public Matrix4f transposeLocal() {
        float tmp = m01;
        m01 = m10;
        m10 = tmp;

        tmp = m02;
        m02 = m20;
        m20 = tmp;

        tmp = m03;
        m03 = m30;
        m30 = tmp;

        tmp = m12;
        m12 = m21;
        m21 = tmp;

        tmp = m13;
        m13 = m31;
        m31 = tmp;

        tmp = m23;
        m23 = m32;
        m32 = tmp;

        return this;
    }
Transpose in place.

@return this (transposed)
jme3-core/src/main/java/com/jme3/math/Matrix4f.java