Getting Started with XNA Game Studio 3.0 to develop video games
Part VIII.
Model model,
colide_car, land; // Initialize 3d model variables
Texture2D sunset; //
Initialize texture variable
KeyboardState
lastKeyboardState;// Initialize keyboard
float distance=
0.0f; //
set distance to zero
float distance_left =
0.0f; // set distance_left to zero
bool active = false; // set active to false
float change_dir = 0.0f; // set change_dir to zero;
Now
in the LoadContent() method
write code for loading the assest
model =
Content.Load<Model>("car"); //load
the player car model
colide_car =
Content.Load<Model>("car");//load
the AI car model
land =
Content.Load<Model>("floor"); //load the land
model
sunset =
Content.Load<Texture2D>("sunset");//load
the 2d
Then in the Update() method
you can write this code segment.
lastKeyboardState
= Keyboard.GetState();// get the user keyboard
if
(lastKeyboardState.IsKeyDown(Keys.Up)) //chack whether user
{
distance = distance + 2.8f; // increase
distance
}
if
(lastKeyboardState.IsKeyDown(Keys.Down))//chack whether user
{
distance = distance - 2.8f; //decrease distance
}
if
(lastKeyboardState.IsKeyDown(Keys.Left))//chack whether user
{
distance_left =
distance_left + 0.03f; // increase distance_left
}
if
(lastKeyboardState.IsKeyDown(Keys.Right))//chack whether user press
RIGHT
{
distance_left = distance_left - 0.03f;//decrease distance_left
}
In the Draw () method you can
see the Changes by drawing the images and models.
GraphicsDevice device =
graphics.GraphicsDevice; //set the device to the
current graphic device
Viewport
viewport = device.Viewport; // set the viewport to
the current device viewport
spriteBatch.Begin(); //begin the
spitebatch process
spriteBatch.Draw(sunset, new Vector2(0.0f,
0.0f), Color.White); //draw the image in 0,0 location
spriteBatch.End(); //end the spite
batch process
float aspectRatio = (float)viewport.Width / (float)viewport.Height;
//set the aspectRatio
// Create camera matrices with substracting
distance
Matrix world = Matrix.CreateRotationY(-20.42f) *
Matrix.CreateTranslation(2000.0f-distance,
0.0f, 0.0f)
*Matrix.CreateRotationY(distance_left);
// Create view
Matrix view = Matrix.CreateLookAt(new
Vector3(3750,800, 60),
new Vector3(0,
300, 0),Vector3.Up);
// Create projection
Matrix projection = Matrix.CreatePerspectiveFieldOfView(1,
aspectRatio, 1, 100000);
// create transform
Matrix
Matrix[]
transforms = new Matrix[model.Bones.Count];
model.CopyAbsoluteBoneTransformsTo(transforms);
//
Draw the main car.
foreach (ModelMesh mesh in
model.Meshes)
{
foreach (BasicEffect effect in
mesh.Effects)
{
effect.World =
transforms[mesh.ParentBone.Index] * world;
effect.View = view;
effect.Projection
= projection;
effect.LightingEnabled = true;
effect.DirectionalLight0.Enabled = true;
effect.DirectionalLight0.Direction = Vector3.Left;
//set the directinal lighting
effect.DirectionalLight0.DiffuseColor = Vector3.One;
GraphicsDevice.RenderState.DepthBufferEnable
= true; //set the grapics card rendering to depthbuffer enable
GraphicsDevice.RenderState.AlphaBlendEnable = false;
GraphicsDevice.RenderState.AlphaTestEnable
= false;
}
mesh.Draw(); // draw
the player car
}
// For the AI car
add the change_dir
Matrix world2 = Matrix.CreateRotationY(0.42f) *
Matrix.CreateTranslation(100.0f,
0.0f, 0.0f+change_dir);
Matrix[]
transforms2 = new Matrix[colide_car.Bones.Count];
colide_car.CopyAbsoluteBoneTransformsTo(transforms2);
// Draw the AI car.
foreach (ModelMesh mesh in
colide_car.Meshes)
{
foreach (BasicEffect effect in
mesh.Effects)
{
effect.World =
transforms2[mesh.ParentBone.Index] * world2;
effect.View = view;
effect.Projection = projection;
effect.LightingEnabled = true;
effect.DirectionalLight0.Enabled = true;
effect.DirectionalLight0.Direction = Vector3.Left; //set the
directinal lighting
effect.DirectionalLight0.DiffuseColor = Vector3.One;
GraphicsDevice.RenderState.DepthBufferEnable =
true; //set the
grapics card rendering to depthbuffer enable
GraphicsDevice.RenderState.AlphaBlendEnable = false;
GraphicsDevice.RenderState.AlphaTestEnable
= false;
}
mesh.Draw(); //draw
the AI car
}
#region chack coolition
//collition
detection
//Create
a BoundingSphere for car1 with its center point and meshes BoundingSphere
radies
BoundingSphere car1 = new BoundingSphere(new Vector3(2000.0f
- distance, 0.0f, 0.0f), model.Meshes[0].BoundingSphere.Radius * 0.95f);
//Create
a BoundingSphere for car2 with its center point and mesh BoundingSphere radies
BoundingSphere car2 = new BoundingSphere(new
Vector3(100.0f, 0.0f, 0.0f+change_dir),
colide_car.Meshes[0].BoundingSphere.Radius*0.95f);
if
(car2.Intersects(car1)) //chack whather car1 and AI
car(car2) intersects
{
active = true; //then set active
true
}
if (active == false) //when active false
{
change_dir = 0.0f; //set change_dir to zero
}
else
{
change_dir = change_dir + 4.8f; // or increment the value
}
#endregion
#region draw land
//set the transforms Matrix
Matrix[]
transforms3 = new Matrix[land.Bones.Count];
land.CopyAbsoluteBoneTransformsTo(transforms3);
foreach (ModelMesh mesh in
land.Meshes)
{
foreach (BasicEffect effect in
mesh.Effects)
{
effect.World =
transforms[mesh.ParentBone.Index] * Matrix.CreateRotationX(4.7f) *Matrix.CreateTranslation(400.0f,0.0f,0.0f);
effect.View = view;
effect.Projection = projection;
graphics.GraphicsDevice.RenderState.DepthBufferEnable = true;
//set the grapics
card rendering to depthbuffer enable
}
mesh.Draw();
// Draw the land.
}
#endregion
Now you can run the project
by pressing F5 or by clicking the run button.
Final code of Game1.cs
/*
content created by -uditha sampath bandara
udithamail@yahoo.com
uditha.wordpress.com
*/
using System;
using
System.Collections.Generic;
using System.Linq;
using
Microsoft.Xna.Framework;
using
Microsoft.Xna.Framework.Audio;
using
Microsoft.Xna.Framework.Content;
using
Microsoft.Xna.Framework.GamerServices;
using
Microsoft.Xna.Framework.Graphics;
using Microsoft.Xna.Framework.Input;
using
Microsoft.Xna.Framework.Media;
using
Microsoft.Xna.Framework.Net;
using
Microsoft.Xna.Framework.Storage;
namespace
ligting_car_xna_3._0
{
/// <summary>
/// This is the main type for your game
/// </summary>
public class Game1 :
Microsoft.Xna.Framework.Game
{
GraphicsDeviceManager
graphics;
SpriteBatch
spriteBatch;
Model
model, colide_car, land; // Initialize 3d model variables
Texture2D
sunset; // Initialize texture variable
KeyboardState
lastKeyboardState;// Initialize keyboard
float
distance= 0.0f; // set distance to zero
float
distance_left = 0.0f; // set distance_left to zero
bool
active = false; // set active
to false
float change_dir = 0.0f; // set change_dir to zero;
public Game1()
{
Content.RootDirectory = "Content";
graphics = new
GraphicsDeviceManager(this);
}
/// <summary>
/// Allows the game to perform any initialization it needs to
before starting to run.
/// This is where it can query for any required services and
load any non-graphic
/// related content.
Calling base.Initialize will enumerate through any components
/// and initialize them as well.
/// </summary>
protected
override void
Initialize()
{
base.Initialize();
}
/// <summary>
/// LoadContent will be called once per game and is the place
to load
/// all of your content.
/// </summary>
protected
override void
LoadContent()
{
// Create
a new SpriteBatch, which can be used to draw textures.
spriteBatch = new SpriteBatch(GraphicsDevice);
model = Content.Load<Model>("car"); //load the
player car model
colide_car = Content.Load<Model>("car"); //load the AI
car model
land = Content.Load<Model>("floor"); //load the
land model
sunset = Content.Load<Texture2D>("sunset");
//load the 2d
background
}
protected
override void
UnloadContent()
{
}
//<summary>
//Allows the
game to run logic such as updating the world,
//checking
for collisions, gathering input, and playing audio.
//</summary>
// <param
name="gameTime">Provides a snapshot of timing
values.</param>
protected
override void
Update(GameTime gameTime)
{
//Allows
the game to exit
if
(GamePad.GetState(PlayerIndex.One).Buttons.Back
== ButtonState.Pressed)
this.Exit();
lastKeyboardState = Keyboard.GetState(); // get the user
keyboard state
if
(lastKeyboardState.IsKeyDown(Keys.Up)) //chack whether user press UP
{
distance = distance +
2.8f; //
increase distance
}
if
(lastKeyboardState.IsKeyDown(Keys.Down))//chack whether user press DOWN
{
distance = distance -
2.8f; //decrease
distance
}
if
(lastKeyboardState.IsKeyDown(Keys.Left))//chack whether user press LEFT
{
distance_left = distance_left +
0.03f; // increase
distance_left
}
if
(lastKeyboardState.IsKeyDown(Keys.Right))//chack whether user press RIGHT
{
distance_left = distance_left -
0.03f;//decrease distance_left
}
base.Update(gameTime);
}
/// <summary>
/// This is called when the game should draw itself.
/// </summary>
/// <param
name="gameTime">Provides a
snapshot of timing values.</param>
protected
override void
Draw(GameTime gameTime)
{
GraphicsDevice.Clear(Color.Black); // clear
the graphic device
GraphicsDevice
device = graphics.GraphicsDevice; //set the device to
the current graphic device
Viewport
viewport = device.Viewport; // set the viewport to
the current device viewport
spriteBatch.Begin(); //begin the
spitebatch process
spriteBatch.Draw(sunset, new Vector2(0.0f,
0.0f), Color.White); //draw the image in 0,0 location
spriteBatch.End(); //end the spite
batch process
float
aspectRatio = (float)viewport.Width / (float)viewport.Height; //set
the aspectRatio
// Create camera matrices with substracting
distance
Matrix
world = Matrix.CreateRotationY(-20.42f) * Matrix.CreateTranslation(2000.0f-distance, 0.0f,
0.0f)
*Matrix.CreateRotationY(distance_left);
// Create view
Matrix
view = Matrix.CreateLookAt(new Vector3(3750,800,
60),
new Vector3(0,
300, 0),
Vector3.Up);
// Create projection
Matrix
projection = Matrix.CreatePerspectiveFieldOfView(1,
aspectRatio,
1, 100000);
// create
transform Matrix
Matrix[]
transforms = new Matrix[model.Bones.Count];
model.CopyAbsoluteBoneTransformsTo(transforms);
// Draw
the main car.
foreach
(ModelMesh mesh in
model.Meshes)
{
foreach
(BasicEffect effect in
mesh.Effects)
{
effect.World =
transforms[mesh.ParentBone.Index] * world;
effect.View = view;
effect.Projection =
projection;
effect.LightingEnabled = true;
effect.DirectionalLight0.Enabled = true;
effect.DirectionalLight0.Direction = Vector3.Left; //set the
directinal lighting
effect.DirectionalLight0.DiffuseColor = Vector3.One;
GraphicsDevice.RenderState.DepthBufferEnable
= true; //set the grapics card rendering to depthbuffer enable
GraphicsDevice.RenderState.AlphaBlendEnable = false;
GraphicsDevice.RenderState.AlphaTestEnable = false;
}
mesh.Draw(); // draw the player car
}
// For
the AI car add the change_dir
Matrix
world2 = Matrix.CreateRotationY(0.42f) * Matrix.CreateTranslation(100.0f, 0.0f, 0.0f+change_dir);
Matrix[]
transforms2 = new Matrix[colide_car.Bones.Count];
colide_car.CopyAbsoluteBoneTransformsTo(transforms2);
// Draw
the AI car.
foreach
(ModelMesh mesh in
colide_car.Meshes)
{
foreach
(BasicEffect effect in
mesh.Effects)
{
effect.World =
transforms2[mesh.ParentBone.Index] * world2;
effect.View = view;
effect.Projection =
projection;
effect.LightingEnabled = true;
effect.DirectionalLight0.Enabled = true;
effect.DirectionalLight0.Direction = Vector3.Left;
//set the directinal lighting
effect.DirectionalLight0.DiffuseColor = Vector3.One;
GraphicsDevice.RenderState.DepthBufferEnable = true;
//set the grapics card rendering to depthbuffer
enable
GraphicsDevice.RenderState.AlphaBlendEnable = false;
GraphicsDevice.RenderState.AlphaTestEnable = false;
}
mesh.Draw(); //draw the AI car
}
#region chack coolition
//collition
detection
//Create
a BoundingSphere for car1 with its center point and meshes BoundingSphere
radies
BoundingSphere
car1 = new BoundingSphere(new Vector3(2000.0f
- distance, 0.0f, 0.0f), model.Meshes[0].BoundingSphere.Radius * 0.95f);
//Create
a BoundingSphere for car2 with its center point and mesh BoundingSphere radies
BoundingSphere car2 = new BoundingSphere(new
Vector3(100.0f, 0.0f, 0.0f+change_dir),
colide_car.Meshes[0].BoundingSphere.Radius*0.95f);
if
(car2.Intersects(car1)) //chack whather car1 and AI
car(car2) intersects
{
active = true; //then set active true
}
if
(active == false) //when
active false
{
change_dir = 0.0f; //set change_dir to zero
else
{
change_dir = change_dir + 4.8f;
// or increment the value
#endregion
#region draw land
//set
the transforms Matrix
Matrix[]
transforms3 = new Matrix[land.Bones.Count];
land.CopyAbsoluteBoneTransformsTo(transforms3);
foreach
(ModelMesh mesh in
land.Meshes)
{
foreach
(BasicEffect effect in
mesh.Effects)
{
effect.World =
transforms[mesh.ParentBone.Index] * Matrix.CreateRotationX(4.7f)
*Matrix.CreateTranslation(400.0f,0.0f,0.0f);
effect.View = view;
effect.Projection =
projection;
graphics.GraphicsDevice.RenderState.DepthBufferEnable = true;
//set the grapics
card rendering to depthbuffer enable
}
}
#endregion
base.Draw(gameTime);
}
}
}
This is the end of the using 3d
coalition in a PC game tutorial.
Also source project is
attached with this article.(http://digit.lk/downloads/
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