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Figure 8 5. The Model, ModelMesh, and ModelMeshPart class hierarchy Contained within the model object is a property named Meshes, which provides a collection of ModelMesh objects. Each ModelMesh represents a group of triangles that are to be rendered in a single position within the object. The reason for having multiple model mesh objects is that Model objects are able to store geometry that contains complex hierarchies of parts. Imagine, for example, that you wanted to render a model of a helicopter. There are three primary parts to a helicopter model: the main body, the rotor above the body, and the tail rotor. Both of the rotors can move, relative to the helicopter, in order for them to be able to rotate. They are clearly part of the helicopter, but they cannot be rendered purely using the helicopter s transformation matrix. XNA allows each of these separate pieces of the model, called bones in XNA s terminology, to be individually transformed. This is the reason why the model is stored and rendered in multiple pieces. We won t be going into any further detail about bones and how to use them in this book, but there are plenty of references on the Internet that you should be able to find with a search engine that will give you more information if you want to investigate this subject further. Contained within the ModelMesh object is yet another collection, this time of ModelMeshPart objects and obtained from the property named MeshParts. Model mesh parts are subsections of the model mesh that collected together contain the geometry of the whole part. The reason for dividing model meshes

possible_keys: NULL key: PRIMARY key_len: 8 ref: NULL rows: 10 Extra: Using where; Using index 3 rows in set (0.28 sec)

into separate parts in this way is that each part might have parameters that differ from the other parts, such as the texture If multiple textures are used within a model, this is the way different textures can be activated and individually rendered Within the ModelMeshPart class we finally find where the IndexBuffer and VertexBuffer have been hiding away Alongside them are several other properties that are essential for us to be able to render the mesh part: VertexOffset is required when the vertex buffer is set into XNA using the SetVertexBuffer function; and NumVertices, StartIndex, and PrimitiveCount are all required by the DrawIndexedPrimitives function There are two different methods that we can use to draw the model The first requires us to loop through each of the mesh parts, telling each one to draw itself using its own Effect object.

Up until MySQL 5.0.0, the following rule always applied to your queries: For each table referenced in your SELECT statement, only one index could be used to retrieve the selected table columns. With the release of version MySQL 5.0.0, a new type of access strategy is enabled, called an Index Merge. In some cases, this type can enable data retrieval using more than one index for a single referenced table in your queries. In an Index Merge access, multiple executions of ref, ref_or_null, or range accesses are used to retrieve key values matching various WHERE conditions, and the results of these various retrievals are combined together to form a single data set. You ll learn about the Index Merge ability in the next chapter, when we discuss dealing with OR conditions.

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These Effect objects are provided by the model so we do not have to create them, but of course they don t know anything about the environment that we have set up In order for the mesh part to render correctly to the screen, we need to give it the world, view, and projection matrices that it is to use The easiest way to obtain them is from our own class-level BasicEffect, as defined within our main game class A sample piece of code that performs this task is shown in Listing 8 2 In this code, the ObjectModel variable contains the Model being rendered, the effect variable is the class-level BasicEffect, preconfigured with all the matrices required for rendering, and the mesheffect object is used to iterate through each of the Effect objects provided by the model Listing 8 2.

A subquery is simply a child query that returns a set of values using an IN clause in the WHERE condition. When MySQL knows the subquery will return a list of unique values, because a unique, non-nullable index is used in the subquery s SELECT statement, then the unique_ subquery access type may appear in the EXPLAIN result. Listing 7-28 shows an example of this. Listing 7-28. Example of the unique_subquery Access Type mysql> EXPLAIN -> SELECT * FROM CustomerOrder co -> WHERE co.status IN ( -> SELECT order_status_id -> FROM OrderStatus os -> WHERE os.description LIKE 'C%' -> ) \G *************************** 1. row *************************** id: 1 select_type: PRIMARY table: co type: ALL possible_keys: NULL key: NULL key_len: NULL ref: NULL rows: 6