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# How much math do I need to use directx?

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### #1ISDCaptain01  Members   -  Reputation: 1475

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Posted 02 October 2012 - 07:15 PM

Ive been searching around various forums and the responses vary. SOme people have been as as far as saying multivariate calc, differential geometry, linear algebra, discrete math, and what not. I mean I could understand If you want to push 3d graphics to a new frontier, but to use directx/opengL? Someone give me an honest answer. My math knowledge is only up to calc 1 although a bit fuzzy due to lack of use. Its been my dream to make a crappy hobbyist quality 3d engine, but if i need to know a truckload of math that would be a hearbreaker =(

### #2Bacterius  Crossbones+   -  Reputation: 12907

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Posted 02 October 2012 - 07:28 PM

You need at least a good grasp of linear algebra, but don't worry, you can get up to speed easily since linear algebra is mostly self-contained, so if you take a class or follow a book on it you should be good. Discrete math could be useful (graph theory might help you in some specific situations) but in general you should be good with only calc/trig/linear algebra if you don't want to push the cutting-edge. All the multivariate calc, etc... is extremely specific and if you're doing fairly conventional graphics programming, you will rarely if ever use them.

Of course, you can always do everything with zero math knowledge, following tutorials telling you to use such and such math function, but in my opinion that's not fun and it's more satisfying to know what you are doing. Plus you'll be able to solve problems instead of getting helplessly stuck.

“If I understand the standard right it is legal and safe to do this but the resulting value could be anything.”

### #3caldiar  Members   -  Reputation: 715

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Posted 02 October 2012 - 07:30 PM

Honestly, the most important math you could know for a solid foundation to build off of would be trigonometry and linear algebra. Ultimately you're working with planes (triangles) aligned within a 3D space (2D if you're making a 2D game). Knowing your trig will be of huge benefit when it comes to triangle manipulation.

### #4oldgregg  Members   -  Reputation: 231

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Posted 03 October 2012 - 07:04 AM

For super basic DX and starting to learn you really only need matrices and vectors. That's what they taught us at uni and then when you start getting more advanced you're looking at trig, pythag and others similar to that.

### #5GeneralQuery  Crossbones+   -  Reputation: 1263

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Posted 03 October 2012 - 07:38 AM

To use directx, you don't need to know any math. To do anything useful with directx, you will need to know math (as covered already by other posters in this thread). I started off in 3d graphics without knowing any math. You can only get so far, and even then it's a frustrating and precarious road as it's like trying to understand complex concepts in a foreign language you have little grasp on: it's just another layer of complexity that makes a hard task even harder. Luckily, as Bacterius highlighted, the bare minimum is pretty self contained, i.e. you can pick up a math book with a gaming slant and start making headway. From my personal experience, I cannot emphasise this enough: if you're interested in graphics, learn the math! If you don't want to learn the math because you find it boring and lack the motivation then you can pretty much drop your ideas of working with low level APIs like GL and DX or any low-level graphical work. If your primary motivation is making games then off the shelf engines would be a far better option, although the bare minimum (cartesian coordinate system, vectors and, to a slightly lesser degree, matrices) is still important (and, in all fairness, pretty easy to grasp, even with a phobia of math).

### #6freakchild  Members   -  Reputation: 565

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Posted 03 October 2012 - 08:49 AM

Its been my dream to make a crappy hobbyist quality 3d engine, but if i need to know a truckload of math that would be a hearbreaker =(

Bear in mind that a lot of the knowledge you need to do this to the level you mention is actually what you can pick up from DirectX tutorials and books, which you'll have to do anyway if you're new to DirectX.

A couple of people have commented on that sort of thing as a possibility and/or whether or not it's a good idea, but I would classify it as giving it as go or 'making headway' as GeneralQuery mentioned. I think the advantage of doing that is that you'll learn more about your own limitations during the process, including understanding whether you need to pick up a little more math knowledge.

If you already know calc 1 then do consider that through practice and application, the fuzzyness you describe will disappear and you are somewhat already set up to be filling in blanks from other math topics.

Also bear in mind that there are many 'graphics programmers' out there who don't necessarily operate at the cutting edge of R&D and are quite often following others. Really, the idea these same people are top math students or not is more a measurement of how much more easily they'll be able to devour white papers to follow new research but even the lack of an ability to do that does not preclude a lot of people from developing 3D engines. For many, it just means they're devouring knowledge at a different (higher) level, perhaps after others have turned said white papers into tutorials and pseudo code, in other cases it's often using libraries developed by others and gradually picking up the knowledge that is initially quite alien.

### #7clb  Members   -  Reputation: 2143

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Posted 03 October 2012 - 09:21 AM

You don't necessarily need to know the implementation details or derivation of half of the formulas, but you will need to understand conceptually how to use the math libraries, and how to use them to compute the proper transforms.

If you do only 2D, the math involved is simpler, but not necessarily by much. It depends a lot on what you are doing.

Here are some links to test yourself:
- Do you think you can understand a math library like this and how to utilize it e.g. to specify object positions, move them around, rotate and scale them?
- Are you familiar with the Direct3D pipeline stages? A lot of the math you feed into the device revolves around that architecture.
- Does the chain of linear spaces "local -> world -> view -> clip -> screen" sound familiar, and can you understand the concepts related to this?

If you feel comfortable with these, you'll be pretty well set math-wise on developing your own 3D engine. Math-wise there's not much else than basic calculus and linear algebra involved.
Me+PC=clb.demon.fi | C++ Math and Geometry library: MathGeoLib, test it live! | C++ Game Networking: kNet | 2D Bin Packing: RectangleBinPack | Use gcc/clang/emcc from VS: vs-tool | Resume+Portfolio | gfxapi, test it live!

### #8Pointer2APointer  Members   -  Reputation: 283

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Posted 03 October 2012 - 11:39 AM

How much math do I need to use quantum entanglement theories?

Basically, how much math you need depends on what exactly you do, and how you implement it.

If you want the truth to be told, to go bare-bones and even make a crappy 3-D game yourself, you will have to understand some forms of math.

These can include, but are not limited to:

1.Geometric math.

2.Physics.

3.Vector graphics(pretty much Geometry again).

4.Linear Algebra(stress to say it, but yes, it helps a lot).

Honestly, you don't have to be a math genius, but application of it will be unavoidable at some point(usually the beginning).

The good thing is Geometry, shapes, etc. All that stuff is what little kids/toddlers learn. Math is used everyday for some reason, even if it's just basic arithmetic. Math is shoved in all of our brains, so it's not some "foreign" language you need to newly understand.

Sure, it gets complicated, but most of the time you're limited to mathematics that ONLY apply to game-specific logic and rendering, etc.

One pretty easy way (well, easier, let's say) to use more advanced math in 3D games is in camera rendering through projection matrices, view pointers, eye points from field-of-view projections, and vertex model space positioned by "world space" or matrices(you can think of the 3D land as world space, and many programmers differentiate "object space" from the world, specifically for models and the like).

Edited by Pointer2APointer, 03 October 2012 - 11:40 AM.

Yes, this is red text.

### #9ISDCaptain01  Members   -  Reputation: 1475

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Posted 03 October 2012 - 02:59 PM

I have been reviewing my algebra and trig

So far I know SohCahToa, unit circle, degrees to radian(and vice versa), functions, slope stuff, exponents, factoring,
basic matrices addition, subtraction, multiplication, cartesian coordinate system, trig identities etc etc.
So i went back and looked at my calc test, and it made me barf. I was like WTF was i doing here?
My main question is should I bother reviewing calc or just move onto linear algebra?

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