public Vector3f translate(float x, float y, float z) {
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this.x += x;
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this.y += y;
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this.z += z;
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return this;
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}
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/**
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* Add a vector to another vector and place the result in a destination
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* vector.
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* @param left The LHS vector
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* @param right The RHS vector
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* @param dest The destination vector, or null if a new vector is to be created
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* @return the sum of left and right in dest
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*/
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public static Vector3f add(Vector3f left, Vector3f right, Vector3f dest) {
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if (dest == null)
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return new Vector3f(left.x + right.x, left.y + right.y, left.z + right.z);
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else {
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dest.set(left.x + right.x, left.y + right.y, left.z + right.z);
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return dest;
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}
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}
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/**
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* Subtract a vector from another vector and place the result in a destination
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* vector.
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* @param left The LHS vector
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* @param right The RHS vector
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* @param dest The destination vector, or null if a new vector is to be created
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* @return left minus right in dest
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*/
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public static Vector3f sub(Vector3f left, Vector3f right, Vector3f dest) {
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if (dest == null)
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return new Vector3f(left.x - right.x, left.y - right.y, left.z - right.z);
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else {
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dest.set(left.x - right.x, left.y - right.y, left.z - right.z);
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return dest;
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}
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}
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/**
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* The cross product of two vectors.
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*
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* @param left The LHS vector
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* @param right The RHS vector
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* @param dest The destination result, or null if a new vector is to be created
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* @return left cross right
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*/
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public static Vector3f cross(
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Vector3f left,
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Vector3f right,
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Vector3f dest)
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{
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if (dest == null)
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dest = new Vector3f();
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dest.set(
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left.y * right.z - left.z * right.y,
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right.x * left.z - right.z * left.x,
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left.x * right.y - left.y * right.x
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);
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return dest;
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}
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/**
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* Negate a vector
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* @return this
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*/
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public Vector negate() {
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x = -x;
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y = -y;
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z = -z;
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return this;
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}
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/**
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* Negate a vector and place the result in a destination vector.
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* @param dest The destination vector or null if a new vector is to be created
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* @return the negated vector
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*/
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public Vector3f negate(Vector3f dest) {
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if (dest == null)
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dest = new Vector3f();
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dest.x = -x;
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dest.y = -y;
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dest.z = -z;
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return dest;
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}
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/**
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* Normalise this vector and place the result in another vector.
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* @param dest The destination vector, or null if a new vector is to be created
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* @return the normalised vector
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*/
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public Vector3f normalise(Vector3f dest) {
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float l = length();
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if (dest == null)
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dest = new Vector3f(x / l, y / l, z / l);
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else
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dest.set(x / l, y / l, z / l);
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return dest;
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}
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/**
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* The dot product of two vectors is calculated as
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* v1.x * v2.x + v1.y * v2.y + v1.z * v2.z
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* @param left The LHS vector
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* @param right The RHS vector
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* @return left dot right
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*/
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public static float dot(Vector3f left, Vector3f right) {
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return left.x * right.x + left.y * right.y + left.z * right.z;
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}
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/**
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* Calculate the angle between two vectors, in radians
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* @param a A vector
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* @param b The other vector
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* @return the angle between the two vectors, in radians
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*/
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public static float angle(Vector3f a, Vector3f b) {
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float dls = dot(a, b) / (a.length() * b.length());
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if (dls < -1f)
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dls = -1f;
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else if (dls > 1.0f)
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dls = 1.0f;
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return (float)Math.acos(dls);
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}
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/* (non-Javadoc)
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* @see org.lwjgl.vector.Vector#load(FloatBuffer)
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*/
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public Vector load(FloatBuffer buf) {
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x = buf.get();
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y = buf.get();
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z = buf.get();
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return this;
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}
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/* (non-Javadoc)
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* @see org.lwjgl.vector.Vector#scale(float)
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*/
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public Vector scale(float scale) {
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x *= scale;
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y *= scale;
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z *= scale;
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return this;
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}
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/* (non-Javadoc)
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* @see org.lwjgl.vector.Vector#store(FloatBuffer)
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*/
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public Vector store(FloatBuffer buf) {
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buf.put(x);
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buf.put(y);
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buf.put(z);
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return this;
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}
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/* (non-Javadoc)
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* @see java.lang.Object#toString()
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*/
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public String toString() {
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StringBuilder sb = new StringBuilder(64);
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sb.append("Vector3f[");
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sb.append(x);
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sb.append(", ");
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sb.append(y);
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sb.append(", ");
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sb.append(z);
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sb.append(']');
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return sb.toString();
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}
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/**
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* @return x
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*/
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public final float getX() {
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return x;
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}
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/**
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* @return y
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*/
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public final float getY() {
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return y;
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}
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/**
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* Set X
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* @param x
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*/
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public final void setX(float x) {
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this.x = x;
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}
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/**
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* Set Y
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* @param y
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*/
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public final void setY(float y) {
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this.y = y;
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}
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/**
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* Set Z
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* @param z
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*/
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public void setZ(float z) {
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this.z = z;
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}
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/* (Overrides)
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* @see org.lwjgl.vector.ReadableVector3f#getZ()
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*/
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public float getZ() {
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return z;
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}
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public boolean equals(Object obj) {
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if (this == obj) return true;
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if (obj == null) return false;
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if (getClass() != obj.getClass()) return false;
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Vector3f other = (Vector3f)obj;
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if (x == other.x && y == other.y && z == other.z) return true;
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return false;
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}
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}
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