XNA 4.0 3D顶点的例子 [英] Xna 4.0 3D Vertex example

问题描述

我目前正在由里默在辅导相结合的两个三角形，就像做一个简单的方形（的链接到补习），但由于很多已经从3.X变为4.0，我觉得很难。 我也想知道如何纹理这个广场，因此，如果有人可以帮助我，使一些示例或任何，我会AP preciate吧：）

I'm currently trying to make a simple square by combining two triangles, like in the tutorials by Riemer (Link to tutorial), but since a lot has changed from 3.x to 4.0, I find it difficult. I would also like to know how to texture this "square", so if anyone could help me by giving some example or whatsoever, I would appreciate it :)

谢谢！

• 基本

推荐答案

下面是一个例子XNA 4.0程序，绘制一个简单的纹理的正方形。它需要绿色凝胶-X结构（从维基公地 - 在code链接）添加到内容项目（或用自己的纹理取代）。经过纹理方绘制一个正方形线框绘制在上面，所以你可以看到三角形。本例中使用的效果文件的正投影和BasicEffect代替，但在其他方面类似于您链接到的里默教程

Here is an example XNA 4.0 program that draws a simple textured square. It requires the Green-gel-x texture (from wiki-commons - link in code) added to the content project (or replaced with your own texture). After the textured square is drawn, a wireframe square is drawn over the top so you can see the triangles. This example uses an orthographic projection and a BasicEffect instead of an effect file but is otherwise similar to the Riemer tutorial you linked to.

要执行的每个顶点需要一个纹理坐标的纹理。对于平铺一旦穿过广场纹理坐标的表面纹理（0,0）为左上顶点和（1，1）为右下顶点等等。如果你想平铺整个广场纹理两次，你可以设置，而不是1所有的右下角纹理坐标2。

To perform the texturing each vertex requires a texture coordinate. For a texture that tiles once across the surface of the square the texture coordinates are (0, 0) for the top left vertex and (1, 1) for the bottom right vertex and so on. If you wanted to tile the texture across the square twice, you could set all the bottom right texture coordinates to 2, instead of 1.

using Microsoft.Xna.Framework;
using Microsoft.Xna.Framework.Graphics;
using Microsoft.Xna.Framework.Input;

namespace WindowsGame
{
    public class Game1 : Microsoft.Xna.Framework.Game
    {
        const string TEXTURE_NAME = "Green-gel-x";  // http://upload.wikimedia.org/wikipedia/commons/9/99/Green-gel-x.png
        const int TOP_LEFT = 0;
        const int TOP_RIGHT = 1;
        const int BOTTOM_RIGHT = 2;
        const int BOTTOM_LEFT = 3;
        RasterizerState WIREFRAME_RASTERIZER_STATE = new RasterizerState() { CullMode = CullMode.None, FillMode = FillMode.WireFrame };

        GraphicsDeviceManager graphics;
        BasicEffect effect;
        Texture2D texture;
        VertexPositionColorTexture[] vertexData;
        int[] indexData;
        Matrix viewMatrix;
        Matrix projectionMatrix;

        public Game1()
        {
            graphics = new GraphicsDeviceManager(this);
            Content.RootDirectory = "Content";
        }

        protected override void Initialize()
        {
            effect = new BasicEffect(graphics.GraphicsDevice);

            SetUpVertices(Color.White);
            SetUpCamera();
            SetUpIndices();

            base.Initialize();
        }

        private void SetUpVertices(Color color)
        {
            const float HALF_SIDE = 200.0f;
            const float Z = 0.0f;

            vertexData = new VertexPositionColorTexture[4];
            vertexData[TOP_LEFT] = new VertexPositionColorTexture(new Vector3(-HALF_SIDE, HALF_SIDE, Z), color, new Vector2(0, 0));
            vertexData[TOP_RIGHT] = new VertexPositionColorTexture(new Vector3(HALF_SIDE, HALF_SIDE, Z), color, new Vector2(1, 0));
            vertexData[BOTTOM_RIGHT] = new VertexPositionColorTexture(new Vector3(HALF_SIDE, -HALF_SIDE, Z), color, new Vector2(1, 1));
            vertexData[BOTTOM_LEFT] = new VertexPositionColorTexture(new Vector3(-HALF_SIDE, -HALF_SIDE, Z), color, new Vector2(0, 1));
        }

        private void SetUpIndices()
        {
            indexData = new int[6];
            indexData[0] = TOP_LEFT;
            indexData[1] = BOTTOM_RIGHT;
            indexData[2] = BOTTOM_LEFT;

            indexData[3] = TOP_LEFT;
            indexData[4] = TOP_RIGHT;
            indexData[5] = BOTTOM_RIGHT;
        }

        private void SetUpCamera()
        {
            viewMatrix = Matrix.Identity;
            projectionMatrix = Matrix.CreateOrthographic(Window.ClientBounds.Width, Window.ClientBounds.Height, -1.0f, 1.0f);
        }

        protected override void LoadContent()
        {
            texture = Content.Load<Texture2D>(TEXTURE_NAME);
        }

        protected override void Update(GameTime gameTime)
        {
            if (GamePad.GetState(PlayerIndex.One).Buttons.Back == ButtonState.Pressed)
                this.Exit();

            base.Update(gameTime);
        }

        protected override void Draw(GameTime gameTime)
        {
            GraphicsDevice.Clear(Color.CornflowerBlue);

            // Draw textured box
            GraphicsDevice.RasterizerState = RasterizerState.CullNone;  // vertex order doesn't matter
            GraphicsDevice.BlendState = BlendState.NonPremultiplied;    // use alpha blending
            GraphicsDevice.DepthStencilState = DepthStencilState.None;  // don't bother with the depth/stencil buffer

            effect.View = viewMatrix;
            effect.Projection = projectionMatrix;
            effect.Texture = texture;
            effect.TextureEnabled = true;
            effect.DiffuseColor = Color.White.ToVector3();
            effect.CurrentTechnique.Passes[0].Apply();

            GraphicsDevice.DrawUserIndexedPrimitives(PrimitiveType.TriangleList, vertexData, 0, 4, indexData, 0, 2);

            // Draw wireframe box
            GraphicsDevice.RasterizerState = WIREFRAME_RASTERIZER_STATE;    // draw in wireframe
            GraphicsDevice.BlendState = BlendState.Opaque;                  // no alpha this time

            effect.TextureEnabled = false;
            effect.DiffuseColor = Color.Black.ToVector3();
            effect.CurrentTechnique.Passes[0].Apply();

            GraphicsDevice.DrawUserIndexedPrimitives(PrimitiveType.TriangleList, vertexData, 0, 4, indexData, 0, 2);

            base.Draw(gameTime);
        }
    }
}

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