 self.scnView = [[SCNView alloc]initWithFrame:self.view.bounds];
 self.scnView.backgroundColor = [UIColor blackColor];
 self.scnView.scene = [SCNScene scene];
 [self.view addSubview:self.scnView];

设置物理世界执行时间

    // 设置物理世界执行的速度
self.scnView.scene.physicsWorld.speed = 5;

添加照相机

SCNCamera *camera = [SCNCamera camera];
SCNNode *cameraNode = [SCNNode node];
cameraNode.camera = camera;
cameraNode.position = SCNVector3Make(0, 10, 10);
// 调整照相机的角度
cameraNode.rotation = SCNVector4Make(1, 0, 0, -M_PI/8.0);
[self.scnView.scene.rootNode addChildNode:cameraNode];

添加地板

SCNFloor *floor = [SCNFloor floor];
floor.firstMaterial.diffuse.contents = @"floor-frames.jpg";
SCNNode *floorNode = [SCNNode nodeWithGeometry:floor];
[self.scnView.scene.rootNode addChildNode:floorNode];
floorNode.physicsBody = [SCNPhysicsBody staticBody];

添加一个聚焦灯光

 SCNNode *lightNode = [SCNNode node];
lightNode.light = [SCNLight light];
lightNode.light.type = SCNLightTypeSpot;
lightNode.position = SCNVector3Make(0, 100, 0);
lightNode.rotation = SCNVector4Make(1, 0, 0, -M_PI/2.0);
[self.scnView.scene.rootNode addChildNode:lightNode];

添加文字

[self.scnView.scene.rootNode addChildNode:[self createTextNode:@"酷"]];
[self.scnView.scene.rootNode addChildNode:[self createTextNode:@"走"]];
[self.scnView.scene.rootNode addChildNode:[self createTextNode:@"天"]];
[self.scnView.scene.rootNode addChildNode:[self createTextNode:@"涯"]];

[self.scnView.scene.rootNode addChildNode:[self createTextNode:@"酷"]];
[self.scnView.scene.rootNode addChildNode:[self createTextNode:@"走"]];
[self.scnView.scene.rootNode addChildNode:[self createTextNode:@"天"]];
[self.scnView.scene.rootNode addChildNode:[self createTextNode:@"涯"]];

下面是创建文字节点的代码

[self.scnView.scene.rootNode addChildNode:[self createTextNode:@"酷"]];
[self.scnView.scene.rootNode addChildNode:[self createTextNode:@"走"]];
[self.scnView.scene.rootNode addChildNode:[self createTextNode:@"天"]];
[self.scnView.scene.rootNode addChildNode:[self createTextNode:@"涯"]];

[self.scnView.scene.rootNode addChildNode:[self createTextNode:@"酷"]];
[self.scnView.scene.rootNode addChildNode:[self createTextNode:@"走"]];
[self.scnView.scene.rootNode addChildNode:[self createTextNode:@"天"]];
[self.scnView.scene.rootNode addChildNode:[self createTextNode:@"涯"]];