The document discusses using 3D models, textures, lighting, fog, and animation in XNA game development. It explains how to load 3D models, apply the BasicEffect to set textures, lighting properties, and fog. It also demonstrates how to create simple animation by updating the model's position over time in the game's update loop and applying the transformation to the world matrix.

1. Mohammad Shaker
mohammadshaker.com
@ZGTRShaker
2011, 2012, 2013, 2014
XNA Game Development
L03 – Models, BasicEffect and Animation

2. Using 3D Models

3. Using 3D Models
Why using models?!

4. Some 3D Modeling Programs
• 3D Max
• Maya
• Blender
• Wings3D
• Google SketchUp
• … etc

5. Using 3D Models - Loading the Model
• Global Scope
private Model model; Initialize
LoadContent
UnloadContent
Update
Draw
Game1

6. Using 3D Models - Loading the Model
• Global Scope
• LoadContent()
private Model model;
model = Content.Load<Model>("Ship");
Initialize
LoadContent
UnloadContent
Update
Draw
Game1

7. Using 3D Models - Drawing the Model
• Must set appropriate matrices
private Matrix world = Matrix.CreateTranslation(new Vector3(0, 0, 0));
private Matrix view = Matrix.CreateLookAt(new Vector3(0, 0, 10),
new Vector3(0, 0, 0),
Vector3.UnitY);
private Matrix projection = Matrix.CreatePerspectiveFieldOfView(
MathHelper.ToRadians(45),
800f / 480f,
0.1f,
100f);

8. Using 3D Models
• DrawModel() and Draw()
private void DrawModel(Model model, Matrix world, Matrix view, Matrix projection)
{
foreach (ModelMesh mesh in model.Meshes)
{
foreach (BasicEffect effect in mesh.Effects)
{
effect.World = world;
effect.View = view;
effect.Projection = projection;
}
mesh.Draw();
}
}
protected override void Draw(GameTime gameTime)
{
GraphicsDevice.Clear(Color.CornflowerBlue);
DrawModel(helicopterModel, world, meshWorlds, view, projection);
base.Draw(gameTime);
}
Initialize
LoadContent
UnloadContent
Update
Draw
Game1

9. Using 3D Models
• DrawModel() and Draw()
private void DrawModel(Model model, Matrix world, Matrix view, Matrix projection)
{
foreach (ModelMesh mesh in model.Meshes)
{
foreach (BasicEffect effect in mesh.Effects)
{
effect.World = world;
effect.View = view;
effect.Projection = projection;
}
mesh.Draw();
}
}
protected override void Draw(GameTime gameTime)
{
GraphicsDevice.Clear(Color.CornflowerBlue);
DrawModel(helicopterModel, world, meshWorlds, view, projection);
base.Draw(gameTime);
}
Initialize
LoadContent
UnloadContent
Update
Draw
Game1

10. Using 3D Models
• “App-Using3DModels”

11. BasicEffect

12. BasicEffect
• Effects in XNA
– An effect is simply a method of designating how an object should be rendered on the screen.
– In the past (graphics API)
• tell the graphics card everything it needed to know
– HLSL
– It can be quite a bit of work to create a complete effect from scratch
• XNA guys delivered to us the “BasicEffect” class

13. BasicEffect
protected override void Draw(GameTime gameTime)
{
GraphicsDevice.Clear(Color.CornflowerBlue);
basicEffect.World = world;
basicEffect.View = view;
basicEffect.Projection = projection;
basicEffect.VertexColorEnabled = true;
foreach (EffectPass pass in basicEffect.CurrentTechnique.Passes)
{
pass.Apply();
GraphicsDevice.DrawUserPrimitives<> …
}
base.Draw(gameTime);
}

14. BasicEffect
protected override void Draw(GameTime gameTime)
{
GraphicsDevice.Clear(Color.CornflowerBlue);
basicEffect.World = world;
basicEffect.View = view;
basicEffect.Projection = projection;
basicEffect.VertexColorEnabled = true;
foreach (EffectPass pass in basicEffect.CurrentTechnique.Passes)
{
pass.Apply();
GraphicsDevice.DrawUserPrimitives<> …
}
base.Draw(gameTime);
}

15. BasicEffect
protected override void Draw(GameTime gameTime)
{
GraphicsDevice.Clear(Color.CornflowerBlue);
basicEffect.World = world;
basicEffect.View = view;
basicEffect.Projection = projection;
basicEffect.VertexColorEnabled = true;
foreach (EffectPass pass in basicEffect.CurrentTechnique.Passes)
{
pass.Apply();
GraphicsDevice.DrawUserPrimitives<> …
}
base.Draw(gameTime);
}

16. BasicEffect
private void DrawModel(Model model, Matrix world, Matrix view, Matrix projection) {
foreach (ModelMesh mesh in model.Meshes)
{
foreach (BasicEffect effect in mesh.Effects)
{
effect.World = world;
effect.View = view;
effect.Projection = projection;
}
mesh.Draw();
}
}

17. BasicEffect
• Changing BasicEffect Texture
effect.Texture = otherTexture; // otherTexture is of the type "Texture2D"

18. BasicEffect
• Changing BasicEffect Texture
effect.Texture = otherTexture; // otherTexture is of the type "Texture2D"

19. BasicEffect
• Not using Texture!
effect.Texture = otherTexture; // otherTexture is of the type "Texture2D"

20. Lighting

21. Lighting
• Diffuse Light
– Diffuse light is the basic kind of light. This is the kind of light that lights an object we are
viewing, for the most part. The intensity of the light mostly comes from the angle the surface
makes with the light itself, so surfaces that face away from the light don't aren't bright at all,
while surfaces that face the light are lit up pretty well.

22. Lighting
• Specular Light
– Specular light (or specular highlights) are the shiny spots that appear when an object is
somewhat reflective. This light is based on how reflective the surface is, as well as the angle
that is being made between the light source, the surface, and the viewer.

23. Lighting
• Ambient Light
– Ambient light is light that doesn't come from any particular light source, but instead is kind of
"background light" that comes from all over. In the real world, there is always a small amount
of ambient light, and in our game, we will want to add a little bit to make our objects look
more realistic.

24. Lighting
• Emissive Light
– Emissive light is light that is coming from the surface itself. In games, however, emissive light
doesn't automatically light up nearby objects, so it often doesn't have the same effect that we
would like, but it still has its uses.

25. Lighting with the BasicEffect Class
• Default Lighting
effect.EnableDefaultLighting();

26. Lighting with the BasicEffect Class
• Default Lighting
• Custom Lighting
effect.EnableDefaultLighting();

27. Lighting with the BasicEffect Class
• Default Lighting
• Custom Lighting
effect.EnableDefaultLighting();
effect.LightingEnabled = true; // turn on the lighting subsystem.
effect.DirectionalLight0.DiffuseColor = new Vector3(0.5f, 0, 0); // a red light
effect.DirectionalLight0.Direction = new Vector3(1, 0, 0); // coming along the x-axis
effect.DirectionalLight0.SpecularColor = new Vector3(0, 1, 0); // with green highlights

28. Lighting with the BasicEffect Class
• Default Lighting
• Custom Lighting
effect.EnableDefaultLighting();
effect.LightingEnabled = true; // turn on the lighting subsystem.
effect.DirectionalLight0.DiffuseColor = new Vector3(0.5f, 0, 0); // a red light
effect.DirectionalLight0.Direction = new Vector3(1, 0, 0); // coming along the x-axis
effect.DirectionalLight0.SpecularColor = new Vector3(0, 1, 0); // with green highlights
R G B

29. Lighting with the BasicEffect Class
• Default Lighting
• Custom Lighting
effect.EnableDefaultLighting();
effect.LightingEnabled = true; // turn on the lighting subsystem.
effect.DirectionalLight0.DiffuseColor = new Vector3(0.5f, 0, 0); // a red light
effect.DirectionalLight0.Direction = new Vector3(1, 0, 0); // coming along the x-axis
effect.DirectionalLight0.SpecularColor = new Vector3(0, 1, 0); // with green highlights
R G B
X Y Z

30. Lighting with the BasicEffect Class
• Default Lighting
• Custom Lighting
effect.EnableDefaultLighting();
effect.LightingEnabled = true; // turn on the lighting subsystem.
effect.DirectionalLight0.DiffuseColor = new Vector3(0.5f, 0, 0); // a red light
effect.DirectionalLight0.Direction = new Vector3(1, 0, 0); // coming along the x-axis
effect.DirectionalLight0.SpecularColor = new Vector3(0, 1, 0); // with green highlights
R G B
X Y Z
R G B

32. Lighting with the BasicEffect Class
• You can turn individual lights on and off with
• you can set the effect's ambient light color
effect.DirectionalLight0.Enabled = false;
effect.AmbientLightColor = new Vector3(0.2f, 0.2f, 0.2f);
effect.EmissiveColor = new Vector3(1, 0, 0);

33. Lighting with the BasicEffect Class
• “App2-BasicEffectLighting”

34. BasicEffect Fog
Why using fog?

35. BasicEffect Fog
Why using fog?
For instance; Can be used to hide a close far-clipping plane

36. BasicEffect Fog
• Rendering Fog with the BasicEffect Class
effect.FogEnabled = true;
effect.FogColor = Color.CornflowerBlue.ToVector3();
effect.FogStart = 9.75f;
effect.FogEnd = 10.25f;

37. BasicEffect Fog
• Rendering Fog with the BasicEffect Class
effect.FogEnabled = true;
effect.FogColor = Color.CornflowerBlue.ToVector3();
effect.FogStart = 9.75f;
effect.FogEnd = 10.25f;

38. 3D Animation

39. Basic Matrices

40. Basic Matrices

41. Basic Matrices

42. Basic Matrices

43. Basic Matrices

44. Basic Matrices

45. 3D Animation
• Create a Place to Store the Position
private Vector3 position;

46. 3D Animation
• Create a Place to Store the Position
• Initialize the Position
• Creating animation/ Updating Position!
private Vector3 position;
position= new Vector3(0, 0, 0);
position += new Vector3(0, 0.01f, 0);

47. 3D Animation
• Create a Place to Store the Position
• Initialize the Position
• Creating animation/ Updating Position!
private Vector3 position;
position= new Vector3(0, 0, 0);
position += new Vector3(0, 0.01f, 0);

48. 3D Animation
• Create a Place to Store the Position
• Initialize the Position
• Creating animation/ Updating Position!
private Vector3 position;
position= new Vector3(0, 0, 0);
position += new Vector3(0, 0.01f, 0);

49. 3D Animation
• Create a Place to Store the Position
• Initialize the Position
• Creating animation/ Updating Position!
private Vector3 position;
position= new Vector3(0, 0, 0);
position += new Vector3(0, 0.01f, 0);

50. 3D Animation
• Create a Place to Store the Position
• Initialize the Position
• Creating animation/ Updating Position!
private Vector3 position;
position= new Vector3(0, 0, 0);
position += new Vector3(0, 0.01f, 0);
LoadContent() Update() Draw()

51. 3D Animation
• Create a Place to Store the Position
• Initialize the Position
• Creating animation/ Updating Position!
private Vector3 position;
position= new Vector3(0, 0, 0);
position += new Vector3(0, 0.01f, 0);
LoadContent() Update() Draw()

52. 3D Animation
• Now we want to move the Model
– “Attaching position vector with our model”
world = Matrix.CreateTranslation(position);

53. 3D Animation
• Now we want to move the Model
– “Attaching position vector with our model”
world = Matrix.CreateTranslation(position);

54. 3D Animation
• Now we want to move the Model
– “Attaching position vector with our model”
world = Matrix.CreateTranslation(position);

55. 3D Animation
• Now we want to move the Model
– “Attaching position vector with our model”
world = Matrix.CreateTranslation(position);

56. 3D Animation
• Create a Place to Store the Position
• Initialize the Position
• Creating animation/ Updating Position!
private Vector3 position;
position= new Vector3(0, 0, 0);
position += new Vector3(0, 0.01f, 0);
world = Matrix.CreateTranslation(position);

57. 3D Animation
• Create a Place to Store the Position
• Initialize the Position
• Creating animation/ Updating Position!
private Vector3 position;
position= new Vector3(0, 0, 0);
position += new Vector3(0, 0.01f, 0);
world = Matrix.CreateTranslation(position);

58. 3D Animation
• Create a Place to Store the Position
• Initialize the Position
• Creating animation/ Updating Position!
private Vector3 position;
position= new Vector3(0, 0, 0);
position += new Vector3(0, 0.01f, 0);
world = Matrix.CreateTranslation(position);

59. 3D Animation
• Create a Place to Store the Position
• Initialize the Position
• Creating animation/ Updating Position!
private Vector3 position;
position= new Vector3(0, 0, 0);
position += new Vector3(0, 0.01f, 0);
world = Matrix.CreateTranslation(position);

60. 3D Animation

61. 3D Animation

62. 3D Animation

63. 3D Animation

64. 3D Animation

65. 3D Animation

66. 3D Animation

67. • Create a Place to Store the Position
• Initialize the Position
• Creating animation/ Updating Position!
private Vector3 position;
position= new Vector3(0, 0, 0);
position += new Vector3(0, 0.01f, 0);
world = Matrix.CreateTranslation(position);
3D Animation

68. 3D Animation

69. 3D Animation

70. 3D Animation

71. 3D Animation

72. • Create a Place to Store the Position
• Initialize the Position
• Creating animation/ Updating Position!
private Vector3 position;
position= new Vector3(0, 0, 0);
position += new Vector3(0, 0.01f, 0);
world = Matrix.CreateTranslation(position);
3D Animation

73. • Create a Place to Store the Position
• Initialize the Position
• Creating animation/ Updating Position!
private Vector3 position;
position= new Vector3(0, 0, 0);
position += new Vector3(0, 0.01f, 0);
world = Matrix.CreateTranslation(position);
3D Animation

74. • Create a Place to Store the Position
• Initialize the Position
• Creating animation/ Updating Position!
private Vector3 position;
position= new Vector3(0, 0, 0);
position += new Vector3(0, 0.01f, 0);
world = Matrix.CreateTranslation(position);
3D Animation

75. • Create a Place to Store the Position
• Initialize the Position
• Creating animation/ Updating Position!
private Vector3 position;
position= new Vector3(0, 0, 0);
position += new Vector3(0, 0.01f, 0);
world = Matrix.CreateTranslation(position);
3D Animation

76. • Create a Place to Store the Position
• Initialize the Position
• Creating animation/ Updating Position!
private Vector3 position;
position= new Vector3(0, 0, 0);
position += new Vector3(0, 0.01f, 0);
world = Matrix.CreateTranslation(position);
3D Animation

77. • Create a Place to Store the Position
• Initialize the Position
• Creating animation/ Updating Position!
private Vector3 position;
position= new Vector3(0, 0, 0);
position += new Vector3(0, 0.01f, 0);
world = Matrix.CreateTranslation(position);
3D Animation

78. • Create a Place to Store the Position
• Initialize the Position
• Creating animation/ Updating Position!
private Vector3 position;
private float angle;
position= new Vector3(0, 0, 0);
angle = 0;
position += new Vector3(0, 0.01f, 0);
world = Matrix.CreateTranslation(position);
3D Animation

79. • Create a Place to Store the Position
• Initialize the Position
• Creating animation/ Updating Position!
private Vector3 position;
private float angle;
position= new Vector3(0, 0, 0);
angle = 0;
position += new Vector3(0, 0.01f, 0);
angle += 0.03f;
world = Matrix.CreateTranslation(position);
3D Animation

80. • Create a Place to Store the Position
• Initialize the Position
• Creating animation/ Updating Position!
private Vector3 position;
private float angle;
position= new Vector3(0, 0, 0);
angle = 0;
position += new Vector3(0, 0.01f, 0);
angle += 0.03f;
world = Matrix.CreateTranslation(position);
3D Animation

81. • Create a Place to Store the Position
• Initialize the Position
• Creating animation/ Updating Position!
private Vector3 position;
private float angle;
position= new Vector3(0, 0, 0);
angle = 0;
position += new Vector3(0, 0.01f, 0);
angle += 0.03f;
world = Matrix.CreateRotationY(angle) *
Matrix.CreateTranslation(position);
3D Animation

82. • Create a Place to Store the Position
• Initialize the Position
• Creating animation/ Updating Position!
private Vector3 position;
private float angle;
position= new Vector3(0, 0, 0);
angle = 0;
position += new Vector3(0, 0.01f, 0);
angle += 0.03f;
world = Matrix.CreateRotationY(angle) *
Matrix.CreateTranslation(position);
3D Animation

83. 3D Animation
• “App1-Animation”

84. Mesh-by-Mesh Animation

85. Mesh-by-Mesh Animation
What’s that?

86. Mesh-by-Mesh Animation
• Firing Up!
– Setup
• We will first need to acquire a model that has different parts that will allow us to do the movements
that we want
• Our "Helicopter" model included in appendix

87. Mesh-by-Mesh Animation
• Adding global variables
private Model helicopterModel;
private float mainRotorAngle = 0;
private float tailRotorAngle = 0;
private Vector3 location = new Vector3(0, 0, 0);
private float angle = 0f;
private Matrix world = Matrix.CreateTranslation(new Vector3(0, 0, 0));
private Matrix view = Matrix.CreateLookAt(new Vector3(10, 10, 10),
new Vector3(0, 0, 0),
Vector3.UnitY);
private Matrix projection = Matrix.CreatePerspectiveFieldOfView(
MathHelper.ToRadians(45),
800f / 600f, 0.1f, 100f);

88. Mesh-by-Mesh Animation
• Adding global variables
private Model helicopterModel;
private float mainRotorAngle = 0;
private float tailRotorAngle = 0;
private Vector3 location = new Vector3(0, 0, 0);
private float angle = 0f;
private Matrix world = Matrix.CreateTranslation(new Vector3(0, 0, 0));
private Matrix view = Matrix.CreateLookAt(new Vector3(10, 10, 10),
new Vector3(0, 0, 0),
Vector3.UnitY);
private Matrix projection = Matrix.CreatePerspectiveFieldOfView(
MathHelper.ToRadians(45),
800f / 600f, 0.1f, 100f);

89. Mesh-by-Mesh Animation
• Adding global variables
private Model helicopterModel;
private float mainRotorAngle = 0;
private float tailRotorAngle = 0;
private Vector3 location = new Vector3(0, 0, 0);
private float angle = 0f;
private Matrix world = Matrix.CreateTranslation(new Vector3(0, 0, 0));
private Matrix view = Matrix.CreateLookAt(new Vector3(10, 10, 10),
new Vector3(0, 0, 0),
Vector3.UnitY);
private Matrix projection = Matrix.CreatePerspectiveFieldOfView(
MathHelper.ToRadians(45),
800f / 600f, 0.1f, 100f);

90. Mesh-by-Mesh Animation
• Adding global variables
private Model helicopterModel;
private float mainRotorAngle = 0;
private float tailRotorAngle = 0;
private Vector3 location = new Vector3(0, 0, 0);
private float angle = 0f;
private Matrix world = Matrix.CreateTranslation(new Vector3(0, 0, 0));
private Matrix view = Matrix.CreateLookAt(new Vector3(10, 10, 10),
new Vector3(0, 0, 0),
Vector3.UnitY);
private Matrix projection = Matrix.CreatePerspectiveFieldOfView(
MathHelper.ToRadians(45),
800f / 600f, 0.1f, 100f);

91. Mesh-by-Mesh Animation
• Adding global variables
private Model helicopterModel;
private float mainRotorAngle = 0;
private float tailRotorAngle = 0;
private Vector3 location = new Vector3(0, 0, 0);
private float angle = 0f;
private Matrix world = Matrix.CreateTranslation(new Vector3(0, 0, 0));
private Matrix view = Matrix.CreateLookAt(new Vector3(10, 10, 10),
new Vector3(0, 0, 0),
Vector3.UnitY);
private Matrix projection = Matrix.CreatePerspectiveFieldOfView(
MathHelper.ToRadians(45),
800f / 600f, 0.1f, 100f);

92. Mesh-by-Mesh Animation
• Loading the model in LoadContent() method
• Updating the angles and location of the Helicopter model in Update()method
helicopterModel = Content.Load<Model>("Helicopter");
tailRotorAngle -= 0.15f;
mainRotorAngle -= 0.15f;
angle += 0.02f;
location += Vector3.Transform(new Vector3(0.1f, 0, 0),
Matrix.CreateRotationY(MathHelper.ToRadians(90) + angle));

93. Mesh-by-Mesh Animation
protected override void Draw(GameTime gameTime)
{
GraphicsDevice.Clear(Color.CornflowerBlue);
Matrix[] meshWorlds = new Matrix[3];
meshWorlds[0] = Matrix.CreateTranslation(new Vector3(0, 0, 0));
meshWorlds[1] = Matrix.CreateRotationY(mainRotorAngle);
meshWorlds[2] = Matrix.CreateTranslation(new Vector3(0, -0.25f, -3.4f)) *
Matrix.CreateRotationX(tailRotorAngle) *
Matrix.CreateTranslation(new Vector3(0, 0.25f, 3.4f));
world = Matrix.CreateRotationY(angle) * Matrix.CreateTranslation(location);
DrawModel(helicopterModel, world, meshWorlds, view, projection);
base.Draw(gameTime);
}

94. Mesh-by-Mesh Animation
protected override void Draw(GameTime gameTime)
{
GraphicsDevice.Clear(Color.CornflowerBlue);
Matrix[] meshWorlds = new Matrix[3];
meshWorlds[0] = Matrix.CreateTranslation(new Vector3(0, 0, 0));
meshWorlds[1] = Matrix.CreateRotationY(mainRotorAngle);
meshWorlds[2] = Matrix.CreateTranslation(new Vector3(0, -0.25f, -3.4f)) *
Matrix.CreateRotationX(tailRotorAngle) *
Matrix.CreateTranslation(new Vector3(0, 0.25f, 3.4f));
world = Matrix.CreateRotationY(angle) * Matrix.CreateTranslation(location);
DrawModel(helicopterModel, world, meshWorlds, view, projection);
base.Draw(gameTime);
}

95. Mesh-by-Mesh Animation
• New Draw() method
protected override void Draw(GameTime gameTime)
{
GraphicsDevice.Clear(Color.CornflowerBlue);
Matrix[] meshWorlds = new Matrix[3];
meshWorlds[0] = Matrix.CreateTranslation(new Vector3(0, 0, 0));
meshWorlds[1] = Matrix.CreateRotationY(mainRotorAngle);
meshWorlds[2] = Matrix.CreateTranslation(new Vector3(0, -0.25f, -3.4f)) *
Matrix.CreateRotationX(tailRotorAngle) *
Matrix.CreateTranslation(new Vector3(0, 0.25f, 3.4f));
world = Matrix.CreateRotationY(angle) * Matrix.CreateTranslation(location);
DrawModel(helicopterModel, world, meshWorlds, view, projection);
base.Draw(gameTime);
}

96. Mesh-by-Mesh Animation
• New Draw() method
protected override void Draw(GameTime gameTime)
{
GraphicsDevice.Clear(Color.CornflowerBlue);
Matrix[] meshWorlds = new Matrix[3];
meshWorlds[0] = Matrix.CreateTranslation(new Vector3(0, 0, 0));
meshWorlds[1] = Matrix.CreateRotationY(mainRotorAngle);
meshWorlds[2] = Matrix.CreateTranslation(new Vector3(0, -0.25f, -3.4f)) *
Matrix.CreateRotationX(tailRotorAngle) *
Matrix.CreateTranslation(new Vector3(0, 0.25f, 3.4f));
world = Matrix.CreateRotationY(angle) * Matrix.CreateTranslation(location);
DrawModel(helicopterModel, world, meshWorlds, view, projection);
base.Draw(gameTime);
}

97. Mesh-by-Mesh Animation
• New Draw() method
protected override void Draw(GameTime gameTime)
{
GraphicsDevice.Clear(Color.CornflowerBlue);
Matrix[] meshWorlds = new Matrix[3];
meshWorlds[0] = Matrix.CreateTranslation(new Vector3(0, 0, 0));
meshWorlds[1] = Matrix.CreateRotationY(mainRotorAngle);
meshWorlds[2] = Matrix.CreateTranslation(new Vector3(0, -0.25f, -3.4f)) *
Matrix.CreateRotationX(tailRotorAngle) *
Matrix.CreateTranslation(new Vector3(0, 0.25f, 3.4f));
world = Matrix.CreateRotationY(angle) * Matrix.CreateTranslation(location);
DrawModel(helicopterModel, world, meshWorlds, view, projection);
base.Draw(gameTime);
}

98. Mesh-by-Mesh Animation
• New Draw() method
protected override void Draw(GameTime gameTime)
{
GraphicsDevice.Clear(Color.CornflowerBlue);
Matrix[] meshWorlds = new Matrix[3];
meshWorlds[0] = Matrix.CreateTranslation(new Vector3(0, 0, 0));
meshWorlds[1] = Matrix.CreateRotationY(mainRotorAngle);
meshWorlds[2] = Matrix.CreateTranslation(new Vector3(0, -0.25f, -3.4f)) *
Matrix.CreateRotationX(tailRotorAngle) *
Matrix.CreateTranslation(new Vector3(0, 0.25f, 3.4f));
world = Matrix.CreateRotationY(angle) * Matrix.CreateTranslation(location);
DrawModel(helicopterModel, world, meshWorlds, view, projection);
base.Draw(gameTime);
}

99. Mesh-by-Mesh Animation
• New Draw() method
protected override void Draw(GameTime gameTime)
{
GraphicsDevice.Clear(Color.CornflowerBlue);
Matrix[] meshWorlds = new Matrix[3];
meshWorlds[0] = Matrix.CreateTranslation(new Vector3(0, 0, 0));
meshWorlds[1] = Matrix.CreateRotationY(mainRotorAngle);
meshWorlds[2] = Matrix.CreateTranslation(new Vector3(0, -0.25f, -3.4f)) *
Matrix.CreateRotationX(tailRotorAngle) *
Matrix.CreateTranslation(new Vector3(0, 0.25f, 3.4f));
world = Matrix.CreateRotationY(angle) * Matrix.CreateTranslation(location);
DrawModel(helicopterModel, world, meshWorlds, view, projection);
base.Draw(gameTime);
}

100. Mesh-by-Mesh Animation
• New Draw() method
protected override void Draw(GameTime gameTime)
{
GraphicsDevice.Clear(Color.CornflowerBlue);
Matrix[] meshWorlds = new Matrix[3];
meshWorlds[0] = Matrix.CreateTranslation(new Vector3(0, 0, 0));
meshWorlds[1] = Matrix.CreateRotationY(mainRotorAngle);
meshWorlds[2] = Matrix.CreateTranslation(new Vector3(0, -0.25f, -3.4f)) *
Matrix.CreateRotationX(tailRotorAngle) *
Matrix.CreateTranslation(new Vector3(0, 0.25f, 3.4f));
world = Matrix.CreateRotationY(angle) * Matrix.CreateTranslation(location);
DrawModel(helicopterModel, world, meshWorlds, view, projection);
base.Draw(gameTime);
}

101. Mesh-by-Mesh Animation
• New Draw() method
protected override void Draw(GameTime gameTime)
{
GraphicsDevice.Clear(Color.CornflowerBlue);
Matrix[] meshWorlds = new Matrix[3];
meshWorlds[0] = Matrix.CreateTranslation(new Vector3(0, 0, 0));
meshWorlds[1] = Matrix.CreateRotationY(mainRotorAngle);
meshWorlds[2] = Matrix.CreateTranslation(new Vector3(0, -0.25f, -3.4f)) *
Matrix.CreateRotationX(tailRotorAngle) *
Matrix.CreateTranslation(new Vector3(0, 0.25f, 3.4f));
world = Matrix.CreateRotationY(angle) * Matrix.CreateTranslation(location);
DrawModel(helicopterModel, world, meshWorlds, view, projection);
base.Draw(gameTime);
}

102. Mesh-by-Mesh Animation
• Creating a new DrawModel() method as we did before
private void DrawModel(Model model, Matrix world, Matrix[] meshWorlds, Matrix view, Matrix
projection)
{
for (int index = 0; index < model.Meshes.Count; index++)
{
ModelMesh mesh = model.Meshes[index];
foreach (BasicEffect effect in mesh.Effects)
{
effect.EnableDefaultLighting();
effect.World = mesh.ParentBone.Transform * meshWorlds[index] * world;
effect.View = view;
effect.Projection = projection;
}
mesh.Draw();
}
}

103. Mesh-by-Mesh Animation
• Creating a new DrawModel() method as we did before
private void DrawModel(Model model, Matrix world, Matrix[] meshWorlds, Matrix view, Matrix
projection)
{
for (int index = 0; index < model.Meshes.Count; index++)
{
ModelMesh mesh = model.Meshes[index];
foreach (BasicEffect effect in mesh.Effects)
{
effect.EnableDefaultLighting();
effect.World = mesh.ParentBone.Transform * meshWorlds[index] * world;
effect.View = view;
effect.Projection = projection;
}
mesh.Draw();
}
}

104. Mesh-by-Mesh Animation
• Creating a new DrawModel() method as we did before
private void DrawModel(Model model, Matrix world, Matrix[] meshWorlds, Matrix view, Matrix
projection)
{
for (int index = 0; index < model.Meshes.Count; index++)
{
ModelMesh mesh = model.Meshes[index];
foreach (BasicEffect effect in mesh.Effects)
{
effect.EnableDefaultLighting();
effect.World = mesh.ParentBone.Transform * meshWorlds[index] * world;
effect.View = view;
effect.Projection = projection;
}
mesh.Draw();
}
}

105. Mesh-by-Mesh Animation
• Test it live
• “App1-Mesh-by-MeshAnimation”