三角带XNA

Question

我正在尝试学习如何使用XNA中的基元为uni项目创建3D形状。我已经找到了几个关于这个主题的教程，我认为我已经掌握了基础知识，但是当我开始在我自己的项目代码上开始时，我遇到了一个问题。首先，我试图创建一个三角形，代码如下：

public class Game1 : Microsoft.Xna.Framework.Game
{
    GraphicsDeviceManager graphics;
    SpriteBatch spriteBatch;
    VertexPositionColor[] vertices;
    VertexBuffer vertexBuffer;
    BasicEffect effect;
    Camera camera;
    public Game1()
    {
        graphics = new GraphicsDeviceManager(this);
        Content.RootDirectory = "Content";
    }

    public void setUpVertices()
    {
        vertices=new VertexPositionColor[3];
        vertices[0] = new VertexPositionColor(new Vector3(0, 1, 0), Color.Blue);
        vertices[1] = new VertexPositionColor(new Vector3(1, -1, 0), Color.Red);
        vertices[2]= new VertexPositionColor(new Vector3(-1,-1,0),Color.Green);
    }
    protected override void Initialize()
    {
        camera = new Camera(this, new Vector3(0, 0, 5),Vector3.Zero, Vector3.Up);
        Components.Add(camera);
        base.Initialize();
    }

    protected override void LoadContent()
    {
        spriteBatch = new SpriteBatch(GraphicsDevice);
        setUpVertices();
        vertexBuffer = new VertexBuffer(GraphicsDevice, typeof(VertexPositionColor), vertices.Length, BufferUsage.None);
        vertexBuffer.SetData(vertices);
        effect = new BasicEffect(GraphicsDevice);
    }

    protected override void Draw(GameTime gameTime)
    {
        GraphicsDevice.Clear(Color.CornflowerBlue);
        GraphicsDevice.SetVertexBuffer(vertexBuffer);
        effect.World = Matrix.Identity;
        effect.View = camera.view;
        effect.Projection = camera.projection;
        effect.VertexColorEnabled = true;
        foreach (EffectPass pass in effect.CurrentTechnique.Passes)
        {
            pass.Apply();
            GraphicsDevice.DrawUserPrimitives<VertexPositionColor>(PrimitiveType.TriangleStrip, vertices, 0, 1);
        }

        base.Draw(gameTime);
    }
}

代码本身编译但屏幕上没有呈现三角形，我无法弄清楚原因。

我已经按照教程说明了三角形现在应该出现在屏幕上，正确（我已经多次检查过），现在我不知道该做什么。

任何帮助或建议都会非常感激，因为我真的在努力使用三角形条带。

注意：相机类使一个简单的3D静态相机指向原点7

修改
相机构造函数的代码

public Camera(Game game, Vector3 pos, Vector3 target, Vector3 up)
: base(game)
{
    // TODO: Construct any child components here
    projection = Matrix.CreatePerspectiveFieldOfView(MathHelper.PiOver4,(float)Game.Window.ClientBounds.Width /(float)Game.Window.ClientBounds.Height,1, 100);
}

Answer 1

也许这是一个剔除问题，请尝试添加：

GraphicsDevice.RasterizerState = RasterizerState.CullNone;

Answer 2

我在相机构造函数中看不到camera.view但您使用它：effect.View = camera.view;。也许你没有设置那个变量？