ASP.NET Web PDF Document Viewer/Editor Control Library

This example is shown in Figure 11-9 Obviously, you need to know how much to deviate each normal beforehand Therefore, the required normal deviations are stored in a normal map, which accompanies a texture This is why you needed to calculate the tangent, binormal, and normal vectors for each vertex In such a normal map, each pixel stores the x, y, and z components of the new surface normal inside its R, G, and B color channels Notice that the normal x, y, and z axes aren t on the world coordinates Instead, they re placed in the tangent base coordinates This way, the normal map is independent of the surface and can be applied to any type of object.

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When annotations are available, we annotate the implementation classes that are to be transactional by using the org.springframework.transaction.annotation.Transactional annotation. This is the @Transactional annotation seen at the top of Listing 5-2. Strictly speaking, my earlier statement was wrong: we do not want all of the methods in our implementation to be transactional. The set methods for the properties cannot fail, because they merely assign a value to a private field, so making them transactional holds no benefit. On the other hand, the overhead associated with invoking them in a transactional mode is likely to be quite low. In our implementation, we ignore the minor overhead and wrap these methods in a redundant transaction anyway. If we did have methods that would incur significant overhead in a transactional mode, or for which transactionality was actively undesirable, we could avoid the problem by annotating the individual methods instead of the class as a whole as being transactional. An example of the alternative approach of individual method annotations is shown in Listing 5-4.

One of the weaknesses of the normal mapping technique is that when the surface is visualized from grazing angles (the angle between the surface normal and a viewer close to 90 degrees), the illusion of normal mapping disappears, and the surface will seem flat..

@Transactional public void updateTimesheet(final Timesheet timesheet) { timesheetDao.update(timesheet); emailDao.sendTimesheetUpdate(timesheet); } The configuration file entry that enables the use of annotations is really quite remarkably simple. You must declare a transaction manager bean. This is what Spring will use to begin, commit, and roll back your transactions. In a full Java EE environment, you should use the JtaTransactionManager, as shown in Listing 5-5. This will orchestrate transactions for all the relevant transactional resources running within the container, regardless of whether they are running within Spring.

Figure 11-9. Texturing only (left) and texturing plus normal mapping (right) The terrain effect you ll create for terrain rendering in the next section will support two omnidirectional light sources and multitexturing with four diffuse textures, as this is not so difficult to implement and already provides a nice final result. Later in the chapter, you will expand the effect by adding normal mapping.

<bean id="txManager" class="org.springframework.transaction.jta.JtaTransactionManager"/> In an environment where JTA transactions are not available (for example, when running within Tomcat), you will want to configure the DataSourceTransactionManager shown in Listing 5-6. This will manage transactions for any class that uses the DataSourceUtils helper class to manage transactions, which is the case for the JdbcTemplate class used by the JdbcDaoSupport helper class.

To begin creating the terrain effect that uses multitexturing, open a new file and name it Terrain.fx. As good practice, you should start by defining the uniform variables. Remember from the discussion in 9 that these uniform variables should be set by XNA before the rendering operation starts and remain constant during the rendering of one frame. Also remember that they are globally accessible by your shaders. Add the following to the top of your Terrain.fx file: // ------------------------------------------------// Matrices // ------------------------------------------------float4x4 matW : World; float4x4 matVI : ViewInverse; float4x4 matWVP : WorldViewProjection; // Materials // ------------------------------------------------float3 diffuseColor; float3 specularColor; float specularPower;

<bean id="txManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager"> <property name="dataSource" ref="dataSource"/> </bean> Finally, for a Hibernate application in which you are unable to use JTA transactions, you will need to configure a HibernateTransactionManager bean so that the appropriate session methods are called to flush pending persistence operations out to the database before committing the transaction. Listing 5-7 shows the configuration of a transaction manager for use with Hibernate.