"Welcome to the 3D world"
Before we start writing 3d methods, I'm going to explain some basic concepts in 3D space..
When we say 3D, we're talking about x,y,z. A model or game object will have 3d position and 3d rotation. Please see attached image.
Example, try looking in the image. Move your body to your right, left. Look up, down. Move your head closer to the monitor, farther..
X = left/ right
Y = down/ up
Z = zoom/scale
Let's start making a game using 3 Dimensions. Create a new project, call it myFirst3dGame
Step 1 : Download and importing the Content files.
house modelStep 2: Creating a class for your gameObject
On your solutionExplorer (View > Solution Explorer)
Right click Your myFirst3dGame project > Add > new class.. Name it gameObject
[The look of our solution so far]
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using Microsoft.Xna.Framework;
using Microsoft.Xna .Framework .Graphics ;
namespace myFirst3dGame
{
class gameObject
{
public Vector3 position = Vector3 .Zero ;
public Vector3 rotation = Vector3.Zero;
public Model model;
public bool alive = true;
public Vector3 velocity = Vector3.Zero;
}
}
As you can see, instead of using vector2, we used vector3 for the position and even the rotation. We need to take the Z axis in our account. Model is the data type of 3D model.
Now go to your Game1.cs..
Step 3: Declaring your variables.
At the top of your class, declare:
gameObject house;
Matrix projectionMatrix; //projection matrix is usually used for camera. Matrix are used for viewing purposes.
Go to your loadcontent and set up the values of variables..
house = new gameObject();
house.alive =true;
house.model = Content.Load("house");
projectionMatrix = Matrix.CreatePerspectiveFieldOfView(MathHelper.ToRadians (45f), GraphicsDevice.Viewport.AspectRatio, 1, 700f); // Create a perspective field of view in Y position, set to 45f degrees and convert to radians.
//1 is the near sight position, and 700f farplane
house.position.Z = -30;
At your Draw method
foreach (ModelMesh mesh in house.model.Meshes) //for each mesh in house meshes
{
foreach (BasicEffect effect in mesh.Effects) //for each basic effect in house meshes
{
effect.View = Matrix.Identity ; //Set view to default
effect.World = Matrix.CreateTranslation(house.position) * Matrix.CreateRotationX(house.rotation.Y); //translate the object to the 3d space
effect.EnableDefaultLighting(); //enable default light sources
effect.Projection = projectionMatrix; //project the model according to the value of gameobject
}
mesh.Draw(); //draw the mesh
}
RUN THE GAME!!
[Welcome to the 3D World]
SOURCE CODE
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;
namespace myFirst3dGame
{
public class Game1 : Microsoft.Xna.Framework.Game
{
GraphicsDeviceManager graphics;
SpriteBatch spriteBatch;
gameObject house;
Matrix viewMatrix, projectionMatrix;
Vector3 cameraPosition;
public Game1()
{
graphics = new GraphicsDeviceManager(this);
Content.RootDirectory = "Content";
}
protected override void Initialize()
{
// TODO: Add your initialization logic here
base.Initialize();
}
protected override void LoadContent()
{
spriteBatch = new SpriteBatch(GraphicsDevice);
house = new gameObject();
house.model = Content.Load("house");
projectionMatrix = Matrix.CreatePerspectiveFieldOfView(MathHelper.ToRadians (45f), GraphicsDevice.Viewport.AspectRatio, 1, 700f);
house.position.Z = -30;
}
protected override void UnloadContent()
{
}
protected override void Update(GameTime gameTime)
{
base.Update(gameTime);
}
protected override void Draw(GameTime gameTime)
{
GraphicsDevice.Clear(Color.CornflowerBlue);
foreach (ModelMesh mesh in house.model.Meshes)
{
foreach (BasicEffect effect in mesh.Effects)
{
effect.View = Matrix.Identity ;
effect.World = Matrix.CreateTranslation(house.position) * Matrix.CreateRotationX(house.rotation.Y);
effect.EnableDefaultLighting();
effect.Projection = projectionMatrix;
}
mesh.Draw();
}
base.Draw(gameTime);
}
}
}
Download the source code here.
