cross product vec1 x vec2 - Java java.lang

Java examples for java.lang:Math Vector

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Description

cross product vec1 x vec2

Demo Code

/**/*w  w w. j av  a 2 s. c o m*/
 * Copyright 2010 JogAmp Community. All rights reserved.
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 * Redistribution and use in source and binary forms, with or without modification, are
 * permitted provided that the following conditions are met:
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 *       provided with the distribution.
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 * FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL JogAmp Community OR
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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//package com.java2s;

public class Main {
    /**
     * cross product vec1 x vec2
     * @param v1 vector 1
     * @param v2 vector 2
     * @return the resulting vector
     */
    public static float[] crossVec3(final float[] result, final float[] v1,
            final float[] v2) {
        result[0] = v1[1] * v2[2] - v1[2] * v2[1];
        result[1] = v1[2] * v2[0] - v1[0] * v2[2];
        result[2] = v1[0] * v2[1] - v1[1] * v2[0];
        return result;
    }

    /**
     * cross product vec1 x vec2
     * @param v1 vector 1
     * @param v2 vector 2
     * @return the resulting vector
     */
    public static float[] crossVec3(final float[] r, final int r_offset,
            final float[] v1, final int v1_offset, final float[] v2,
            final int v2_offset) {
        r[0 + r_offset] = v1[1 + v1_offset] * v2[2 + v2_offset]
                - v1[2 + v1_offset] * v2[1 + v2_offset];
        r[1 + r_offset] = v1[2 + v1_offset] * v2[0 + v2_offset]
                - v1[0 + v1_offset] * v2[2 + v2_offset];
        r[2 + r_offset] = v1[0 + v1_offset] * v2[1 + v2_offset]
                - v1[1 + v1_offset] * v2[0 + v2_offset];
        return r;
    }
}

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