CATransform3DMakeRotation and shadow

I'm creating the flip animation library.

In two words, I create the CALayer a开发者_StackOverflow社区nd rotate it using CoreAnimation's CATransform3DMakeRotation.

The question is – is there a way to add a shadow to that scene? Without rewriting the whole code with OpenGL :)

Have a look at CAGradientLayer. I am currently using it to add shadows in a similar situation. May be costly performance-wise (still have to check that), but looks quite convincing.

Add CAGradientLayer as sublayer(s) to your layers and animate its opacity. You may have to play around a little with the gradient stops and colors to get them right.

I am not sure about OpenGL but have you checked CATransform3D

Add

#define DEGREES_TO_RADIANS(d) (d * M_PI / 180)

in .pch file

CATransform3D myTransform = CATransform3DIdentity;
myTransform.m34 = 1.0 / -500;
myTransform = CATransform3DRotate(myTransform, DEGREES_TO_RADIANS(90), 0.0f, 0.0f, 1.0f);
myView.layer.transform = myTransform;

you can go on changing the angle here DEGREES_TO_RADIANS(90)

Here you can add shadow to myView.