Re: Spherical projection on I.Reality

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Angus Dorbie (dorbie++at++bitch.reading.sgi.com)
Thu, 4 Apr 1996 12:03:11 +0100

For blending for ROI you could use the underlying vertex colour and use a
texture modulation texture function & make your ROI mesh vertices black. This
would mean you'd save the a screen clear and you wouldn't have to blend.

You could also use the remaining vertec colours as a local brightness control
on the dome.

Rgds,
Angus.

On Apr 3, 8:05pm, Javier Castellar wrote:
> Subject: Re: Spherical projection on I.Reality
>
> In general we would like to relay for both disotortion correction and
blending
> on the display system (i.e. we have here two SEOS Prodas with 3 channels and
> 155 degrees which perform the blending and the distortion correction).
>
> In case that the display system can not deal with distortion correction or
> blending (like some LCD light valve projectors) then you have to go in a
trade
> off of distortion correction vs. resolution/n_RMs.
>
> In cases of blending for LCD projectors the developer/integrator could use a
> 2D polymesh frame with source alpha and HIGH quality alpha to make a digital
> blending. There is a small overhead of fill rate depending on the area being
> fade but ... this is again a developer choice.
>
> We are not planning any specific support for this blending since we prefer to
> relay on integrators. SGI is not an integrator and we will not compete with
our
> own clients (integrators). Anyway the implementation of this aproach is easy
> using libpr or ogl in the draw callback.
>
>
> On Apr 3, 10:30pm, Dennis Pierce wrote:
> > Subject: Re: Spherical projection on I.Reality
> >
> > how are you going to handle the meshing of adjacent images? most high-
> > end projectors allow feathering, but this is only at the edge of the
> > "normal" horizontal edges - are you going to require planetary projectors,
> > or have you folks thought through other clever schemes?
> >
> >
> > --
> > --
> > Dennis Pierce
> > SGI / Ste 130 / 900 Winderley PL / Maitland FL 32751
> >
> > work : 407.660.0073
> > late : 407.660.2789
> > cell : 407.256.8447
> > vmail: 800.326.1020 x58548
> >-- End of excerpt from Dennis Pierce
>
>
>
> --
> *************************************************************************
> * Javier Castellar Arribas * Email: javier++at++asd.sgi.com *
> * * Vmail: 3-1589 *
> * Member of Technical Staff * Phone: (415)-933-1589 | 933-2108 (lab) *
> * Applied Engineering * Fax: (415)-964-8671
*
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>
>
>-- End of excerpt from Javier Castellar

-- 
Angus Dorbie,
The Reality Centre,
Silicon Graphics Ltd, UK
dorbie++at++reading.sgi.com

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