static NSString* prettyFloat(CGFloat f) {
    if (f == 0) {
        return @"0";
    } else if (f == 1) {
        return @"1";
    } else {
        return [NSString stringWithFormat:@"%.3f", f];
    }
}

NSString* JRNSStringFromCATransform3D(CATransform3D transform) {
    // format: [1 0 0 0; 0 1 0 0; 0 0 1 0; 0 0 0 1]

    return CATransform3DIsIdentity(transform)
        ? @"CATransform3DIdentity"
        : [NSString stringWithFormat:@"[%@ %@ %@ %@; %@ %@ %@ %@; %@ %@ %@ %@; %@ %@ %@ %@]",
           prettyFloat(transform.m11),
           prettyFloat(transform.m12),
           prettyFloat(transform.m13),
           prettyFloat(transform.m14),
           prettyFloat(transform.m21),
           prettyFloat(transform.m22),
           prettyFloat(transform.m23),
           prettyFloat(transform.m24),
           prettyFloat(transform.m31),
           prettyFloat(transform.m32),
           prettyFloat(transform.m33),
           prettyFloat(transform.m34),
           prettyFloat(transform.m41),
           prettyFloat(transform.m42),
           prettyFloat(transform.m43),
           prettyFloat(transform.m44)
           ];
}