摘要: Remember that data objects are containers for data, and if you're going to the trouble to enumerate data objects, it's a safe bet that you're after the data in each one. Once you've got a valid IDirectXFileData object that points at an enumerated data object, you can retrieve the object's instance name, template GUID, and data using a trio of functions. The first function, IDirectXFileData::GetName, retrieves the name of the data object instance.
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摘要: At this point, you have opened your .X file and registered the templates you'll be using (such as the DirectX standard templates). The enumeration object has been created, and you are now ready to pull data from the .X file.
In its current state, the IDirectXFileEnumObject object you created points to the first data object in the file, which is typically the Header object. All top?level data objects are siblings of the Header object (or the first object in the file). Each data object yo
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摘要: Regardless of the version of DirectX you are using (either DirectX 8 or 9), the methods you use to access .X files are the same. In fact, the interfaces have not changed names between the two newest versions of DirectX (8 and 9), making it possible for you to quickly port your version 8 code to the newer version 9 (and vice versa if you want).
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摘要: some .X Standard Templates:
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摘要: Data referencing has one caveat?the template restrictions set in place must allow you to use a reference. That might not make sense at first, but you can't use a data reference without the proper restrictions. An .X file represents an entire hierarchy of data objects, which can only be siblings or children of other objects. Thus, data objects embedded in other objects need the proper restrictions to be referenced or instanced. For example, consider the following three template declarations:
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摘要: Since an .X file's open?ended design is so, well, open?ended, you must predefine each template that you intend to use for DirectX to understand how to access the template's data. Typically templates are defined inside an .X file, although you can define them from within your program (as I mentioned earlier).
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摘要: Your 3D meshes need a place to liverather, you need a place to store your 3D mesh data (not to mention all that other data your game project requires). What's a developer to do?develop his own file format or go with a third?party format? With so many popular formats out there, it's an easy choice to make, but what about the restrictions some formats impose? Why can't you just use somebody else's file format and configure it to work the way you want?
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摘要: In your game, the paths need not be so straight. You can have your objects move along a nice, curvy path, such as when a character walks around in a circle. Trying to define a smooth circular path using straight lines is nearly impossible, so you must develop a second type of path?one that can handle curves. Not just any type of curve, however. Remember that this is advanced animation?we're going for the big leagues here, and that major hitter you want is a cubic Bezier curve! As Figure 2.3 illu
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摘要: Time?based motion doesn't just apply to animation. Movement is also a major part of your game, and basing movement on time guarantees that all systems will run your game consistently, regardless of how fast or how slow they are.
The most common use for time?based movement is when you want to move an object a set distance over a period of time. For example, suppose a player moves his joystick to the right, so your game responds by moving the on?screen game character to the right a little
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摘要: In the olden days, games were made to animate graphics based on every frame processed. To ensure that the animations always ran at the same speed, those games sometimes limited the number of frames per second that could be processed. Of course, those old games were made for computers that couldn't easily process more than 20 to 30 frames per second, so it was safe to assume that limiting the number of frames per second would never surpass that 20 or 30 frames per second mark.
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