Re: find out wcs

From: Tanner Lovelace (lovelace++at++cthulhu.engr.sgi.com)
Date: 08/09/2000 12:19:49

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Qinxin Yu wrote:
>
> Hi,
>
> Does anyone know if it's possible to find out the world coordinates for
> the point where mouse is pointing to when disply a model in Performer? If
> so, how does one do it? Thanks in advance.
>
> Quincy

Quincy,

What you need to do, since the mouse coordinates are 2D and
world coordinates are 3D is to construct a pfSeg from the eyepoint,
through the mouse coordinates and into the display area. Use
the channels frustum to construct this segment. Wherever
that pfSeg intersects with the model, that will be the coordinates
you want.

Tanner Lovelace

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