Main.java Source code

Introduction

Here is the source code for Main.java

Source

//package com.java2s;

public class Main {
    public static void setLookAtM(float[] rm, float eyeX, float eyeY, float eyeZ, float centerX, float centerY,
            float centerZ, float upX, float upY, float upZ) {

        float fx = centerX - eyeX;
        float fy = centerY - eyeY;
        float fz = centerZ - eyeZ;

        float rlf = 1.0f / length(fx, fy, fz);
        fx *= rlf;
        fy *= rlf;
        fz *= rlf;

        float sx = fy * upZ - fz * upY;
        float sy = fz * upX - fx * upZ;
        float sz = fx * upY - fy * upX;

        float rls = 1.0f / length(sx, sy, sz);
        sx *= rls;
        sy *= rls;
        sz *= rls;

        float ux = sy * fz - sz * fy;
        float uy = sz * fx - sx * fz;
        float uz = sx * fy - sy * fx;

        rm[0] = sx;
        rm[1] = ux;
        rm[2] = -fx;
        rm[3] = 0.0f;

        rm[4] = sy;
        rm[5] = uy;
        rm[6] = -fy;
        rm[7] = 0.0f;

        rm[8] = sz;
        rm[9] = uz;
        rm[10] = -fz;
        rm[11] = 0.0f;

        rm[12] = 0.0f;
        rm[13] = 0.0f;
        rm[14] = 0.0f;
        rm[15] = 1.0f;

        translateM(rm, -eyeX, -eyeY, -eyeZ);
    }

    /**
     * Computes the length of a vector.
     *
     * @param x x coordinate of a vector
     * @param y y coordinate of a vector
     * @param z z coordinate of a vector
     * @return the length of a vector
     */
    public static float length(float x, float y, float z) {
        return (float) Math.sqrt(x * x + y * y + z * z);
    }

    public static void translateM(float[] m, float x, float y, float z) {
        for (int i = 0; i < 4; i++) {
            m[12 + i] += m[i] * x + m[4 + i] * y + m[8 + i] * z;
        }
    }
}