Re: Determining global coordinates from DCS

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Angus Dorbie (dorbie++at++sgi.com)
Tue, 02 Jun 1998 17:01:31 -0700

Corde Lane wrote:
>
> Quick question,
>
> I have created a robotic arm and would like to view from the end of that
> arm. However the DCS matrices are in local coordinates. Is there a way
> to determine a DCS in world coordinates? Or can I attach a channel view
> to a DCS node ?
>

Multiply all pfDCS matrices in the scene path to the arm together to
produce a world matrix which is then specified as the channel viewing
matrix.

For the gl it's actually the inverse viewing which is then computed by
performer for use by the gl. One way of visualizing this is by imagining
that by the time you model transform to the end of the arm (using pfDCS
nodes)
you have an identity matrix, ie no model viewing matrix, ie that's where
the eye is.

Cheers,Angus.

-- 
"Only the mediocre are always at their best." -- Jean Giraudoux 


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