Jim Charter <jrc### [at] msncom> wrote:
> Can anyone show me proper usage of the Shear_Trans macro.
>
> This is a modification I made to the "Basic Scene" supplied on the
> insert menu.  Can't get it to parse.
>
> #local A=<1,2,3>;
> #local B=<1,2,3>;
> #local C=<1,2,3>;
....
>    Shear_Trans(A,B,C)
....

Hi Jim,

You have to make sure that no two of those three vectors are parallel.

I.e.: These three conditions have to be met:

vlength(vcross(A, B)) > 0
vlength(vcross(B, C)) > 0
vlength(vcross(C, A)) > 0

(Note that there are also other ways to check for parallel vectors.)

--
Tor Olav
http://subcube.com

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