returns a rotation based on a view matrix - Android User Interface

Android examples for User Interface:View

  1. HOME
  2. Android
  3. User Interface
  4. View

Description

returns a rotation based on a view matrix

Demo Code


//package com.java2s;
import android.opengl.Matrix;

public class Main {
    /**//from   w  w  w.ja  v a 2  s .c o m
     * returns a rotation based on a view matrix
     * @param lookAt the look at pos
     * @param lookFrom the look from pos
     * @param rotX the rot x
     * @param rotY the rot y
     * @param rotZ the rot z
     * @return the rotation matrix for the cam
     */
    public static float[] getRotationViewMatrix(float[] lookAt,
            float[] lookFrom, float rotX, float rotY, float rotZ) {
        float[] rotation = new float[16];
        float[] rotationX = new float[16];
        float[] rotationY = new float[16];
        float[] rotationZ = new float[16];
        float[] newLookFrom = new float[4];
        float[] view = new float[16];
        Matrix.setIdentityM(rotation, 0);

        //rotate rotation matrix
        Matrix.setRotateM(rotationX, 0, rotX, 1, 0, 0);
        Matrix.setRotateM(rotationY, 0, rotY, 0, 1, 0);
        Matrix.setRotateM(rotationZ, 0, rotZ, 0, 0, 1);

        //put rotaions to gether
        Matrix.multiplyMM(rotation, 0, rotationX, 0, rotationY, 0);
        Matrix.multiplyMM(rotation, 0, rotation, 0, rotationZ, 0);

        Matrix.multiplyMV(newLookFrom, 0, rotation, 0, lookFrom, 0);

        newLookFrom[0] += lookAt[0];
        newLookFrom[1] += lookAt[1];
        newLookFrom[2] += lookAt[2];

        Matrix.setLookAtM(view, 0, newLookFrom[0], newLookFrom[1],
                newLookFrom[2], lookAt[0], lookAt[1], lookAt[2], 0, 0, 1);
        return view;

    }
}

Related Tutorials