Re: Any Good Core Animation Tutorials?
Re: Any Good Core Animation Tutorials?
- Subject: Re: Any Good Core Animation Tutorials?
- From: Chunk 1978 <email@hidden>
- Date: Tue, 16 Jun 2009 11:49:51 -0400
humm... ok, so CA is 3D, which means X (length), Y (height) and Z
(depth, or width), while CG is 2D so it only uses X and Y...
so if i want to only have one layer on the screen at one time, is
there still an advantage to using Z for enlargements in the 3D space
over simply scaling the image object in 2D?
also, can you explain 3x3 and 4x4?
On Tue, Jun 16, 2009 at 11:34 AM, Graham Cox<email@hidden> wrote:
>
> On 17/06/2009, at 1:27 AM, Chunk 1978 wrote:
>
>> so is CGAffineTransform considered Cocoa Animation, while
>> CATransform3D is Core Animation? but they essentially do the same
>> thing? just trying to get things straight.
>
>
> Not sure what you mean by Cocoa Animation.
>
> CGAffineTransform is a Core GRAPHICS structure, as its 'CG' prefix suggests.
> That is a strictly 2D technology, so the matrix used is 3x3. CATransform3D
> is used by Core Animation (CALayer, etc) which is a 3D technology, so the
> matrix it uses is 4x4.
>
> So they are not the same thing, though they perform the equivalent task of
> transforming co-ordinates, the first in 2 dimensions, the second in 3. In
> Core Animation, you use a CATransform3D to perform translation, scaling and
> rotation of objects in 3 dimensions.
>
> --Graham
>
>
>
>
>
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