What's the difference between setting the zPosition of a layer vs changing it via CATransform3DTranslate

What's the difference between setting the zPosition of a layer vs changing
it via CATransform3DTranslate

References

Reference NO 1

http://stackoverflow.com/questions/13584115/whats-the-difference-between-setting-the-zposition-of-a-layer-vs-changing-it-vi

Reference NO 2

http://stackoverflow.com/questions/12994587/whats-the-relation-between-view-and-view-layer

Reference NO 3

http://stackoverflow.com/questions/10913676/why-does-a-calayers-transform3ds-m34-need-to-be-modified-before-applying-the-r

Reference NO 4

http://stackoverflow.com/questions/14839645/no-perspective-when-using-catransform3dmakerotation

Reference NO 5

http://developer.apple.com/library/ios/DOCUMENTATION/Cocoa/Conceptual/CoreAnimation_guide/CoreAnimation_guide.pdf

Reference NO 6

http://iphonedevsdk.com/forum/iphone-sdk-tutorials/21964-3d-cube-view-transition-on-iphone.html

Reference NO 7

#EANF#

Reference NO 8

#EANF#