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Next, you start the effect. Advanced effects can have multiple passes. Although the BasicEffect effect has only one pass, it s good practice to always loop through all the possible passes. Once the pass has started, you first need to pass the VertexDeclaration so your graphics card knows which data is contained in the vertices. Finally, you call the device.DrawUserPrimitives method to render your triangle. The DrawUserPrimitives method takes four arguments. First you need to specify whether you want to render triangles, lines, or points, as well as how they are stored in the array (see the following six sections). Next, you need to pass the array you used to store your vertices. The third argument allows you to specify at which vertex inside the array the graphics card should start drawing from. Because here you want to start drawing from the very first vertex in your array, you specify 0. Finally, you indicate how many primitives XNA should render from the array. Since you ve stored only three vertices in the array, you can expect XNA to render only one triangle from them. Running this code will render your triangle to the screen! As you can see, each corner of the triangle is rendered in the color you specified, with the colors linearly shifted between the corners.

Note The device.RenderState.CullMode = CullMode.None code disables culling (see recipe 5-6).

Figure 4-4. New code contract tab Check the box marked Perform Runtime Contract Checking and run the code. You should receive an error message similar to that shown in Figure 4-5.

Culling can prevent triangles from being drawn, so when beginning 3D programming, you should turn if off.

Enabling Code Contract Static Verification (Premium/Ultimate Edition Only)

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protected override void UnLoadContent(bool unloadAllContent) { if (unloadAllContent == true) { content.Unload(); } } User input that moves the camera will make you want to change the View matrix, so an ideal moment to change it is in the update phase. protected override void Update(GameTime gameTime) { if (GamePad.GetState(PlayerIndex.One).Buttons.Back == ButtonState.Pressed) this.Exit(); Vector3 camPosition = new Vector3(10, 10, -10); Vector3 camTarget = new Vector3(0, 0, 0); Vector3 camUpVector = new Vector3(0, 1, 0); viewMatrix = Matrix.CreateLookAt(camPosition, camTarget, camUpVector); base.Update(gameTime); } Then pass the Projection and View matrices to the Effect that will be drawing the scene: protected override void Draw(GameTime gameTime) { graphics.GraphicsDevice.Clear(Color.CornflowerBlue); basicEffect.World = Matrix.Identity; basicEffect.View = viewMatrix; basicEffect.Projection = projectionMatrix; basicEffect.Begin(); foreach (EffectPass pass in basicEffect.CurrentTechnique.Passes) { pass.Begin(); cCross.DrawUsingPresetEffect(); pass.End(); } basicEffect.End(); base.Draw(gameTime); } } }

To enable static verification, you need to go into the project Properties screen, select the Code Contract tab, and ensure that the static checking option is selected. When you compile your applications now, you should see the contracts are checked at compile time. You might ask why static verification is not always on One reason is that if you are writing unit tests, you might want to pass null values into your methods and ensure that your code handles them correctly. If static verification was always on, you could not run your unit tests.

In this chapter, you have learned how to use the rich functionality within Microsoft s Visual Web Developer (VWD) to create blocks using the Popfly Block SDK. You ve learned how to edit a block s JavaScript file and block definition files in its editor. You ve also learned about VWD s debugging capabilities and how to use the Block SDK schema files to help write and validate block definition files. In the next chapter, we ll return to the Popfly web site and explore the Popfly block creation area.

The previous two matrices are all XNA needs to correctly render your 3D scene to the 2D window on your screen. Going from 3D to 2D involves certain challenges, which are all taken care of by XNA. However, a clear understanding of what is going on under the hood is necessary if you want to be able to create and debug medium-sized to large 3D applications.

You should note that contracts are inherited between classes, but it is not possible to add additional preconditions.

The Z-Buffer (or Depth Buffer)

Behind the scenes, code contracts rewrite the generated IL. At a high level, you can divide code contract architecture into three main components: Static method (expresses assumptions and constraints; you will look at them shortly) Binary rewriter (performs runtime checks) Static checker (verifies assumptions at compile time; TFS edition only)

A first challenge lies in specifying which object of your 3D scene will occupy a certain pixel of the final image. When going from 3D space to 2D window space, there can be multiple objects that you want displayed on the same pixel, as shown in Figure 2-3. A pixel on your 2D window corresponds to a ray of points in your 3D world, which is explained in more detail in recipe 4-14. For one pixel, this ray is shown as the dotted line in Figure 2-3, which hits two objects. In this case, the pixel should obviously get the color of object A, since object A is closer to the camera than object B.

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