right-handed Math Lib

XNA libraries are right-handed and DirectX API is left-handed.

Why XNA team decided to introduce this inconsistency?

How this will affect porting code from DirectX C++ to XNA?

[431 byte] By [ABS123] at [2008-2-20]

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# 1

The XNA team blog states:

The reason we’ve decided on going with this is to ease integration in

both content and middleware components. If everyone can agree on the

coordinate system, then it makes it much easier to use content or APIs

from outside of the XNA Framework. I say “by default” because there is

nothing that requires a right-handed system. So if you

absolutely need to be left-handed (or something else) you can do so,

you’ll just need to do some of the calculations yourself.

chadmv at 2007-8-31 >

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# 2

It don't affect any code porting. Just work on with left handed math and all stuff is like before XNA. Btw, I found right handed systems much nicer... I have always worked on a right handed system, even with D3D.

It seems more natural to have right-handed coordinate system (like in OpenGL and now in XNA) with texture coordinates from top to down (like in D3D and XNA)... one idiotic decision in OpenGL were always the inverted texture coordinates... besides many other idiotic decisions in OpenGL (texture objects, the texgen... etc. )

Just think about landscapes... right handed system with top down texture coordinates... yummy yummy yummy. A simple vertex shader for transformation and texture generation are just 5 dot products and nothing more. 4 dot products to transform the vertex and one for texgen. Fast as hell.

EvilOneSD at 2007-8-31 >

# 3

Guys,

The XNA pages/Docs should state that MS switched the coordinate system in 36 point red font. I don't need to find that out after 3 days of hammering my head against the keyboard looking for "where did I invert coordinates?" and "why doesn't my picking routine work?". I kept telling myself that D3D is left-handed so there's NO WAY XNA is right. Well.. I was wrong! :). Please make it clear in the docs!

Thanks.
IH

Newborn at 2007-8-31 >

# 4

Guys,

Thanks.
IH

Newborn at 2007-8-31 >

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