public Matrix3f set(float[] matrix) {
        return set(matrix, true);
    }
Copies all 9 elements from the array argument, in row-major order.

@param matrix the input array (not null, length=9, unaffected)
@return the (modified) current instance (for chaining)
@throws IllegalArgumentException if the array has length != 9
jme3-core/src/main/java/com/jme3/math/Matrix3f.java