public override void PresentStep(int index, PresentationViewController presentationViewController)
{
switch (index)
{
case 0:
// Set the slide's title and subtitle
TextManager.SetTitle("Scene Graph");
TextManager.SetSubtitle("Summary");
break;
case 1:
// A node that will help visualize the position of the stars
WireframeBoxNode = SCNNode.Create();
WireframeBoxNode.Rotation = new SCNVector4(0, 1, 0, (float)(Math.PI / 4));
WireframeBoxNode.Geometry = SCNBox.Create(1, 1, 1, 0);
WireframeBoxNode.Geometry.FirstMaterial.Diffuse.Contents = new NSImage(NSBundle.MainBundle.PathForResource("SharedTextures/box_wireframe", "png"));
WireframeBoxNode.Geometry.FirstMaterial.LightingModelName = SCNLightingModel.Constant; // no lighting
WireframeBoxNode.Geometry.FirstMaterial.DoubleSided = true; // double sided
// Sun
SunNode = SCNNode.Create();
SunNode.Position = new SCNVector3(0, 30, 0);
ContentNode.AddChildNode(SunNode);
SunNode.AddChildNode((SCNNode)WireframeBoxNode.Copy());
// Earth-rotation (center of rotation of the Earth around the Sun)
var earthRotationNode = SCNNode.Create();
SunNode.AddChildNode(earthRotationNode);
// Earth-group (will contain the Earth, and the Moon)
EarthGroupNode = SCNNode.Create();
EarthGroupNode.Position = new SCNVector3(15, 0, 0);
earthRotationNode.AddChildNode(EarthGroupNode);
// Earth
EarthNode = (SCNNode)WireframeBoxNode.Copy();
EarthNode.Position = new SCNVector3(0, 0, 0);
EarthGroupNode.AddChildNode(EarthNode);
// Rotate the Earth around the Sun
var animation = CABasicAnimation.FromKeyPath("rotation");
animation.Duration = 10.0f;
animation.To = NSValue.FromVector(new SCNVector4(0, 1, 0, (float)(Math.PI * 2)));
animation.RepeatCount = float.MaxValue;
earthRotationNode.AddAnimation(animation, new NSString("earth rotation around sun"));
// Rotate the Earth
animation = CABasicAnimation.FromKeyPath("rotation");
animation.Duration = 1.0f;
animation.From = NSValue.FromVector(new SCNVector4(0, 1, 0, 0));
animation.To = NSValue.FromVector(new SCNVector4(0, 1, 0, (float)(Math.PI * 2)));
animation.RepeatCount = float.MaxValue;
EarthNode.AddAnimation(animation, new NSString("earth rotation"));
break;
case 2:
// Moon-rotation (center of rotation of the Moon around the Earth)
var moonRotationNode = SCNNode.Create();
EarthGroupNode.AddChildNode(moonRotationNode);
// Moon
MoonNode = (SCNNode)WireframeBoxNode.Copy();
MoonNode.Position = new SCNVector3(5, 0, 0);
moonRotationNode.AddChildNode(MoonNode);
// Rotate the moon around the Earth
animation = CABasicAnimation.FromKeyPath("rotation");
animation.Duration = 1.5f;
animation.To = NSValue.FromVector(new SCNVector4(0, 1, 0, (float)(Math.PI * 2)));
animation.RepeatCount = float.MaxValue;
moonRotationNode.AddAnimation(animation, new NSString("moon rotation around earth"));
// Rotate the moon
animation = CABasicAnimation.FromKeyPath("rotation");
animation.Duration = 1.5f;
animation.To = NSValue.FromVector(new SCNVector4(0, 1, 0, (float)(Math.PI * 2)));
animation.RepeatCount = float.MaxValue;
MoonNode.AddAnimation(animation, new NSString("moon rotation"));
break;
case 3:
// Add geometries (spheres) to represent the stars
SunNode.Geometry = SCNSphere.Create(2.5f);
EarthNode.Geometry = SCNSphere.Create(1.5f);
MoonNode.Geometry = SCNSphere.Create(0.75f);
// Add a textured plane to represent Earth's orbit
var earthOrbit = SCNNode.Create();
earthOrbit.Opacity = 0.4f;
earthOrbit.Geometry = SCNPlane.Create(31, 31);
earthOrbit.Geometry.FirstMaterial.Diffuse.Contents = new NSImage(NSBundle.MainBundle.PathForResource("Scenes/earth/orbit", "png"));
earthOrbit.Geometry.FirstMaterial.Diffuse.MipFilter = SCNFilterMode.Linear;
earthOrbit.Rotation = new SCNVector4(1, 0, 0, -(float)(Math.PI / 2));
earthOrbit.Geometry.FirstMaterial.LightingModelName = SCNLightingModel.Constant; // no lighting
SunNode.AddChildNode(earthOrbit);
break;
case 4:
// Add a halo to the Sun (a simple textured plane that does not write to depth)
SunHaloNode = SCNNode.Create();
SunHaloNode.Geometry = SCNPlane.Create(30, 30);
SunHaloNode.Rotation = new SCNVector4(1, 0, 0, Pitch * (float)(Math.PI / 180.0f));
SunHaloNode.Geometry.FirstMaterial.Diffuse.Contents = new NSImage(NSBundle.MainBundle.PathForResource("Scenes/earth/sun-halo", "png"));
SunHaloNode.Geometry.FirstMaterial.LightingModelName = SCNLightingModel.Constant; // no lighting
SunHaloNode.Geometry.FirstMaterial.WritesToDepthBuffer = false; // do not write to depth
SunHaloNode.Opacity = 0.2f;
SunNode.AddChildNode(SunHaloNode);
// Add materials to the stars
EarthNode.Geometry.FirstMaterial.Diffuse.Contents = new NSImage(NSBundle.MainBundle.PathForResource("Scenes/earth/earth-diffuse-mini", "jpg"));
EarthNode.Geometry.FirstMaterial.Emission.Contents = new NSImage(NSBundle.MainBundle.PathForResource("Scenes/earth/earth-emissive-mini", "jpg"));
EarthNode.Geometry.FirstMaterial.Specular.Contents = new NSImage(NSBundle.MainBundle.PathForResource("Scenes/earth/earth-specular-mini", "jpg"));
MoonNode.Geometry.FirstMaterial.Diffuse.Contents = new NSImage(NSBundle.MainBundle.PathForResource("Scenes/earth/moon", "jpg"));
SunNode.Geometry.FirstMaterial.Multiply.Contents = new NSImage(NSBundle.MainBundle.PathForResource("Scenes/earth/sun", "jpg"));
SunNode.Geometry.FirstMaterial.Diffuse.Contents = new NSImage(NSBundle.MainBundle.PathForResource("Scenes/earth/sun", "jpg"));
SunNode.Geometry.FirstMaterial.Multiply.Intensity = 0.5f;
SunNode.Geometry.FirstMaterial.LightingModelName = SCNLightingModel.Constant;
SunNode.Geometry.FirstMaterial.Multiply.WrapS =
SunNode.Geometry.FirstMaterial.Diffuse.WrapS =
SunNode.Geometry.FirstMaterial.Multiply.WrapT =
SunNode.Geometry.FirstMaterial.Diffuse.WrapT = SCNWrapMode.Repeat;
EarthNode.Geometry.FirstMaterial.LocksAmbientWithDiffuse =
MoonNode.Geometry.FirstMaterial.LocksAmbientWithDiffuse =
SunNode.Geometry.FirstMaterial.LocksAmbientWithDiffuse = true;
EarthNode.Geometry.FirstMaterial.Shininess = 0.1f;
EarthNode.Geometry.FirstMaterial.Specular.Intensity = 0.5f;
MoonNode.Geometry.FirstMaterial.Specular.Contents = NSColor.Gray;
// Achieve a lava effect by animating textures
animation = CABasicAnimation.FromKeyPath("contentsTransform");
animation.Duration = 10.0f;
var animationTransform1 = CATransform3D.MakeTranslation(0, 0, 0);
animationTransform1 = animationTransform1.Concat(CATransform3D.MakeScale(3, 3, 3));
var animationTransform2 = CATransform3D.MakeTranslation(1, 0, 0);
animationTransform2 = animationTransform1.Concat(CATransform3D.MakeScale(3, 3, 3));
animation.From = NSValue.FromCATransform3D(animationTransform1);
animation.To = NSValue.FromCATransform3D(animationTransform2);
animation.RepeatCount = float.MaxValue;
SunNode.Geometry.FirstMaterial.Diffuse.AddAnimation(animation, new NSString("sun-texture"));
animation = CABasicAnimation.FromKeyPath("contentsTransform");
animation.Duration = 30.0f;
animationTransform1 = CATransform3D.MakeTranslation(0, 0, 0);
animationTransform1 = animationTransform1.Concat(CATransform3D.MakeScale(5, 5, 5));
animationTransform2 = CATransform3D.MakeTranslation(1, 0, 0);
animationTransform2 = animationTransform1.Concat(CATransform3D.MakeScale(5, 5, 5));
animation.From = NSValue.FromCATransform3D(animationTransform1);
animation.To = NSValue.FromCATransform3D(animationTransform2);
animation.RepeatCount = float.MaxValue;
SunNode.Geometry.FirstMaterial.Multiply.AddAnimation(animation, new NSString("sun-texture2"));
break;
case 5:
// We will turn off all the lights in the scene and add a new light
// to give the impression that the Sun lights the scene
var lightNode = SCNNode.Create();
lightNode.Light = SCNLight.Create();
lightNode.Light.Color = NSColor.Black; // initially switched off
lightNode.Light.LightType = SCNLightType.Omni;
SunNode.AddChildNode(lightNode);
// Configure attenuation distances because we don't want to light the floor
lightNode.Light.SetAttribute(new NSNumber(20), SCNLightAttribute.AttenuationEndKey);
lightNode.Light.SetAttribute(new NSNumber(19.5), SCNLightAttribute.AttenuationStartKey);
// Animation
SCNTransaction.Begin();
SCNTransaction.AnimationDuration = 1;
lightNode.Light.Color = NSColor.White; // switch on
presentationViewController.UpdateLightingWithIntensities(new float[] { 0.0f }); //switch off all the other lights
SunHaloNode.Opacity = 0.5f; // make the halo stronger
SCNTransaction.Commit();
break;
}
}
private void CreateLayers(UIImage image)
{
if (image == null)
{
return;
}
Layer.Sublayers = new CALayer[0];
var imageFrame = new CGRect(
Frame.Width / 2f - Frame.Width / 4f,
Frame.Height / 2f - Frame.Height / 4f,
Frame.Width / 2f,
Frame.Height / 2f);
var imgCenterPoint = new CGPoint(imageFrame.GetMidX(), imageFrame.GetMidY());
var lineFrame = new CGRect(
imageFrame.X - imageFrame.Width / 4f,
imageFrame.Y - imageFrame.Height / 4f,
imageFrame.Width * 1.5f,
imageFrame.Height * 1.5f);
//===============
// circle layer
//===============
circleShape = new CAShapeLayer();
circleShape.Bounds = imageFrame;
circleShape.Position = imgCenterPoint;
circleShape.Path = UIBezierPath.FromOval(imageFrame).CGPath;
circleShape.FillColor = circleColor.CGColor;
circleShape.Transform = CATransform3D.MakeScale(0.0f, 0.0f, 1.0f);
Layer.AddSublayer(circleShape);
circleMaskShape = new CAShapeLayer();
circleMaskShape.Bounds = imageFrame;
circleMaskShape.Position = imgCenterPoint;
circleMaskShape.FillRule = CAShapeLayer.FillRuleEvenOdd;
circleShape.Mask = circleMaskShape;
var maskPath = UIBezierPath.FromRect(imageFrame);
maskPath.AddArc(imgCenterPoint, 0.1f, 0.0f, fPI * 2f, true);
circleMaskShape.Path = maskPath.CGPath;
//===============
// line layer
//===============
lineShapes = new CAShapeLayer[5];
for (int i = 0; i < 5; i++)
{
var line = new CAShapeLayer();
line.Bounds = lineFrame;
line.Position = imgCenterPoint;
line.MasksToBounds = true;
line.Actions = NSDictionary.FromObjectsAndKeys(
new[] { NSNull.Null, NSNull.Null },
new[] { (NSString)"strokeStart", (NSString)"strokeEnd" });
line.StrokeColor = linesColor.CGColor;
line.LineWidth = 1.25f;
line.MiterLimit = 1.25f;
var path = new CGPath();
path.MoveToPoint(lineFrame.GetMidX(), lineFrame.GetMidY());
path.AddLineToPoint(lineFrame.X + lineFrame.Width / 2f, lineFrame.Y);
line.Path = path;
line.LineCap = CAShapeLayer.CapRound;
line.LineJoin = CAShapeLayer.JoinRound;
line.StrokeStart = 0.0f;
line.StrokeEnd = 0.0f;
line.Opacity = 0.0f;
line.Transform = CATransform3D.MakeRotation(fPI / 5f * (i * 2f + 1f), 0.0f, 0.0f, 1.0f);
Layer.AddSublayer(line);
lineShapes[i] = line;
}
//===============
// image layer
//===============
imageShape = new CAShapeLayer();
imageShape.Bounds = imageFrame;
imageShape.Position = imgCenterPoint;
imageShape.Path = UIBezierPath.FromRect(imageFrame).CGPath;
imageShape.FillColor = Checked ? Color.CGColor : SkeletonColor.CGColor;
imageShape.Actions = NSDictionary.FromObjectAndKey(NSNull.Null, (NSString)"fillColor");
Layer.AddSublayer(imageShape);
imageShape.Mask = new CALayer();
imageShape.Mask.Contents = image.CGImage;
imageShape.Mask.Bounds = imageFrame;
imageShape.Mask.Position = imgCenterPoint;
//==============================
// circle transform animation
//==============================
circleTransform.Values = new[]
{
NSValue.FromCATransform3D(CATransform3D.MakeScale(0.0f, 0.0f, 1.0f)), // 0/10
NSValue.FromCATransform3D(CATransform3D.MakeScale(0.5f, 0.5f, 1.0f)), // 1/10
NSValue.FromCATransform3D(CATransform3D.MakeScale(1.0f, 1.0f, 1.0f)), // 2/10
NSValue.FromCATransform3D(CATransform3D.MakeScale(1.2f, 1.2f, 1.0f)), // 3/10
NSValue.FromCATransform3D(CATransform3D.MakeScale(1.3f, 1.3f, 1.0f)), // 4/10
NSValue.FromCATransform3D(CATransform3D.MakeScale(1.37f, 1.37f, 1.0f)), // 5/10
NSValue.FromCATransform3D(CATransform3D.MakeScale(1.4f, 1.4f, 1.0f)), // 6/10
NSValue.FromCATransform3D(CATransform3D.MakeScale(1.4f, 1.4f, 1.0f)) // 10/10
};
circleTransform.KeyTimes = new[]
{
NSNumber.FromDouble(0.0), // 0/10
NSNumber.FromDouble(0.1), // 1/10
NSNumber.FromDouble(0.2), // 2/10
NSNumber.FromDouble(0.3), // 3/10
NSNumber.FromDouble(0.4), // 4/10
NSNumber.FromDouble(0.5), // 5/10
NSNumber.FromDouble(0.6), // 6/10
NSNumber.FromDouble(1.0) // 10/10
};
circleMaskTransform.Values = new[]
{
NSValue.FromCATransform3D(CATransform3D.Identity), // 0/10
NSValue.FromCATransform3D(CATransform3D.Identity), // 2/10
NSValue.FromCATransform3D(CATransform3D.MakeScale(imageFrame.Width * 1.25f, imageFrame.Height * 1.25f, 1.0f)), // 3/10
NSValue.FromCATransform3D(CATransform3D.MakeScale(imageFrame.Width * 2.688f, imageFrame.Height * 2.688f, 1.0f)), // 4/10
NSValue.FromCATransform3D(CATransform3D.MakeScale(imageFrame.Width * 3.923f, imageFrame.Height * 3.923f, 1.0f)), // 5/10
NSValue.FromCATransform3D(CATransform3D.MakeScale(imageFrame.Width * 4.375f, imageFrame.Height * 4.375f, 1.0f)), // 6/10
NSValue.FromCATransform3D(CATransform3D.MakeScale(imageFrame.Width * 4.731f, imageFrame.Height * 4.731f, 1.0f)), // 7/10
NSValue.FromCATransform3D(CATransform3D.MakeScale(imageFrame.Width * 5.0f, imageFrame.Height * 5.0f, 1.0f)), // 9/10
NSValue.FromCATransform3D(CATransform3D.MakeScale(imageFrame.Width * 5.0f, imageFrame.Height * 5.0f, 1.0f)) // 10/10
};
circleMaskTransform.KeyTimes = new[]
{
NSNumber.FromDouble(0.0), // 0/10
NSNumber.FromDouble(0.2), // 2/10
NSNumber.FromDouble(0.3), // 3/10
NSNumber.FromDouble(0.4), // 4/10
NSNumber.FromDouble(0.5), // 5/10
NSNumber.FromDouble(0.6), // 6/10
NSNumber.FromDouble(0.7), // 7/10
NSNumber.FromDouble(0.9), // 9/10
NSNumber.FromDouble(1.0) // 10/10
};
//==============================
// line stroke animation
//==============================
lineStrokeStart.Values = new[]
{
NSNumber.FromDouble(0.0), // 0/18
NSNumber.FromDouble(0.0), // 1/18
NSNumber.FromDouble(0.18), // 2/18
NSNumber.FromDouble(0.2), // 3/18
NSNumber.FromDouble(0.26), // 4/18
NSNumber.FromDouble(0.32), // 5/18
NSNumber.FromDouble(0.4), // 6/18
NSNumber.FromDouble(0.6), // 7/18
NSNumber.FromDouble(0.71), // 8/18
NSNumber.FromDouble(0.89), // 17/18
NSNumber.FromDouble(0.92) // 18/18
};
lineStrokeStart.KeyTimes = new[]
{
NSNumber.FromDouble(0.0), // 0/18
NSNumber.FromDouble(0.056), // 1/18
NSNumber.FromDouble(0.111), // 2/18
NSNumber.FromDouble(0.167), // 3/18
NSNumber.FromDouble(0.222), // 4/18
NSNumber.FromDouble(0.278), // 5/18
NSNumber.FromDouble(0.333), // 6/18
NSNumber.FromDouble(0.389), // 7/18
NSNumber.FromDouble(0.444), // 8/18
NSNumber.FromDouble(0.944), // 17/18
NSNumber.FromDouble(1.0), // 18/18
};
lineStrokeEnd.Values = new[]
{
NSNumber.FromDouble(0.0), // 0/18
NSNumber.FromDouble(0.0), // 1/18
NSNumber.FromDouble(0.32), // 2/18
NSNumber.FromDouble(0.48), // 3/18
NSNumber.FromDouble(0.64), // 4/18
NSNumber.FromDouble(0.68), // 5/18
NSNumber.FromDouble(0.92), // 17/18
NSNumber.FromDouble(0.92) // 18/18
};
lineStrokeEnd.KeyTimes = new[]
{
NSNumber.FromDouble(0.0), // 0/18
NSNumber.FromDouble(0.056), // 1/18
NSNumber.FromDouble(0.111), // 2/18
NSNumber.FromDouble(0.167), // 3/18
NSNumber.FromDouble(0.222), // 4/18
NSNumber.FromDouble(0.278), // 5/18
NSNumber.FromDouble(0.944), // 17/18
NSNumber.FromDouble(1.0), // 18/18
};
lineOpacity.Values = new[]
{
NSNumber.FromDouble(1.0), // 0/30
NSNumber.FromDouble(1.0), // 12/30
NSNumber.FromDouble(0.0) // 17/30
};
lineOpacity.KeyTimes = new[]
{
NSNumber.FromDouble(0.0), // 0/30
NSNumber.FromDouble(0.4), // 12/30
NSNumber.FromDouble(0.567) // 17/30
};
//==============================
// image transform animation
//==============================
imageTransform.Values = new[]
{
NSValue.FromCATransform3D(CATransform3D.MakeScale(0.0f, 0.0f, 1.0f)), // 0/30
NSValue.FromCATransform3D(CATransform3D.MakeScale(0.0f, 0.0f, 1.0f)), // 3/30
NSValue.FromCATransform3D(CATransform3D.MakeScale(1.2f, 1.2f, 1.0f)), // 9/30
NSValue.FromCATransform3D(CATransform3D.MakeScale(1.25f, 1.25f, 1.0f)), // 10/30
NSValue.FromCATransform3D(CATransform3D.MakeScale(1.2f, 1.2f, 1.0f)), // 11/30
NSValue.FromCATransform3D(CATransform3D.MakeScale(0.9f, 0.9f, 1.0f)), // 14/30
NSValue.FromCATransform3D(CATransform3D.MakeScale(0.875f, 0.875f, 1.0f)), // 15/30
NSValue.FromCATransform3D(CATransform3D.MakeScale(0.875f, 0.875f, 1.0f)), // 16/30
NSValue.FromCATransform3D(CATransform3D.MakeScale(0.9f, 0.9f, 1.0f)), // 17/30
NSValue.FromCATransform3D(CATransform3D.MakeScale(1.013f, 1.013f, 1.0f)), // 20/30
NSValue.FromCATransform3D(CATransform3D.MakeScale(1.025f, 1.025f, 1.0f)), // 21/30
NSValue.FromCATransform3D(CATransform3D.MakeScale(1.013f, 1.013f, 1.0f)), // 22/30
NSValue.FromCATransform3D(CATransform3D.MakeScale(0.96f, 0.96f, 1.0f)), // 25/30
NSValue.FromCATransform3D(CATransform3D.MakeScale(0.95f, 0.95f, 1.0f)), // 26/30
NSValue.FromCATransform3D(CATransform3D.MakeScale(0.96f, 0.96f, 1.0f)), // 27/30
NSValue.FromCATransform3D(CATransform3D.MakeScale(0.99f, 0.99f, 1.0f)), // 29/30
NSValue.FromCATransform3D(CATransform3D.Identity) // 30/30
};
imageTransform.KeyTimes = new[]
{
NSNumber.FromDouble(0.0), // 0/30
NSNumber.FromDouble(0.1), // 3/30
NSNumber.FromDouble(0.3), // 9/30
NSNumber.FromDouble(0.333), // 10/30
NSNumber.FromDouble(0.367), // 11/30
NSNumber.FromDouble(0.467), // 14/30
NSNumber.FromDouble(0.5), // 15/30
NSNumber.FromDouble(0.533), // 16/30
NSNumber.FromDouble(0.567), // 17/30
NSNumber.FromDouble(0.667), // 20/30
NSNumber.FromDouble(0.7), // 21/30
NSNumber.FromDouble(0.733), // 22/30
NSNumber.FromDouble(0.833), // 25/30
NSNumber.FromDouble(0.867), // 26/30
NSNumber.FromDouble(0.9), // 27/30
NSNumber.FromDouble(0.967), // 29/30
NSNumber.FromDouble(1.0) // 30/30
};
// re-set the durations
Duration = duration;
}
