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XNA L08–Amazing XNA Utilities

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Mohammad Shaker

Collision detection determines whether two objects in a virtual world overlap and have collided. Accurate collision detection is fundamental to a solid game engine. XNA has two main types for implementing collision detection: bounding boxes and bounding spheres. Bounding boxes are better for rectangular objects while bounding spheres offer a better fit for rounded objects. Both bounding boxes and bounding spheres can be used to check for intersections and containment between game objects.

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Mohammad Shaker mohammadshaker.com @ZGTRShaker 2011, 2012, 2013, 2014 XNA Game Development L08 – Amazing XNA Utilities
Collision Detection
Collision Detection determines whether two objects overlap and therefore have collided in your virtual world.
Collision Detection Accurate collision detection is fundamental to a solid game engine.
XNA L08–Amazing XNA Utilities
Your cars would drive off the road, your people would walk through buildings, and your camera would travel through cement walls :D
XNA L08–Amazing XNA Utilities
Collision Detection • Microsoft Book, Chapter 18, Page: 285
Collision Detection • XNA has two main types for implementing collision detection
Collision Detection • XNA has two main types for implementing collision detection – BoundingBox
Collision Detection • XNA has two main types for implementing collision detection – BoundingBox – BoundingSphere
Collision Detection • XNA has two main types for implementing collision detection – BoundingBox • a box will better suit a rectangular high-rise building – BoundingSphere
Collision Detection • XNA has two main types for implementing collision detection – BoundingBox • a box will better suit a rectangular high-rise building – BoundingSphere • a bounding sphere offers a better fit for rounded objects such as a domed arena
Collision Detection – BoundingSphere
Collision Detection – BoundingSphere
Collision Detection – BoundingSphere
Collision Detection – BoundingSphere
Collision Detection • CONTAINMENT TYPE – BoundingBox – BoundingSphere
Collision Detection • CONTAINMENT TYPE – BoundingBox – BoundingSphere
Collision Detection • CONTAINMENT TYPE – BoundingBox – BoundingSphere
Collision Detection BOUNDING BOX
Collision Detection - BOUNDING BOX • Initializing the Bounding BOX • Intersects() common overloads BoundingBox boundingBox = new BoundingBox(Vector3 min, Vector3 max); public bool Intersects(BoundingBox box); public bool Intersects(BoundingSphere sphere);
Collision Detection - BOUNDING BOX • Comparing one bounding box with another: • Comparing a bounding box with a bounding sphere: • Comparing a bounding box with a single three-dimensional position: public void Contains(ref BoundingBox box, out ContainmentType result); public void Contains(ref BoundingSphere sphere, out ContainmentType result); public void Contains(ref Vector3 point, out ContainmentType result);
Collision Detection BOUNDING SPHERE
Collision Detection - BOUNDING SPHERE • Initializing the Bounding Sphere • Intersects() Common Overloads • Contains() public BoundingSphere(Vector3 center, float radius); public bool Intersects(BoundingBox box); public bool Intersects(BoundingSphere sphere); public void Contains(ref BoundingSphere sphere,out ContainmentType result); public void Contains(ref BoundingBox box, out ContainmentType result); public void Contains(ref Vector3 point, out ContainmentType result);
Collision Detection - BOUNDING SPHERE • Initializing the Bounding Sphere • Intersects() Common Overloads • Contains() public bool Intersects(BoundingBox box); public bool Intersects(BoundingSphere sphere); public void Contains(ref BoundingSphere sphere,out ContainmentType result); public void Contains(ref BoundingBox box, out ContainmentType result); public void Contains(ref Vector3 point, out ContainmentType result); a three-dimensional position public BoundingSphere(Vector3 center, float radius);
Collision Detection • Different sphere groups for varying levels of efficiency and accuracy
Collision Detection • Microsoft, Collision Detection, P: 290 - 304
Check it out in “App1-CollisionDetection- Micosoft”
Collision Detection Apress book, Chapter 13, Page 367
Collision Detection
Collision Detection • Also, because the default model processor doesn’t generate a bounding box (AABB) volume, we need to generate one for the model
Collision Detection • Avoid testing the collision with each mesh of the model, by creating a global bounding sphere (or global bounding Box) for the entire model!
Collision Detection • Usage of bounding spheres is emphasized because spheres are easier to update and transform than bounding boxes
EARLY WARNING SYSTEMS Don’t check a 200 miles sphere collision with you! Rbwhitaker web site: http://rbwhitaker.wikidot.com/collision-detection
Collision Detection • Approximation
Collision Detection • Approximation
Collision Detection • Approximation
Collision Detection • Approximation When to use What?
Collision Detection • Approximation A better way to combine both approaches
Collision Detection hierarchical modeling
Collision Detection
Collision Detection
Collision Detection
Collision Detection In hierarchical model you would use both the large sphere, and the small spheres.
Collision Detection Quad Tree Approach
Collision Detection Example in XNA private bool IsCollision(Model model1, Matrix world1, Model model2, Matrix world2) { for (int meshIndex1 = 0; meshIndex1 < model1.Meshes.Count; meshIndex1++) { BoundingSphere sphere1 = model1.Meshes[meshIndex1].BoundingSphere; sphere1 = sphere1.Transform(world1); for (int meshIndex2 = 0; meshIndex2 < model2.Meshes.Count; meshIndex2++) { BoundingSphere sphere2 = model2.Meshes[meshIndex2].BoundingSphere; sphere2 = sphere2.Transform(world2); if (sphere1.Intersects(sphere2)) return true; } } return false; }
Collision Detection Example in XNA “App2-CollisionDetection-WebSite”
XNA With Windows Form App/ WPF App For more info, go to: http://www.codeproject.com/KB/game/XNA_And_Beyond.aspx
XNA With Windows Form App • 2 WAYS! – 2D Graphics (Professional) – Windows Forms (Ordinary)
XNA With Windows Form App • 2 WAYS! – 2D Graphics (Professional) • See the appendix for full tutorial pdf – Windows Forms (Ordinary)
XNA With Windows Form App • 2 WAYS! – 2D Graphics (Professional) • See the appendix for full tutorial pdf – Windows Forms (Ordinary) • Use the appended project directly
XNA With Windows Form App • 2 WAYS! – 2D Graphics (Professional) • See the appendix for full tutorial pdf – Windows Forms (Ordinary) • Use the appended project directly • OR, do it your self as the following slides
XNA With Windows Form App • Windows Forms! (See the template project in appendix)
XNA With Windows Form App • Steps – Add new Form in the same XNA Project (“Form1”); – Add Panel to the form you have just created (“Form1”); – Add to the top of “Form1” public IntPtr PanelHandle { get { return this.panel1.IsHandleCreated? this.panel1.Handle : IntPtr.Zero; } }
XNA With Windows Form App • Now, In Game1 class do the following – Add the following at the top (using, renaming namespace) – Create a reference to Form1 to handle the instance at runtime;using SysWinForms = System.Windows.Forms; Form1 myForm;
XNA With Windows Form App • Now, In Game1 class do the following – Add the following two methods – Create a reference to Form1 to handle the instance at runtime; – Initialize void myForm_HandleDestroyed(object sender, EventArgs e) { this.Exit(); } void gameWindowForm_Shown(object sender, EventArgs e) { ((SysWinForms.Form)sender).Hide(); }
XNA With Windows Form App • Now, In Game1 class do the following – Add the following code to Initialize() method – Create a reference to Form1 to handle the instance at runtime; – Initialize protected override void Initialize() { SysWinForms.Form gameWindowForm = (SysWinForms.Form)SysWinForms.Form.FromHandle(this.Window.Handle); gameWindowForm.Shown += new EventHandler(gameWindowForm_Shown); this.myForm = new Form1(); myForm.HandleDestroyed += new EventHandler(myForm_HandleDestroyed); myForm.Show(); base.Initialize(); }
XNA With Windows Form App • Now, In Game1 class do the following – Add the following code to Draw() method so it looks like this protected override void Draw(GameTime gameTime) { GraphicsDevice.Clear(Color.CornflowerBlue); base.Draw(gameTime); // This one will do the trick we are looking for! this.GraphicsDevice.Present(null, null, myForm.PanelHandle); }
XNA With Windows Form App • Now, ctrl+F5 and u r good to go!
2D and 3D Combined
2D and 3D Combined
2D and 3D Combined
2D and 3D Combined
2D and 3D Combined
2D and 3D Combined
2D and 3D Combined Begin Method (SpriteSortMode, BlendState, SamplerState, DepthStencilState, RasterizerState, Effect, Matrix) Begin Method () Begin Method (SpriteSortMode, BlendState) Begin Method (SpriteSortMode, BlendState, SamplerState, DepthStencilState, RasterizerState) Begin Method (SpriteSortMode, BlendState, SamplerState, DepthStencilState, RasterizerState, Effect) sortMode Sprite drawing order. blendState Blending options. samplerState Texture sampling options. depthStencilState Depth and stencil options. rasterizerState Rasterization options. effect Effect state options. transformMatrix Transformation matrix for scale, rotate, translate options.
2D and 3D Combined • SpriteSortMode
2D and 3D Combined • BlendState • See more: http://msdn.microsoft.com/en-us/library/microsoft.xna.framework.graphics.blend.aspx
2D and 3D Combined • BlendState
2D and 3D Combined • BlendState
2D and 3D Combined • BlendState
2D and 3D Combined spriteBatch.Begin(); spriteBatch.Begin(SpriteSortMode.Immediate, BlendState.Opaque); • finally! change SpriteBatch From • To
2D and 3D Combined spriteBatch.Begin(); spriteBatch.Begin(SpriteSortMode.Immediate, BlendState.Opaque); • finally! change SpriteBatch From • To
2D and 3D Combined spriteBatch.Begin(); spriteBatch.Begin(SpriteSortMode.Immediate, BlendState.AlphaBlend); • finally! change SpriteBatch From • To
2D and 3D Combined spriteBatch.Begin(); spriteBatch.Begin(SpriteSortMode.BackToFront, BlendState.AlphaBlend); • finally! change SpriteBatch From • To
Viewports & Split Screen Games
Viewports & Split Screen Games • Base Project • “App1-Viewports”
Viewports & Split Screen Games • Viewports
Viewports & Split Screen Games • Viewports – Multiple ones So, What’s the idea is all about?!
Viewports & Split Screen Games • Viewports – Multiple ones Multiple “Camera”s
Viewports & Split Screen Games • Viewports – Multiple ones Multiple “LookAt()”s
Viewports & Split Screen Games • Global Scope private Matrix topView = Matrix.CreateLookAt(new Vector3(0, 0, 4), new Vector3(0, 0, 0), new Vector3(0, 0.001f, 1f)); private Matrix frontView = Matrix.CreateLookAt(new Vector3(0, 4, 0), new Vector3(0, 0, 0), Vector3.UnitZ); private Matrix sideView = Matrix.CreateLookAt(new Vector3(4, 0, 0), new Vector3(0, 0, 0), Vector3.UnitZ); private Matrix perspectiveView = Matrix.CreateLookAt(new Vector3(4, 4, 4), new Vector3(0, 0, 0), Vector3.UnitZ); private Viewport topViewport; private Viewport sideViewport; private Viewport frontViewport; private Viewport perspectiveViewport;
private Matrix topView = Matrix.CreateLookAt(new Vector3(0, 0, 4), new Vector3(0, 0, 0), new Vector3(0, 0.001f, 1f)); private Matrix frontView = Matrix.CreateLookAt(new Vector3(0, 4, 0), new Vector3(0, 0, 0), Vector3.UnitZ); private Matrix sideView = Matrix.CreateLookAt(new Vector3(4, 0, 0), new Vector3(0, 0, 0), Vector3.UnitZ); private Matrix perspectiveView = Matrix.CreateLookAt(new Vector3(4, 4, 4), new Vector3(0, 0, 0), Vector3.UnitZ); private Viewport topViewport; private Viewport sideViewport; private Viewport frontViewport; private Viewport perspectiveViewport; Matrix.CreateLookAt(CameraPosition, CameraTarget, CameraUp); Viewports & Split Screen Games
LookAt()
• Initialize() protected override void Initialize() { base.Initialize(); int ViewportWidth = 200; int ViewportHeight = 200; Viewport defaultViewport = GraphicsDevice.Viewport; topViewport = defaultViewport; topViewport.X = 0; topViewport.Y = 0; topViewport.Width = ViewportWidth; topViewport.Height = ViewportHeight; topViewport.MinDepth = 0; topViewport.MaxDepth = 1; sideViewport = defaultViewport; sideViewport.X = ViewportWidth; sideViewport.Y = 0; sideViewport.Width = ViewportWidth; sideViewport.Height = ViewportHeight; sideViewport.MinDepth = 0; sideViewport.MaxDepth = 1; frontViewport = defaultViewport; frontViewport.X = 0; frontViewport.Y = ViewportHeight; frontViewport.Width = ViewportWidth; frontViewport.Height = ViewportHeight; frontViewport.MinDepth = 0; frontViewport.MaxDepth = 1; perspectiveViewport = defaultViewport; perspectiveViewport.X = ViewportWidth; perspectiveViewport.Y = ViewportHeight; perspectiveViewport.Width = ViewportWidth; perspectiveViewport.Height = ViewportHeight; perspectiveViewport.MinDepth = 0; perspectiveViewport.MaxDepth = 1; } Viewports & Split Screen Games
Viewports & Split Screen Games • Initialize() protected override void Initialize() { base.Initialize(); int ViewportWidth = 200; int ViewportHeight = 200; Viewport defaultViewport = GraphicsDevice.Viewport; topViewport = defaultViewport; topViewport.X = 0; topViewport.Y = 0; topViewport.Width = ViewportWidth; topViewport.Height = ViewportHeight; topViewport.MinDepth = 0; topViewport.MaxDepth = 1; sideViewport = defaultViewport; sideViewport.X = ViewportWidth; sideViewport.Y = 0; sideViewport.Width = ViewportWidth; sideViewport.Height = ViewportHeight; sideViewport.MinDepth = 0; sideViewport.MaxDepth = 1; frontViewport = defaultViewport; frontViewport.X = 0; frontViewport.Y = ViewportHeight; frontViewport.Width = ViewportWidth; frontViewport.Height = ViewportHeight; frontViewport.MinDepth = 0; frontViewport.MaxDepth = 1; perspectiveViewport = defaultViewport; perspectiveViewport.X = ViewportWidth; perspectiveViewport.Y = ViewportHeight; perspectiveViewport.Width = ViewportWidth; perspectiveViewport.Height = ViewportHeight; perspectiveViewport.MinDepth = 0; perspectiveViewport.MaxDepth = 1; }
• Initialize() protected override void Initialize() { base.Initialize(); int ViewportWidth = 200; int ViewportHeight = 200; Viewport defaultViewport = GraphicsDevice.Viewport; topViewport = defaultViewport; topViewport.X = 0; topViewport.Y = 0; topViewport.Width = ViewportWidth; topViewport.Height = ViewportHeight; topViewport.MinDepth = 0; topViewport.MaxDepth = 1; sideViewport = defaultViewport; sideViewport.X = ViewportWidth; sideViewport.Y = 0; sideViewport.Width = ViewportWidth; sideViewport.Height = ViewportHeight; sideViewport.MinDepth = 0; sideViewport.MaxDepth = 1; frontViewport = defaultViewport; frontViewport.X = 0; frontViewport.Y = ViewportHeight; frontViewport.Width = ViewportWidth; frontViewport.Height = ViewportHeight; frontViewport.MinDepth = 0; frontViewport.MaxDepth = 1; perspectiveViewport = defaultViewport; perspectiveViewport.X = ViewportWidth; perspectiveViewport.Y = ViewportHeight; perspectiveViewport.Width = ViewportWidth; perspectiveViewport.Height = ViewportHeight; perspectiveViewport.MinDepth = 0; perspectiveViewport.MaxDepth = 1; } Viewports & Split Screen Games
• Initialize() protected override void Initialize() { base.Initialize(); int ViewportWidth = 200; int ViewportHeight = 200; Viewport defaultViewport = GraphicsDevice.Viewport; topViewport = defaultViewport; topViewport.X = 0; topViewport.Y = 0; topViewport.Width = ViewportWidth; topViewport.Height = ViewportHeight; topViewport.MinDepth = 0; topViewport.MaxDepth = 1; sideViewport = defaultViewport; sideViewport.X = ViewportWidth; sideViewport.Y = 0; sideViewport.Width = ViewportWidth; sideViewport.Height = ViewportHeight; sideViewport.MinDepth = 0; sideViewport.MaxDepth = 1; frontViewport = defaultViewport; frontViewport.X = 0; frontViewport.Y = ViewportHeight; frontViewport.Width = ViewportWidth; frontViewport.Height = ViewportHeight; frontViewport.MinDepth = 0; frontViewport.MaxDepth = 1; perspectiveViewport = defaultViewport; perspectiveViewport.X = ViewportWidth; perspectiveViewport.Y = ViewportHeight; perspectiveViewport.Width = ViewportWidth; perspectiveViewport.Height = ViewportHeight; perspectiveViewport.MinDepth = 0; perspectiveViewport.MaxDepth = 1; } Viewports & Split Screen Games
Viewports & Split Screen Games
Viewports & Split Screen Games
Viewports & Split Screen Games
Viewports & Split Screen Games
Viewports & Split Screen Games
Viewports & Split Screen Games
Viewports & Split Screen Games • Draw()protected override void Draw(GameTime gameTime) { GraphicsDevice.Clear(Color.CornflowerBlue); Viewport original = graphics.GraphicsDevice.Viewport; graphics.GraphicsDevice.Viewport = topViewport; //GraphicsDevice.Clear(Color.Black); DrawModel(model, world, topView, projection); graphics.GraphicsDevice.Viewport = sideViewport; //GraphicsDevice.Clear(Color.Black); DrawModel(model, world, sideView, projection); graphics.GraphicsDevice.Viewport = frontViewport; //GraphicsDevice.Clear(Color.Black); DrawModel(model, world, frontView, projection); graphics.GraphicsDevice.Viewport = perspectiveViewport; //GraphicsDevice.Clear(Color.Black); DrawModel(model, world, perspectiveView, projection); GraphicsDevice.Viewport = original; base.Draw(gameTime); }
Viewports & Split Screen Games • Draw()protected override void Draw(GameTime gameTime) { GraphicsDevice.Clear(Color.CornflowerBlue); Viewport original = graphics.GraphicsDevice.Viewport; graphics.GraphicsDevice.Viewport = topViewport; //GraphicsDevice.Clear(Color.Black); DrawModel(model, world, topView, projection); graphics.GraphicsDevice.Viewport = sideViewport; //GraphicsDevice.Clear(Color.Black); DrawModel(model, world, sideView, projection); graphics.GraphicsDevice.Viewport = frontViewport; //GraphicsDevice.Clear(Color.Black); DrawModel(model, world, frontView, projection); graphics.GraphicsDevice.Viewport = perspectiveViewport; //GraphicsDevice.Clear(Color.Black); DrawModel(model, world, perspectiveView, projection); GraphicsDevice.Viewport = original; base.Draw(gameTime); }
Viewports & Split Screen Games • Draw()protected override void Draw(GameTime gameTime) { GraphicsDevice.Clear(Color.CornflowerBlue); Viewport original = graphics.GraphicsDevice.Viewport; graphics.GraphicsDevice.Viewport = topViewport; //GraphicsDevice.Clear(Color.Black); DrawModel(model, world, topView, projection); graphics.GraphicsDevice.Viewport = sideViewport; //GraphicsDevice.Clear(Color.Black); DrawModel(model, world, sideView, projection); graphics.GraphicsDevice.Viewport = frontViewport; //GraphicsDevice.Clear(Color.Black); DrawModel(model, world, frontView, projection); graphics.GraphicsDevice.Viewport = perspectiveViewport; //GraphicsDevice.Clear(Color.Black); DrawModel(model, world, perspectiveView, projection); GraphicsDevice.Viewport = original; base.Draw(gameTime); }
Viewports & Split Screen Games • Draw()protected override void Draw(GameTime gameTime) { GraphicsDevice.Clear(Color.CornflowerBlue); Viewport original = graphics.GraphicsDevice.Viewport; graphics.GraphicsDevice.Viewport = topViewport; //GraphicsDevice.Clear(Color.Black); DrawModel(model, world, topView, projection); graphics.GraphicsDevice.Viewport = sideViewport; //GraphicsDevice.Clear(Color.Black); DrawModel(model, world, sideView, projection); graphics.GraphicsDevice.Viewport = frontViewport; //GraphicsDevice.Clear(Color.Black); DrawModel(model, world, frontView, projection); graphics.GraphicsDevice.Viewport = perspectiveViewport; //GraphicsDevice.Clear(Color.Black); DrawModel(model, world, perspectiveView, projection); GraphicsDevice.Viewport = original; base.Draw(gameTime); }
Viewports & Split Screen Games • Draw()protected override void Draw(GameTime gameTime) { GraphicsDevice.Clear(Color.CornflowerBlue); Viewport original = graphics.GraphicsDevice.Viewport; graphics.GraphicsDevice.Viewport = topViewport; //GraphicsDevice.Clear(Color.Black); DrawModel(model, world, topView, projection); graphics.GraphicsDevice.Viewport = sideViewport; //GraphicsDevice.Clear(Color.Black); DrawModel(model, world, sideView, projection); graphics.GraphicsDevice.Viewport = frontViewport; //GraphicsDevice.Clear(Color.Black); DrawModel(model, world, frontView, projection); graphics.GraphicsDevice.Viewport = perspectiveViewport; //GraphicsDevice.Clear(Color.Black); DrawModel(model, world, perspectiveView, projection); GraphicsDevice.Viewport = original; base.Draw(gameTime); }
Viewports & Split Screen Games • “App2-ViewportsFinished”
Picking Objects
Picking Objects • How to pick?!
Picking Objects • How to pick?!
Picking Objects public Ray CalculateRay(Vector2 mouseLocation, Matrix view, Matrix projection, Viewport viewport) { Vector3 nearPoint = viewport.Unproject( new Vector3(mouseLocation.X, mouseLocation.Y, 0.0f), projection, view, Matrix.Identity); Vector3 farPoint = viewport.Unproject( new Vector3(mouseLocation.X, mouseLocation.Y, 1.0f), projection, view, Matrix.Identity); Vector3 direction = farPoint - nearPoint; direction.Normalize(); return new Ray(nearPoint, direction); }
Picking Objects public bool Intersects(Vector2 mouseLocation, Model model, Matrix world, Matrix view, Matrix projection, Viewport viewport) { for (int index = 0; index < model.Meshes.Count; index++) { BoundingSphere sphere = model.Meshes[index].BoundingSphere; sphere = sphere.Transform(world); float? distance = IntersectDistance(sphere, mouseLocation, view, projection, viewport); if (distance != null) { return true; } } return false; }
Picking Objects public float? IntersectDistance(BoundingSphere sphere, Vector2 mouseLocation, Matrix view, Matrix projection, Viewport viewport) { Ray mouseRay = CalculateRay(mouseLocation, view, projection, viewport); return mouseRay.Intersects(sphere); }
Picking Objects • “App-Picking”
Take a Look on my other courses @ http://www.slideshare.net/ZGTRZGTR Available courses to the date of this slide:
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XNA L08–Amazing XNA Utilities

  • 1. Mohammad Shaker mohammadshaker.com @ZGTRShaker 2011, 2012, 2013, 2014 XNA Game Development L08 – Amazing XNA Utilities
  • 3. Collision Detection determines whether two objects overlap and therefore have collided in your virtual world.
  • 4. Collision Detection Accurate collision detection is fundamental to a solid game engine.
  • 6. Your cars would drive off the road, your people would walk through buildings, and your camera would travel through cement walls :D
  • 8. Collision Detection • Microsoft Book, Chapter 18, Page: 285
  • 9. Collision Detection • XNA has two main types for implementing collision detection
  • 10. Collision Detection • XNA has two main types for implementing collision detection – BoundingBox
  • 11. Collision Detection • XNA has two main types for implementing collision detection – BoundingBox – BoundingSphere
  • 12. Collision Detection • XNA has two main types for implementing collision detection – BoundingBox • a box will better suit a rectangular high-rise building – BoundingSphere
  • 13. Collision Detection • XNA has two main types for implementing collision detection – BoundingBox • a box will better suit a rectangular high-rise building – BoundingSphere • a bounding sphere offers a better fit for rounded objects such as a domed arena
  • 18. Collision Detection • CONTAINMENT TYPE – BoundingBox – BoundingSphere
  • 19. Collision Detection • CONTAINMENT TYPE – BoundingBox – BoundingSphere
  • 20. Collision Detection • CONTAINMENT TYPE – BoundingBox – BoundingSphere
  • 22. Collision Detection - BOUNDING BOX • Initializing the Bounding BOX • Intersects() common overloads BoundingBox boundingBox = new BoundingBox(Vector3 min, Vector3 max); public bool Intersects(BoundingBox box); public bool Intersects(BoundingSphere sphere);
  • 23. Collision Detection - BOUNDING BOX • Comparing one bounding box with another: • Comparing a bounding box with a bounding sphere: • Comparing a bounding box with a single three-dimensional position: public void Contains(ref BoundingBox box, out ContainmentType result); public void Contains(ref BoundingSphere sphere, out ContainmentType result); public void Contains(ref Vector3 point, out ContainmentType result);
  • 25. Collision Detection - BOUNDING SPHERE • Initializing the Bounding Sphere • Intersects() Common Overloads • Contains() public BoundingSphere(Vector3 center, float radius); public bool Intersects(BoundingBox box); public bool Intersects(BoundingSphere sphere); public void Contains(ref BoundingSphere sphere,out ContainmentType result); public void Contains(ref BoundingBox box, out ContainmentType result); public void Contains(ref Vector3 point, out ContainmentType result);
  • 26. Collision Detection - BOUNDING SPHERE • Initializing the Bounding Sphere • Intersects() Common Overloads • Contains() public bool Intersects(BoundingBox box); public bool Intersects(BoundingSphere sphere); public void Contains(ref BoundingSphere sphere,out ContainmentType result); public void Contains(ref BoundingBox box, out ContainmentType result); public void Contains(ref Vector3 point, out ContainmentType result); a three-dimensional position public BoundingSphere(Vector3 center, float radius);
  • 27. Collision Detection • Different sphere groups for varying levels of efficiency and accuracy
  • 28. Collision Detection • Microsoft, Collision Detection, P: 290 - 304
  • 29. Check it out in “App1-CollisionDetection- Micosoft”
  • 30. Collision Detection Apress book, Chapter 13, Page 367
  • 32. Collision Detection • Also, because the default model processor doesn’t generate a bounding box (AABB) volume, we need to generate one for the model
  • 33. Collision Detection • Avoid testing the collision with each mesh of the model, by creating a global bounding sphere (or global bounding Box) for the entire model!
  • 34. Collision Detection • Usage of bounding spheres is emphasized because spheres are easier to update and transform than bounding boxes
  • 35. EARLY WARNING SYSTEMS Don’t check a 200 miles sphere collision with you! Rbwhitaker web site: http://rbwhitaker.wikidot.com/collision-detection
  • 40. Collision Detection • Approximation A better way to combine both approaches
  • 45. Collision Detection In hierarchical model you would use both the large sphere, and the small spheres.
  • 47. Collision Detection Example in XNA private bool IsCollision(Model model1, Matrix world1, Model model2, Matrix world2) { for (int meshIndex1 = 0; meshIndex1 < model1.Meshes.Count; meshIndex1++) { BoundingSphere sphere1 = model1.Meshes[meshIndex1].BoundingSphere; sphere1 = sphere1.Transform(world1); for (int meshIndex2 = 0; meshIndex2 < model2.Meshes.Count; meshIndex2++) { BoundingSphere sphere2 = model2.Meshes[meshIndex2].BoundingSphere; sphere2 = sphere2.Transform(world2); if (sphere1.Intersects(sphere2)) return true; } } return false; }
  • 48. Collision Detection Example in XNA “App2-CollisionDetection-WebSite”
  • 49. XNA With Windows Form App/ WPF App For more info, go to: http://www.codeproject.com/KB/game/XNA_And_Beyond.aspx
  • 50. XNA With Windows Form App • 2 WAYS! – 2D Graphics (Professional) – Windows Forms (Ordinary)
  • 51. XNA With Windows Form App • 2 WAYS! – 2D Graphics (Professional) • See the appendix for full tutorial pdf – Windows Forms (Ordinary)
  • 52. XNA With Windows Form App • 2 WAYS! – 2D Graphics (Professional) • See the appendix for full tutorial pdf – Windows Forms (Ordinary) • Use the appended project directly
  • 53. XNA With Windows Form App • 2 WAYS! – 2D Graphics (Professional) • See the appendix for full tutorial pdf – Windows Forms (Ordinary) • Use the appended project directly • OR, do it your self as the following slides
  • 54. XNA With Windows Form App • Windows Forms! (See the template project in appendix)
  • 55. XNA With Windows Form App • Steps – Add new Form in the same XNA Project (“Form1”); – Add Panel to the form you have just created (“Form1”); – Add to the top of “Form1” public IntPtr PanelHandle { get { return this.panel1.IsHandleCreated? this.panel1.Handle : IntPtr.Zero; } }
  • 56. XNA With Windows Form App • Now, In Game1 class do the following – Add the following at the top (using, renaming namespace) – Create a reference to Form1 to handle the instance at runtime;using SysWinForms = System.Windows.Forms; Form1 myForm;
  • 57. XNA With Windows Form App • Now, In Game1 class do the following – Add the following two methods – Create a reference to Form1 to handle the instance at runtime; – Initialize void myForm_HandleDestroyed(object sender, EventArgs e) { this.Exit(); } void gameWindowForm_Shown(object sender, EventArgs e) { ((SysWinForms.Form)sender).Hide(); }
  • 58. XNA With Windows Form App • Now, In Game1 class do the following – Add the following code to Initialize() method – Create a reference to Form1 to handle the instance at runtime; – Initialize protected override void Initialize() { SysWinForms.Form gameWindowForm = (SysWinForms.Form)SysWinForms.Form.FromHandle(this.Window.Handle); gameWindowForm.Shown += new EventHandler(gameWindowForm_Shown); this.myForm = new Form1(); myForm.HandleDestroyed += new EventHandler(myForm_HandleDestroyed); myForm.Show(); base.Initialize(); }
  • 59. XNA With Windows Form App • Now, In Game1 class do the following – Add the following code to Draw() method so it looks like this protected override void Draw(GameTime gameTime) { GraphicsDevice.Clear(Color.CornflowerBlue); base.Draw(gameTime); // This one will do the trick we are looking for! this.GraphicsDevice.Present(null, null, myForm.PanelHandle); }
  • 60. XNA With Windows Form App • Now, ctrl+F5 and u r good to go!
  • 61. 2D and 3D Combined
  • 62. 2D and 3D Combined
  • 63. 2D and 3D Combined
  • 64. 2D and 3D Combined
  • 65. 2D and 3D Combined
  • 66. 2D and 3D Combined
  • 67. 2D and 3D Combined Begin Method (SpriteSortMode, BlendState, SamplerState, DepthStencilState, RasterizerState, Effect, Matrix) Begin Method () Begin Method (SpriteSortMode, BlendState) Begin Method (SpriteSortMode, BlendState, SamplerState, DepthStencilState, RasterizerState) Begin Method (SpriteSortMode, BlendState, SamplerState, DepthStencilState, RasterizerState, Effect) sortMode Sprite drawing order. blendState Blending options. samplerState Texture sampling options. depthStencilState Depth and stencil options. rasterizerState Rasterization options. effect Effect state options. transformMatrix Transformation matrix for scale, rotate, translate options.
  • 68. 2D and 3D Combined • SpriteSortMode
  • 69. 2D and 3D Combined • BlendState • See more: http://msdn.microsoft.com/en-us/library/microsoft.xna.framework.graphics.blend.aspx
  • 70. 2D and 3D Combined • BlendState
  • 71. 2D and 3D Combined • BlendState
  • 72. 2D and 3D Combined • BlendState
  • 73. 2D and 3D Combined spriteBatch.Begin(); spriteBatch.Begin(SpriteSortMode.Immediate, BlendState.Opaque); • finally! change SpriteBatch From • To
  • 74. 2D and 3D Combined spriteBatch.Begin(); spriteBatch.Begin(SpriteSortMode.Immediate, BlendState.Opaque); • finally! change SpriteBatch From • To
  • 75. 2D and 3D Combined spriteBatch.Begin(); spriteBatch.Begin(SpriteSortMode.Immediate, BlendState.AlphaBlend); • finally! change SpriteBatch From • To
  • 76. 2D and 3D Combined spriteBatch.Begin(); spriteBatch.Begin(SpriteSortMode.BackToFront, BlendState.AlphaBlend); • finally! change SpriteBatch From • To
  • 77. Viewports & Split Screen Games
  • 78. Viewports & Split Screen Games • Base Project • “App1-Viewports”
  • 79. Viewports & Split Screen Games • Viewports
  • 80. Viewports & Split Screen Games • Viewports – Multiple ones So, What’s the idea is all about?!
  • 81. Viewports & Split Screen Games • Viewports – Multiple ones Multiple “Camera”s
  • 82. Viewports & Split Screen Games • Viewports – Multiple ones Multiple “LookAt()”s
  • 83. Viewports & Split Screen Games • Global Scope private Matrix topView = Matrix.CreateLookAt(new Vector3(0, 0, 4), new Vector3(0, 0, 0), new Vector3(0, 0.001f, 1f)); private Matrix frontView = Matrix.CreateLookAt(new Vector3(0, 4, 0), new Vector3(0, 0, 0), Vector3.UnitZ); private Matrix sideView = Matrix.CreateLookAt(new Vector3(4, 0, 0), new Vector3(0, 0, 0), Vector3.UnitZ); private Matrix perspectiveView = Matrix.CreateLookAt(new Vector3(4, 4, 4), new Vector3(0, 0, 0), Vector3.UnitZ); private Viewport topViewport; private Viewport sideViewport; private Viewport frontViewport; private Viewport perspectiveViewport;
  • 84. private Matrix topView = Matrix.CreateLookAt(new Vector3(0, 0, 4), new Vector3(0, 0, 0), new Vector3(0, 0.001f, 1f)); private Matrix frontView = Matrix.CreateLookAt(new Vector3(0, 4, 0), new Vector3(0, 0, 0), Vector3.UnitZ); private Matrix sideView = Matrix.CreateLookAt(new Vector3(4, 0, 0), new Vector3(0, 0, 0), Vector3.UnitZ); private Matrix perspectiveView = Matrix.CreateLookAt(new Vector3(4, 4, 4), new Vector3(0, 0, 0), Vector3.UnitZ); private Viewport topViewport; private Viewport sideViewport; private Viewport frontViewport; private Viewport perspectiveViewport; Matrix.CreateLookAt(CameraPosition, CameraTarget, CameraUp); Viewports & Split Screen Games
  • 86. • Initialize() protected override void Initialize() { base.Initialize(); int ViewportWidth = 200; int ViewportHeight = 200; Viewport defaultViewport = GraphicsDevice.Viewport; topViewport = defaultViewport; topViewport.X = 0; topViewport.Y = 0; topViewport.Width = ViewportWidth; topViewport.Height = ViewportHeight; topViewport.MinDepth = 0; topViewport.MaxDepth = 1; sideViewport = defaultViewport; sideViewport.X = ViewportWidth; sideViewport.Y = 0; sideViewport.Width = ViewportWidth; sideViewport.Height = ViewportHeight; sideViewport.MinDepth = 0; sideViewport.MaxDepth = 1; frontViewport = defaultViewport; frontViewport.X = 0; frontViewport.Y = ViewportHeight; frontViewport.Width = ViewportWidth; frontViewport.Height = ViewportHeight; frontViewport.MinDepth = 0; frontViewport.MaxDepth = 1; perspectiveViewport = defaultViewport; perspectiveViewport.X = ViewportWidth; perspectiveViewport.Y = ViewportHeight; perspectiveViewport.Width = ViewportWidth; perspectiveViewport.Height = ViewportHeight; perspectiveViewport.MinDepth = 0; perspectiveViewport.MaxDepth = 1; } Viewports & Split Screen Games
  • 87. Viewports & Split Screen Games • Initialize() protected override void Initialize() { base.Initialize(); int ViewportWidth = 200; int ViewportHeight = 200; Viewport defaultViewport = GraphicsDevice.Viewport; topViewport = defaultViewport; topViewport.X = 0; topViewport.Y = 0; topViewport.Width = ViewportWidth; topViewport.Height = ViewportHeight; topViewport.MinDepth = 0; topViewport.MaxDepth = 1; sideViewport = defaultViewport; sideViewport.X = ViewportWidth; sideViewport.Y = 0; sideViewport.Width = ViewportWidth; sideViewport.Height = ViewportHeight; sideViewport.MinDepth = 0; sideViewport.MaxDepth = 1; frontViewport = defaultViewport; frontViewport.X = 0; frontViewport.Y = ViewportHeight; frontViewport.Width = ViewportWidth; frontViewport.Height = ViewportHeight; frontViewport.MinDepth = 0; frontViewport.MaxDepth = 1; perspectiveViewport = defaultViewport; perspectiveViewport.X = ViewportWidth; perspectiveViewport.Y = ViewportHeight; perspectiveViewport.Width = ViewportWidth; perspectiveViewport.Height = ViewportHeight; perspectiveViewport.MinDepth = 0; perspectiveViewport.MaxDepth = 1; }
  • 88. • Initialize() protected override void Initialize() { base.Initialize(); int ViewportWidth = 200; int ViewportHeight = 200; Viewport defaultViewport = GraphicsDevice.Viewport; topViewport = defaultViewport; topViewport.X = 0; topViewport.Y = 0; topViewport.Width = ViewportWidth; topViewport.Height = ViewportHeight; topViewport.MinDepth = 0; topViewport.MaxDepth = 1; sideViewport = defaultViewport; sideViewport.X = ViewportWidth; sideViewport.Y = 0; sideViewport.Width = ViewportWidth; sideViewport.Height = ViewportHeight; sideViewport.MinDepth = 0; sideViewport.MaxDepth = 1; frontViewport = defaultViewport; frontViewport.X = 0; frontViewport.Y = ViewportHeight; frontViewport.Width = ViewportWidth; frontViewport.Height = ViewportHeight; frontViewport.MinDepth = 0; frontViewport.MaxDepth = 1; perspectiveViewport = defaultViewport; perspectiveViewport.X = ViewportWidth; perspectiveViewport.Y = ViewportHeight; perspectiveViewport.Width = ViewportWidth; perspectiveViewport.Height = ViewportHeight; perspectiveViewport.MinDepth = 0; perspectiveViewport.MaxDepth = 1; } Viewports & Split Screen Games
  • 89. • Initialize() protected override void Initialize() { base.Initialize(); int ViewportWidth = 200; int ViewportHeight = 200; Viewport defaultViewport = GraphicsDevice.Viewport; topViewport = defaultViewport; topViewport.X = 0; topViewport.Y = 0; topViewport.Width = ViewportWidth; topViewport.Height = ViewportHeight; topViewport.MinDepth = 0; topViewport.MaxDepth = 1; sideViewport = defaultViewport; sideViewport.X = ViewportWidth; sideViewport.Y = 0; sideViewport.Width = ViewportWidth; sideViewport.Height = ViewportHeight; sideViewport.MinDepth = 0; sideViewport.MaxDepth = 1; frontViewport = defaultViewport; frontViewport.X = 0; frontViewport.Y = ViewportHeight; frontViewport.Width = ViewportWidth; frontViewport.Height = ViewportHeight; frontViewport.MinDepth = 0; frontViewport.MaxDepth = 1; perspectiveViewport = defaultViewport; perspectiveViewport.X = ViewportWidth; perspectiveViewport.Y = ViewportHeight; perspectiveViewport.Width = ViewportWidth; perspectiveViewport.Height = ViewportHeight; perspectiveViewport.MinDepth = 0; perspectiveViewport.MaxDepth = 1; } Viewports & Split Screen Games
  • 90. Viewports & Split Screen Games
  • 91. Viewports & Split Screen Games
  • 92. Viewports & Split Screen Games
  • 93. Viewports & Split Screen Games
  • 94. Viewports & Split Screen Games
  • 95. Viewports & Split Screen Games
  • 96. Viewports & Split Screen Games • Draw()protected override void Draw(GameTime gameTime) { GraphicsDevice.Clear(Color.CornflowerBlue); Viewport original = graphics.GraphicsDevice.Viewport; graphics.GraphicsDevice.Viewport = topViewport; //GraphicsDevice.Clear(Color.Black); DrawModel(model, world, topView, projection); graphics.GraphicsDevice.Viewport = sideViewport; //GraphicsDevice.Clear(Color.Black); DrawModel(model, world, sideView, projection); graphics.GraphicsDevice.Viewport = frontViewport; //GraphicsDevice.Clear(Color.Black); DrawModel(model, world, frontView, projection); graphics.GraphicsDevice.Viewport = perspectiveViewport; //GraphicsDevice.Clear(Color.Black); DrawModel(model, world, perspectiveView, projection); GraphicsDevice.Viewport = original; base.Draw(gameTime); }
  • 97. Viewports & Split Screen Games • Draw()protected override void Draw(GameTime gameTime) { GraphicsDevice.Clear(Color.CornflowerBlue); Viewport original = graphics.GraphicsDevice.Viewport; graphics.GraphicsDevice.Viewport = topViewport; //GraphicsDevice.Clear(Color.Black); DrawModel(model, world, topView, projection); graphics.GraphicsDevice.Viewport = sideViewport; //GraphicsDevice.Clear(Color.Black); DrawModel(model, world, sideView, projection); graphics.GraphicsDevice.Viewport = frontViewport; //GraphicsDevice.Clear(Color.Black); DrawModel(model, world, frontView, projection); graphics.GraphicsDevice.Viewport = perspectiveViewport; //GraphicsDevice.Clear(Color.Black); DrawModel(model, world, perspectiveView, projection); GraphicsDevice.Viewport = original; base.Draw(gameTime); }
  • 98. Viewports & Split Screen Games • Draw()protected override void Draw(GameTime gameTime) { GraphicsDevice.Clear(Color.CornflowerBlue); Viewport original = graphics.GraphicsDevice.Viewport; graphics.GraphicsDevice.Viewport = topViewport; //GraphicsDevice.Clear(Color.Black); DrawModel(model, world, topView, projection); graphics.GraphicsDevice.Viewport = sideViewport; //GraphicsDevice.Clear(Color.Black); DrawModel(model, world, sideView, projection); graphics.GraphicsDevice.Viewport = frontViewport; //GraphicsDevice.Clear(Color.Black); DrawModel(model, world, frontView, projection); graphics.GraphicsDevice.Viewport = perspectiveViewport; //GraphicsDevice.Clear(Color.Black); DrawModel(model, world, perspectiveView, projection); GraphicsDevice.Viewport = original; base.Draw(gameTime); }
  • 99. Viewports & Split Screen Games • Draw()protected override void Draw(GameTime gameTime) { GraphicsDevice.Clear(Color.CornflowerBlue); Viewport original = graphics.GraphicsDevice.Viewport; graphics.GraphicsDevice.Viewport = topViewport; //GraphicsDevice.Clear(Color.Black); DrawModel(model, world, topView, projection); graphics.GraphicsDevice.Viewport = sideViewport; //GraphicsDevice.Clear(Color.Black); DrawModel(model, world, sideView, projection); graphics.GraphicsDevice.Viewport = frontViewport; //GraphicsDevice.Clear(Color.Black); DrawModel(model, world, frontView, projection); graphics.GraphicsDevice.Viewport = perspectiveViewport; //GraphicsDevice.Clear(Color.Black); DrawModel(model, world, perspectiveView, projection); GraphicsDevice.Viewport = original; base.Draw(gameTime); }
  • 100. Viewports & Split Screen Games • Draw()protected override void Draw(GameTime gameTime) { GraphicsDevice.Clear(Color.CornflowerBlue); Viewport original = graphics.GraphicsDevice.Viewport; graphics.GraphicsDevice.Viewport = topViewport; //GraphicsDevice.Clear(Color.Black); DrawModel(model, world, topView, projection); graphics.GraphicsDevice.Viewport = sideViewport; //GraphicsDevice.Clear(Color.Black); DrawModel(model, world, sideView, projection); graphics.GraphicsDevice.Viewport = frontViewport; //GraphicsDevice.Clear(Color.Black); DrawModel(model, world, frontView, projection); graphics.GraphicsDevice.Viewport = perspectiveViewport; //GraphicsDevice.Clear(Color.Black); DrawModel(model, world, perspectiveView, projection); GraphicsDevice.Viewport = original; base.Draw(gameTime); }
  • 101. Viewports & Split Screen Games • “App2-ViewportsFinished”
  • 105. Picking Objects public Ray CalculateRay(Vector2 mouseLocation, Matrix view, Matrix projection, Viewport viewport) { Vector3 nearPoint = viewport.Unproject( new Vector3(mouseLocation.X, mouseLocation.Y, 0.0f), projection, view, Matrix.Identity); Vector3 farPoint = viewport.Unproject( new Vector3(mouseLocation.X, mouseLocation.Y, 1.0f), projection, view, Matrix.Identity); Vector3 direction = farPoint - nearPoint; direction.Normalize(); return new Ray(nearPoint, direction); }
  • 106. Picking Objects public bool Intersects(Vector2 mouseLocation, Model model, Matrix world, Matrix view, Matrix projection, Viewport viewport) { for (int index = 0; index < model.Meshes.Count; index++) { BoundingSphere sphere = model.Meshes[index].BoundingSphere; sphere = sphere.Transform(world); float? distance = IntersectDistance(sphere, mouseLocation, view, projection, viewport); if (distance != null) { return true; } } return false; }
  • 107. Picking Objects public float? IntersectDistance(BoundingSphere sphere, Vector2 mouseLocation, Matrix view, Matrix projection, Viewport viewport) { Ray mouseRay = CalculateRay(mouseLocation, view, projection, viewport); return mouseRay.Intersects(sphere); }
  • 109. Take a Look on my other courses @ http://www.slideshare.net/ZGTRZGTR Available courses to the date of this slide: