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// Load two scenes
SCNScene *mainScene = [SCNScene sceneNmaed:@"level.dae"];
SCNScene *characterScene = [SCNScene sceneNamed:@"monkey.dae"];

// Get the monkey
SCNNode *monkey = [characterScene.rootNode childNodeWithName:@"monkey" recursively:YES];

// Add a monkey to the level
[mainScene.rootNode addChildNode:monkey];

// Add another monkey to the level
[mainScene.rootNode addChildeNode:[monkey clone]];

// Load an animation
CAAnimation *anim = [sceneSource entryWithIdentifier:animationName withClass:[CAAnimation class]];

// Play it
[character addAnimation:anim forKey:@"run"];

// Be notified through delegation
- (void)physicsWorld:(SCNPhysicsWorld *)world
     didBeginContact:(SCNPhysicsContact *)contact;

// Or explicitly perform ray tests
- (NSArray *)rayTestWithSegmentFromPoint:(SCNVector3)origin
                                 toPoint:(SCNVector3)dest
                                 options:(NSDictionary *)options;

// Animating items
[aBanana runAction:
  [SCNAction repeatActionForever:
    [SCNAction rotateByX:0.0 y:2.0 * M_PI z:0.0 duration:2.0]]];

// Load a particle system
SCNParticleSystem *particleSystem =
  [SCNParticleSystem particleSystemNamed:@"dust.scnp"
                             inDirectory:@"art.scnassets/particles"];

// Attach to a node
[character addparticleSystem:particleSystem];

// Control emission
particleSystem.birthRate = shouldEmit ? aBirthRate : 0;

NSString *modifier = @"_geometry.texcoords[0] +=
vec2(
    sin(_geometry.position.z + u_time) * 0.01,
    -0.05 * u_time
);";

lavaNode.geometry.shaderModifiers =
  @{SCNShaderModifierEntryPointGeometry : modifier};

SCNNode *flattenedNode = [node flattenedClone];