Half of my view disappear after CATransform3DRotate

Question

I have 1 view, in this view I have 1 UIImageView and UILabel, when I rotate my view half of view disappear.

This is my code

viewToAnimate is the view cointains image and label.

CATransform3D _3Dt = CATransform3DRotate(viewToAnimate.layer.transform, DEGREES_TO_RADIANS(beginValue), 0.0, 1.0, 0);
_3Dt.m34 = 1.0 / -300;

viewToAnimate.layer.transform = _3Dt;

CATransform3D _scale;

if (needZoom) {
    _scale = CATransform3DScale(viewToAnimate.layer.transform , 1+scale, 1+scale, 1+scale);

    if (_scale.m11 > 1) {
        _scale.m11 = 1;
        _scale.m22 = 1;
        _scale.m33 = 1;
    }
}
else  {
    _scale = CATransform3DScale(viewToAnimate.layer.transform , 1-scale, 1-scale, 1-scale);
}

viewToAnimate.layer.transform = _scale;
//viewToAnimate.layer.zPosition = sin(DEGREES_TO_RADIANS(beginValue)*MOSAIC_WIDTH)+1;

Answer 1

What is the value of DEGREES_TO_RADIANS? Is it by any chance M_PI/2? Your code tells that you are rotating around y-axis. See last 3 parameters in first line:

0.0, 1.0, 0

If you are supplying this then this is expected behavior - consider a plane facing you and imagine it rotate around y-axis by +/- 90 degrees, it will definitely disappear.

Answer 2

As mentioned in Diego's comment on the other answer this can be caused by zPosition issues. Make your view above all the others by setting it's zPosition to a higher value.