Getting Started with XBOX 360 game development using Microsoft XNA.
Part IV
This month we`ll
discuss about the code and steps to draw a 3d model in a XBOX360 game.
This will be the
first step to develop games like Halo3 or GTAIV for the XBOX360 console.
First you need to
use 3d modeling software like 3ds max of Maya to create 3d models.
Then you can
export those models to the .x or .fbx format.
Steps to convert
3d model in to binary file was explained in my previous article.
After you convert
the model you can load that file to the content folder.
Right click on the content folder and Add->existing items
And select that
file form the hard drive.
It could be .x
and .fbx.
Now in the Game
1.cs you need to write code to draw 3D model in the screen.
Model mymodel;
Then in the LoadContent() method you can load the image.
mymodel = Content.Load<Model>("car");
then in the Draw() method you can draw the model in the screen.
//create a new matrix and copy that tranfomation to 3d model
Matrix[] transforms = new Matrix[mymodel.Bones.Count];
//copy the absolute transforms to the car model.
mymodel.CopyAbsoluteBoneTransformsTo(transforms);
//use two foreach loops to loop through the mesh and mesh effect
foreach (ModelMesh
mesh in mymodel.Meshes)
{
foreach (BasicEffect
effect in mesh.Effects)
{
//enable default lighting provides by XNA.
effect.EnableDefaultLighting();
//define the world
matrix to locate the position
effect.World =
transforms[mesh.ParentBone.Index];
//define view matrix to set up the camara location
effect.View = Matrix.CreateLookAt(new
Vector3(550, 20
new
Vector3(0, 300, 0), Vector3.Up);
//define projection matrix to model projection ,aspect ratio,
and near and far plane distance.
effect.Projection = Matrix.CreatePerspectiveFieldOfView(1,4.0f/3.0f,
1, 10000); ;
}
mesh.Draw();
//draw the matrix
Final code of Game1.cs
/*
content created by -uditha sampath bandara
udithamail@yahoo.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 _3d_in_XNA
{
/// <summary>
/// This is
the main type for your game
/// </summary>
public class
Game1 : Microsoft.Xna.Framework.Game
{
GraphicsDeviceManager
graphics;
SpriteBatch
spriteBatch;
Model
mymodel;//create model object
public
Game1()
{
graphics = new
GraphicsDeviceManager(this);
Content.RootDirectory = "Content";
}
/// <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()
{
}
/// <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);
mymodel = Content.Load<Model>("car");// load the car model
//set the
scale as 15 in the model properties
}
/// <summary>
/// UnloadContent will be called once per game and is the
place to unload
/// all content.
/// </summary>
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();
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);
Matrix[]
transforms = new Matrix[mymodel.Bones.Count];//create a new matrix and copy that tranfomation to 3d
model
mymodel.CopyAbsoluteBoneTransformsTo(transforms);
//use two
for each loop acess model mesh and its effects
foreach
(ModelMesh mesh in
mymodel.Meshes)
{
{
effect.EnableDefaultLighting();
effect.World =
transforms[mesh.ParentBone.Index];//add varible to change the rotation of the model
// effect.World
defines the world matrix
effect.View = Matrix.CreateLookAt(new Vector3(550, 200, 600), new Vector3(0, 300, 0),Vector3.Up);
//define view matrix to
set up the camara location
effect.Projection = Matrix.CreatePerspectiveFieldOfView(1,4.0f/3.0f,1,
10000);
//define projection
matrix to crate distance to the model
}
mesh.Draw();//draw the matrix
base.Draw(gameTime);
}
}
}
Modify the code for 3d animation.
Also you can
create a 3d animation to this example using these lines of codes.
First initilize a
float variable to the animation.
float time;
then in Update()
method get new values.
time = (float)gameTime.TotalGameTime.TotalSeconds;
finally in the Draw()method add the time variable to change the rotation.
effect.World =
transforms[mesh.ParentBone.Index] *Matrix.CreateRotationY(time
* 0.42f);
then after you
press F5 you are ready to play the animation.
Final code of Game1.cs with a 3d animation
/*
content created by -uditha sampath bandara
udithamail@yahoo.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 _3d_in_XNA
{
/// <summary>
/// This is
the main type for your game
/// </summary>
public class
Game1 : Microsoft.Xna.Framework.Game
{
GraphicsDeviceManager
graphics;
SpriteBatch
spriteBatch;
Model
mymodel;//create model object
float
time; //use
for 3d animation
public
Game1()
{
graphics = new
GraphicsDeviceManager(this);
Content.RootDirectory = "Content";
}
/// <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()
{
}
/// <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);
mymodel = Content.Load<Model>("car");// load the car model
//set the
scale as 15 in the model properties
}
/// <summary>
/// UnloadContent will be called once per game and is the
place to unload
/// all content.
/// </summary>
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();
time = (float)gameTime.TotalGameTime.TotalSeconds;//get time form the game time
}
/// <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);
Matrix[]
transforms = new Matrix[mymodel.Bones.Count];//create a new matrix and copy that tranfomation to 3d
model
mymodel.CopyAbsoluteBoneTransformsTo(transforms);
foreach
(ModelMesh mesh in
mymodel.Meshes)
{
foreach
(BasicEffect effect in
mesh.Effects)
{
effect.EnableDefaultLighting();
effect.World =transforms[mesh.ParentBone.Index]
*Matrix.CreateRotationY(time * 0.42f);
//add varible to change the rotation of the model
// effect.World defines
the world matrix
effect.View = Matrix.CreateLookAt(new Vector3(550,
200, 600),new Vector3(0,
300, 0),Vector3.Up);
//define view matrix to
set up the camara location
effect.Projection = Matrix.CreatePerspectiveFieldOfView(1,4.0f/3.0f,1,
10000);
//define projection
matrix to crate distance to the model
}
mesh.Draw();//draw the matrix
base.Draw(gameTime);
}
}
}
This is the end
of the draw 3d model and 3d animation tutorial.
Form next tutorial you learn about working with XBOX360 joystick using XNA.
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