2008 04 01Core Animation Starfield
It looks better when moving ! :)
After learning that core animation doesn't like a root layer with a perspective transform, this sample sets up the perspective transform on a container layer, and stores the CATextLayer layers there. Works pretty well this time !
This uses preferredFrameSize to set the CATextLayer bounds, animates zPosition with CABasicAnimation and opacity with CAKeyframeAnimation to get a smooth transition from invisible, visible, invisible.
Coordinates
As we're going 3d, we don't work with (x,y) beetween ([0…frame width], [0 … frame height]) but with centered coordinates : [-width…width, -height…height]. This means our container layer needs to be centered in the view, or the 3d objects will appear to spring from the bottom left corner.
Issues
- hit testing a layer doesn't work reliably.
- the main layer is manually centered. Couldn't wrap my head around constraints.
- how do you use Cocoa controls on a HUD window ? They don't look that good …
CoreAnimationStarfield.zipCore Animation
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CoreAnimationStarfield.zip
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Woops ! Maybe I should have Bloom disabled by default. But it's so much prettier ... :)
Nice code!
Runs like a dog on Macbook (1st gen) until you turn bloom filter off. Then runs really smoothly.
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