Re: [Plib-users] Invert?

[Brad C. <bco...@ac...>]

Steve,

In version 1.0.20 doing a search on all files I was unable to find
a reference to sgInvertMat4.  Do I have a wrong version?

Is it safe to use this function to get the inverse of the projection matrix?

Thanks,

Brad

----- Original Message -----
From: "Steve Baker" <sjb...@ai...>
To: <pli...@li...>
Sent: Wednesday, May 24, 2000 5:12 AM
Subject: Re: [Plib-users] Invert?


> Brad Colbert wrote:
>
> > What happened to the matrix inversion routines that are in the sg
documentation?
>
> *Nothing* happened!  They are alive and well...I use them all the time.
>
> For general matrices:
>
>   void sgInvertMat4 ( sgMat4 dst, const sgMat4 src ) ;
>   void sgInvertMat4 ( sgMat4 dst ) ;
>
> But *much* faster - if you know that the matrix is a simple
> rotate+translate then:
>
>   void sgTransposeNegateMat4 ( sgMat4 dst, const sgMat4 src ) ;
>   void sgTransposeNegateMat4 ( sgMat4 dst ) ;
>
> ...and of course there are double-precision versions.
>
> Hmmm - the documentation seems to be correct...they work OK...
>
> What's your problem?!?
>
> --
> Steve Baker                  http://web2.airmail.net/sjbaker1
> sjb...@ai... (home)  http://www.woodsoup.org/~sbaker
> sj...@ht...      (work)
>
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