- ペーパーバック: 456ページ
- 出版社: Oreilly & Associates Inc (2001/11/15)
- 言語: 英語
- ISBN-10: 0596000065
- ISBN-13: 978-0596000066
- 発売日： 2001/11/15
- 商品パッケージの寸法: 17.8 x 2 x 23.3 cm
- おすすめ度： この商品の最初のレビューを書き込んでください。
- Amazon 売れ筋ランキング: 洋書 - 497,111位 (洋書の売れ筋ランキングを見る)
Physics for Game Developers (英語) ペーパーバック – 2001/11/15
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本書を読むにあたって、物理の専門知識は必要ない。ただこの本は、基本的な大学レベルの古典物理学の知識を持っていることを前提に書かれている。また、三角法、ベクトル、および行列と（方程式と恒等関数は付録に参照が載っている）、陽関数の微分、積分を含む大学レベルの微積分学に関する理解も必要だろう。（Book Description, Amazon.com）
Colliding billiard balls. Missile trajectories. Cornering dynamics in speeding cars. By applying the laws of physics, you can realistically model nearly everything in games that bounces around, flies, rolls, slides, or isn't sitting still, to create compelling, believable content for computer games, simulations, and animation. Physics for Game Developers serves as the starting point for those who want to enrich games with physics-based realism. Part one is a mechanics primer that reviews basic concepts and addresses aspects of rigid body dynamics, including kinematics, force, and kinetics. Part two applies these concepts to specific real-world problems, such as projectiles, boats, airplanes, and cars. Part three introduces real-time simulations and shows how they apply to computer games. Many specific game elements stand to benefit from the use of real physics, including: *The trajectory of rockets and missiles, including the effects of fuel burn off *The collision of objects such as billiard balls *The stability of cars racing around tight curves *The dynamics of boats and other waterborne vehicles *The flight path of a baseball after being struck by a bat *The flight characteristics of airplanes You don't need to be a physics expert to learn from Physics for Game Developers, but the author does assume you know basic college-level classical physics. You should also be proficient in trigonometry, vector and matrix math (reference formulas and identities are included in the appendixes), and college-level calculus, including integration and differentiation of explicit functions. Although the thrust of the book involves physics principles and algorithms, it should be noted that the examples are written in standard C and use Windows API functions.商品の説明をすべて表示する
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The book does have several shortcomings which prevent it from being a great book, the most important of which is that the content is fairly limited. It's less than 300 pages, and a significant amount of space (especially in the later chapters) is taken by source code listings. Of course, this is somewhat offset by the book's relatively low price.
If you buy this expecting it to be the ultimate guide to physics in games, you'll be disappointed. However, if you buy it as an introduction to physics in games (which how it's intended to be used), I think you'll be happy with it.
As an example, the simple trajectory problem, launch a particle in constant acceleration with no friction, is presented here as four separate problems; launch a particle with target at same height, launch a particle with target higher, launch a particle with target lower and launch a particle horizontally with target lower. No physicist would approach the problem this way, it is absolutely trivial to present them all as the same problem with the same general solution.
Occasionally the book lapses with just outright errors. The most serious so far I've seen is the cylinder rolling down a plane without slipping is solved by assuming the frictional force is the static coefficient of friction times the normal force. In fact, the force can be any amount less then this. As a result the solution given has the funny property that it will roll up the plane for small angles.
The book isn't all bad, and may well serve it's primary purpose, which I assume, is to give a litany of examples that game developers may paste into their games. It certainly has lots of examples, and most are correct physics, still, perhaps with my bias as a physics professor, I was hoping for a bit more physical insight into the problems.
The overall mathematical level is 'easy'.
David does not dig deeper into mechanics than it is necessary for a game.
The book is usefull for a beginner but also deserves the 'knowing' as a good cookbook for the games-level.
One of the biggest problems with the text is that if your going to jump into a single chapter and code up a sample of just the object being talked about your going to be okay. However, if your going to be deriving your own code and objects based on the material in the book your going to find yourself having a hard time.
A great example lies in the first chapter which derives formulas for working with a car, with a fuel tank and driver. Now, first off, the author implements 0 source code for the functions shown in the book. This leaves you as the reader to develop your own functions and test things out, possibly by adding another driver, or implementing a generic method for defining composite bodies. If your technically proficient enough to do this, you'll use the numbers provided to test your code. What do you find? Well, that the numbers the author put in the book are wrong.
Since the book is based on precise math and physics, this type of slip-up, especially in a prime example (its the major example for the first chapter), is killer in terms of my trust in the books content.
Still, I do recommend buying the book, just prepare yourself for the technical inconsistencies.
What I am praising is his physics examples. I do not care about units or language choice which seems to be a complaint. From his book I can add reality in terms of physics which I could not find in any other book.
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