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The last chapter looked at expressions. Expressions return values, but they can also have side effects. A side effect is an action that affects the state of the program. Many expressions are evaluated only for their side effects. You can create a statement from an expression by placing a statement terminator (semicolon) after it. Any value returned by the expression is discarded. For example, the following code shows an expression statement. It consists of the assignment expression (an assignment operator and two operands) followed by a semicolon. This does the following two things: The expression assigns the value on the right of the operator to the memory location referenced by variable x. In fact this is probably the main reason for the statement, this is considered the side effect. After setting the value of x, the expression returns with the new value of x. But there is nothing to receive this return value, so it is ignored. x = 10; The whole reason for evaluating the expression was to achieve the side effect.

The WSDL 1.1 specification that describes the complete document structure can be found at http://www.w3.org/TR/wsdl. It is worth looking at the original specification because you will find useful elements that you can use even though they are not widely known or even generated using GUI tools such as Visual Studio .NET. For example, the <operation> element contains a child element called <documentation> that allows you to insert an English language description of what the operation does. Here is an example: <operation name="RequestQuote"> <documentation> Returns a delayed 30-minute quote for a given stock ticker symbol. This operation returns a Quote XML type as defined in the XSD schema at: http://www.bluestonepartners.com/schemas/StockTrader.xsd </documentation> <input message="s1:RequestQuoteSoapIn" /> <output message="s1:RequestQuoteSoapOut" /> </operation> The <documentation> element adds a welcome level of readability to the WSDL document, which is challenging at best to read with human eyes. If you were to distill a WSDL document down to its most basic set of associated elements, it would look like this: <definitions> <types /> <message /> <operation> <message /> </operation> <portType> <operation /> </portType>

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Vector4 mirrorPlaneCoeffs = new Vector4(mirrorPlane.Normal, mirrorPlane.D); Vector4 clipPlaneCoeffs = Vector4.Transform(-mirrorPlaneCoeffs, invCamMatrix); clipPlane = new Plane(clipPlaneCoeffs); } First you calculate this inverse-transpose matrix. Next, you retrieve the four coefficients of your mirror plane, defined in 3D. You map them to clip space by transforming them with the inverse-transpose matrix, and you use the resulting coefficients to create the clipping plane. Note the sign indicates which side of the plane should be culled away. This all has to do with the direction of the normal of the plane, which is defined by the order in which you defined the points p0, p1, p2, and p3 you used to define the plane. Since this clipPlane variable depends on the viewMatrix, it should be updated every time the position of the camera changes, so call it from within the Update method: UpdateClipPlane(); All you need to do next is pass the clip plane to your graphics card and activate it before you render your scene as seen by your mirror camera. Remember to disable it before rendering the scene as seen by the normal camera, because the objects behind the mirror could be in sight of the normal camera and thus should be displayed: //render scene as seen by mirror into render target device.SetRenderTarget(0, renderTarget); device.Clear(ClearOptions.Target | ClearOptions.DepthBuffer, Color.CornflowerBlue, 1, 0); device.ClipPlanes[0].Plane = clipPlane; device.ClipPlanes[0].IsEnabled = true; RenderScene(mirrorViewMatrix, fpsCam.ProjectionMatrix); device.ClipPlanes[0].IsEnabled = false;

internal static SwitchableObject NewSwitchableChild() { return DataPortal.Create<SwitchableObject>( new ChildCriteria()); } public static SwitchableObject GetSwitchableRoot(int id) { return DataPortal.Create<SwitchableObject>( new RootCriteria(id)); } internal static SwitchableObject GetSwitchableChild( SqlDataReader dr) { return new SwitchableObject(dr);

Summary

s In many cases, applications must be built without the option of altering the structure of the database, or Tip even its stored procedures. When that happens, all of the ORM logic must be written within the business objects. The end result is the same; it s merely a matter of where the ORM logic resides.

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