Scenekit do a spin on the Earth effect

Scenekit can use a few electrician you to complete a lot of OpenGL complex 3D Setup code, below this cat will take you to complete a rotating 3D earth scene.

First you need a picture of the Earth's surface and import it into Xcode:

We use the Scenekit built-in geometry sphere class to create an instance of the ball and apply the image of the Earth's surface to the surface of the ball:

let globe = scnsphere (radius: 15.0 ) Let Globenode = Scnnode (geometry:globe) globenode.position  = SCNVector3 (x : 20 , y : 40 , z :-50 ) globenode< Span class= "Hljs-preprocessor" >.geometry ? .firstmaterial ? .diffuse  .contents  = UIImage (named:  "earthdiffuse.jpg" ) Globenode.geometry ? .firstmaterial ? .diffuse  .mipfilter  =  

We then use the animation provided by coreanimation to rotate the sphere around its Y axis:

Let rotation = cabasicanimation (keypath:"Rotation") rotation. Fromvalue= Nsvalue (Scnvector4:scnvector4 (x:0,y:0,Z:0W:0)) rotation. Tovalue= Nsvalue (Scnvector4:scnvector4 (x:0,y:1,Z:0, W:float (m_pi*2.0)) rotation. Duration=TenRotation. RepeatCount=. InfinityGlobenode. Addanimation(Rotation, Forkey:"Rotation")

To add some funny, we move the ball up and down at the same time as it rotates, and it keeps getting bigger and smaller, which can be done using Coreanimation's Scnaction class:

Let Moveglobeup = Scnaction. Movebyx(0.0,y:10.0,Z:0.0, Duration:1.0) Let Moveglobedown = Scnaction. Movebyx(0.0,y: -10.0,Z:0.0, Duration:1.0) Let seq = scnaction. Sequence([Moveglobeup,moveglobedown]) Let Repeatseq = Scnaction. Repeatactionforever(seq) Globenode. Runaction(REPEATSEQ) Let scaleup = Scnaction. Scaleto(5.0, Duration:5.0) Let Scaledown = Scnaction. Scaleto(0.5, Duration:5.0) Let REPEATSEQ2 = Scnaction. Repeatactionforever(scnaction. Sequence([Scaledown,scaleup])) Globenode. Runaction(REPEATSEQ2)

This can be seen, cocoa about the animation of things are interlinked, in View,layer learning animation effect, it is easy to get 3D to use, very convenient, so that the cost of re-learning is very low.

Run the app, the effect is as follows (the dynamic diagram is a bit large, load please wait a moment):

You can see in the game scene not only completed the animation of the node, but also increased the effect of the ambient and transmitted light, the original need to use complex OpenGL to complete things, and now basically effortless;]

Scenekit do a spin on the Earth effect