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#import “ViewController.h”
@import SceneKit;
@interface ViewController ()
@property (nonatomic, weak) SCNView *sceneView;
@property (nonatomic, weak) SCNScene *scene;
@end
@implementation ViewController
– (void)viewDidLoad {
[super viewDidLoad];
self.view.backgroundColor = [UIColor colorWithHue:0.3 saturation:0.3 brightness:0.7 alpha:1];
[self setupScene];
[self createGround];
[self createBall];
[self createSlingShot];
[self createCamera];
[self createLight];
}
– (void)setupScene
{
float w = CGRectGetMaxX(self.view.bounds);
SCNView *sceneView = [[SCNView alloc] initWithFrame:CGRectMake(0, 0, w, w)];
sceneView.backgroundColor = [UIColor colorWithHue:0.7 saturation:0.1 brightness:1 alpha:1];
sceneView.center = CGPointMake(CGRectGetMidX(self.view.bounds), CGRectGetMidY(self.view.bounds));
sceneView.scene = [SCNScene scene];
[self.view addSubview:sceneView];
self.scene = sceneView.scene;
self.sceneView = sceneView;
}
– (void)createSlingShot
{
UIColor *color = [UIColor colorWithHue:0.4 saturation:0.6 brightness:1 alpha:1];
SCNCylinder *handle = [SCNCylinder cylinderWithRadius:0.4 height:4];
handle.firstMaterial.diffuse.contents = color;
SCNNode *handleNode = [SCNNode nodeWithGeometry:handle];
handleNode.position = SCNVector3Make(0, 0, 0);
[self.scene.rootNode addChildNode:handleNode];
for (int i=0; i<2; i++) {
SCNCylinder *bar = [SCNCylinder cylinderWithRadius:0.4 height:3];
bar.firstMaterial.diffuse.contents = color;
SCNNode *barNode = [SCNNode nodeWithGeometry:bar];
if (i == 0) {
barNode.transform = SCNMatrix4Rotate(barNode.transform, M_PI/4.0, 0, 0, 1);
barNode.transform = SCNMatrix4Translate(barNode.transform, –1, 2, 0);
} else {
barNode.transform = SCNMatrix4Rotate(barNode.transform, –M_PI/4.0, 0, 0, 1);
barNode.transform = SCNMatrix4Translate(barNode.transform, 1, 2, 0);
}
[self.scene.rootNode addChildNode:barNode];
}
}
– (void)createGround
{
SCNTorus *torus = [SCNTorus torusWithRingRadius:18 pipeRadius:8];
torus.firstMaterial.diffuse.contents = [UIColor colorWithHue:0.5 saturation:0.4 brightness:1 alpha:1];
SCNNode *ground = [SCNNode nodeWithGeometry:torus];
ground.name = @”ground”;
ground.position = SCNVector3Make(0, –10, –60);
ground.physicsBody = [SCNPhysicsBody staticBody];
ground.physicsBody.physicsShape = [SCNPhysicsShape shapeWithGeometry:ground.geometry options:nil];
[self.scene.rootNode addChildNode:ground];
}
– (void)createBall
{
SCNSphere *ball = [SCNSphere sphereWithRadius:1];
ball.firstMaterial.diffuse.contents = [UIColor colorWithHue:0 saturation:0.7 brightness:1 alpha:1];
SCNNode *ballNode = [SCNNode nodeWithGeometry:ball];
ballNode.name = @”ball”;
ballNode.position = SCNVector3Make(0, 4, 0);
[self.scene.rootNode addChildNode:ballNode];
}
– (void)createCamera
{
SCNNode *camera = [SCNNode node];
camera.camera = [SCNCamera camera];
camera.position = SCNVector3Make(0, 20, 20);
camera.constraints = @[[SCNLookAtConstraint lookAtConstraintWithTarget:[self.scene.rootNode childNodeWithName:@”ground” recursively:NO]]];
[self.scene.rootNode addChildNode:camera];
}
– (void)createLight
{
SCNLight *light = [SCNLight light];
light.type = SCNLightTypeOmni;
SCNNode *lightNode = [SCNNode node];
lightNode.light = light;
lightNode.position = SCNVector3Make(0, 10, 50);
[self.scene.rootNode addChildNode:lightNode];
}
– (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{
SCNNode *ball = [self.scene.rootNode childNodeWithName:@”ball” recursively:NO];
ball.physicsBody = nil;
}
– (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event
{
CGPoint p = [[touches anyObject] locationInView:self.sceneView];
SCNVector3 o = [self.sceneView projectPoint:SCNVector3Zero];
SCNVector3 vector = [self.sceneView unprojectPoint:SCNVector3Make(p.x, p.y, o.z)];
SCNVector3 newVector = SCNVector3Make(vector.x, vector.y, o.z – vector.y + 1);
SCNNode *ball = [self.scene.rootNode childNodeWithName:@”ball” recursively:NO];
ball.position = newVector;
}
– (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event
{
SCNNode *ball = [self.scene.rootNode childNodeWithName:@”ball” recursively:NO];
ball.physicsBody = [SCNPhysicsBody dynamicBody];
ball.physicsBody.physicsShape = [SCNPhysicsShape shapeWithGeometry:ball.geometry options:nil];
[ball.physicsBody applyForce:SCNVector3Make(-5.0 * ball.position.x, –15.0 * ball.position.y, –10.0 * ball.position.z) impulse:YES];
}
– (void)didReceiveMemoryWarning {
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
@end