Re: [boost] Geometry/Vector Lib

From: Martin Slater (mslater_at_[hidden])
Date: 2006-09-21 09:11:23

> created. The other advantage is that the resulting assembly code is just as
> fast as if the functions had all been explicitly written.
>   

even if that assembly is optimised sse?
>    vector2d v1(1.0f, 2.0f);
>    vector3d v2(-1.0f, 3.0f, 2.0f);
>    vector4d res;
>
>    vector_add(v1, v2, res);
>    /* res now contains (0.0f, 5.0f, 2.0f, 1.0f) */
>   

I've been bitten too many times using a library that does just this, if 
I want to change a n dimensional vector to any other dimension the added 
values should be explicitly provided.   Optimised versions that 
implicitly assume a value should be named accordingly so their use is 
obvious. Also using a c style interface to make the actual maths even 
more impenetrable seems like a bad idea.

There was a very long discussion about a vector library aimed towards 
game development on the sweng mailing list recently 
(http://lists.midnightryder.com/pipermail/sweng-gamedev-midnightryder.com/) 
which you may find useful.

cheers

Martin