I first 3D rotate a flat figure in Illustrator or Photoshop, get the exact angles(x, y and z) applied to it in the design tool and then apply the same angles to a UILabel placed on top of the image to synchronize them visually.
I've figured out how to rotate 2 axis at the same time by using CATransform3DConcat but then I'm not sure how to apply the third.
float angleX = -18 * M_PI / 180;
CATransform3D t1 = CATransform3DMakeRotation(angleX, 1, 0, 0);
float angleY = -26 * M_PI / 180;
CATransform3D t2 = CATransform3DMakeRotation(angleY, 0, 1, 0);
CATransform3D combo1 = CATransform3DConcat(t1, t2);
self.labelPlay.layer.transform = combo1;
EDIT
Trying this now but still no good. Tried all combinations of different orders but nothing.
float angleX = -18 * M_PI / 180;
CATransform3D t1 = CATransform3DMakeRotation(angleX, 1, 0, 0);
float angleY = -26 * M_PI / 180;
CATransform3D t2 = CATransform3DMakeRotation(angleY, 0, 1, 0);
float angleZ = 8 * M_PI / 180;
CATransform3D t3 = CATransform3DMakeRotation(angleZ, 0, 0, 1);
self.label.layer.transform = CATransform3DConcat(CATransform3DConcat(t3, t2), t1);