Re: eye viewpoint vector

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Angus Dorbie (dorbie++at++multipass.engr.sgi.com)
Mon, 5 Jan 1998 17:14:35 -0800

On Jan 5, 3:17pm, Volz, Bill (wrvo) wrote:
> Subject: eye viewpoint vector
> Anyone know how to obtain the vector that points along the eye direction
> (perpendicular to the screen)? I know it in there somewhere, but where.
> Could I take two points in the view system ( say (xcenter,ycenter,1) and
> (xcenter,ycenter,2), where [xy]center is the center of the viewport) and
> inverse transform and then subtract them to get the vector? Is there an
> easier way?

In Performer transform 0, 1, 0 through the pfChannel matrix.

Use the vector transform not the point transform.

Cheers,Angus.

-- 
"They can't break you if you don't have a spine."
                                      - Wally.


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