Re: Spherical projection on I.Reality

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Javier Castellar (javier++at++sixty)
Wed, 3 Apr 1996 20:05:43 -0800

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

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