Cheat sheet for SceneKit learning app (Objective-C)

SceneKitCheatSheet.m

// Configure the Scene View
self.sceneView.backgroundColor = [UIColor darkGrayColor];




// Create the scene
SCNScene *scene = [SCNScene scene];




// Create a camera and attach it to a node
SCNCamera *camera = [SCNCamera camera];
camera.xFov = 10;
camera.yFov = 45;

SCNNode *cameraNode = [SCNNode node];
cameraNode.camera = camera;
cameraNode.position = SCNVector3Make(0, 0, 50);
[scene.rootNode addChildNode:cameraNode]; // Place camera in the scene




// Create a cube and place it in the scene
SCNBox *cube = [SCNBox boxWithWidth:5 height:5 length:5 chamferRadius:0.0];
cube.firstMaterial.diffuse.contents = [UIColor colorWithRed:0.149 green:0.604 blue:0.859 alpha:1.000];
SCNNode *cubeNode = [SCNNode nodeWithGeometry:cube];
[scene.rootNode addChildNode:cubeNode];
self.cubeNode = cubeNode;




// Add an animation to the cube.
CAKeyframeAnimation *animation = [CAKeyframeAnimation animationWithKeyPath:@"rotation"];
animation.values = @[[NSValue valueWithSCNVector4:SCNVector4Make(1, 1, 0.3, 0 * M_PI)],
					 [NSValue valueWithSCNVector4:SCNVector4Make(1, 1, 0.3, 1 * M_PI)],
					[NSValue valueWithSCNVector4:SCNVector4Make(1, 1, 0.3, 2 * M_PI)]];
animation.duration = 5;
animation.repeatCount = HUGE_VALF;
[self.cubeNode addAnimation:animation forKey:@"rotation"];
self.cubeNode.paused = YES; // Start out paused




self.sceneView.scene = scene;


// Touch handling method implementation
UITouch *touch = [touches anyObject];
CGPoint touchPoint = [touch locationInView:self.sceneView];
SCNHitTestResult *hitTestResult = [[self.sceneView hitTest:touchPoint options:nil] firstObject];
SCNNode *hitNode = hitTestResult.node;
hitNode.paused = !hitNode.paused;