Define a projection matrix in terms of a field of view angle, an aspect ratio, and z clip planes - Android User Interface

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Description

Define a projection matrix in terms of a field of view angle, an aspect ratio, and z clip planes

Demo Code


//package com.java2s;

public class Main {
    /**/*from  ww w  .  j a va 2  s.  c o  m*/
     * Define a projection matrix in terms of a field of view angle, an aspect ratio, and z clip planes
     *
     * @param m the float array that holds the perspective matrix
     * @param offset the offset into float array m where the perspective matrix data is written
     * @param fovy field of view in y direction, in degrees
     * @param aspect width to height aspect ratio of the viewport
     * @param zNear Z for clip pane
     * @param zFar Z for far pane
     */
    public static void perspectiveM(final float[] m, final int offset,
            final float fovy, final float aspect, final float zNear,
            final float zFar) {
        //android.util.Log.d(TAG,"perspectiveM()");
        final float f = 1.0f / (float) Math.tan(fovy * (Math.PI / 360.0));
        final float rangeReciprocal = 1.0f / (zNear - zFar);

        m[offset + 0] = f / aspect;
        m[offset + 1] = 0.0f;
        m[offset + 2] = 0.0f;
        m[offset + 3] = 0.0f;

        m[offset + 4] = 0.0f;
        m[offset + 5] = f;
        m[offset + 6] = 0.0f;
        m[offset + 7] = 0.0f;

        m[offset + 8] = 0.0f;
        m[offset + 9] = 0.0f;
        m[offset + 10] = (zFar + zNear) * rangeReciprocal;
        m[offset + 11] = -1.0f;

        m[offset + 12] = 0.0f;
        m[offset + 13] = 0.0f;
        m[offset + 14] = 2.0f * zFar * zNear * rangeReciprocal;
        m[offset + 15] = 0.0f;
    }
}

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