public Matrix4f zero() {
        m00 = m01 = m02 = m03 = 0.0f;
        m10 = m11 = m12 = m13 = 0.0f;
        m20 = m21 = m22 = m23 = 0.0f;
        m30 = m31 = m32 = m33 = 0.0f;
        return this;
    }
Sets all elements to zero.

@return the (modified) current instance (for chaining)
jme3-core/src/main/java/com/jme3/math/Matrix4f.java