Why should you implement math function?

[_Anonymous]

I have an question: Why there are custom math functions and classes in all graphics engines? D3DX provides us fully functional operation for vectors, matrices...even loading textures. Is there any other reason than cross-platform support?

[xavier]

Because no one has ever really made a game-ready vector math library. Yes, they all do the same thing, there is no reason that there is not a "standard" library that everyone can use rather than re-invent the wheel all the time.

You'll also find a lot of projects and studios have some level of "not-invented-here" disease. Ogre's math classes, however, have their origins in the WildMagic graphics engine math classes, so while Ogre technically has its own math classes, they actually originated for the most part with an existing set of classes.

[_Anonymous]

I mean, all the things is there, for free. Why do people still want to write their own?

[xavier]

I mean, all the things is there, for free. Why do people still want to write their own?

Again, I am shrugging.

[_Anonymous]

Ok. I see. Any other idea?
BTW, I'm considering between Boost and D3DX math libs. Which one should I use?

[jacmoe]

D3DX math - LOL

I didn't know that Boost has 3D graphics math functions?

[jacmoe]

http://www.ogre3d.org/forums/viewtopic.php?f=5&t=46143

[_Anonymous]

I forgot to say that i'm not using Ogre
And about Boost, yes, it has all the things like vectors, matrices, quarternions...plus lots of others functionalities. I saw an engine ultilized it here http://hieroglyph3.codeplex.com/. And it's a DirectX 11 engine

[jacmoe]

Then it would be a good idea to post your questions elsewhere, like GameDev.net ?
GameDev.net is excellent, IMO. They've got the best forum you can find.