Path: utzoo!utgpu!jarvis.csri.toronto.edu!rutgers!apple!well!ewhac
From: ewhac@well.UUCP (Leo 'Bols Ewhac' Schwab)
Newsgroups: comp.sys.amiga
Subject: Re: X-Specs and Interlace
Keywords: X-Specs
Message-ID: <11931@well.UUCP>
Date: 1 Jun 89 05:54:45 GMT
References: <563@orange6.qtp.ufl.edu>
Reply-To: ewhac@well.UUCP (Leo 'Bols Ewhac' Schwab)
Distribution: na
Organization: Samuel L. Bronkowitz Productions
Lines: 30
Quote: "Ho!  Ha!  Guard!  Turn!  Parry!  Dodge!  Spin!  Ha!  Thrust!  <WHAP!>"

In article <563@orange6.qtp.ufl.edu> sutherla@orange6 (scott sutherland) writes:
>	I have a question concerning the "compatability" of the double-
>buffering used in the X-specs 3D glasses (and others, like the SEGA 3D
>glasses) and an interlaced screen.  [ ... ] ...I render most of my 
>animations in interlace so that I can record them to VHS tape at a later
>date [ ... ]
>
	I assume when you say this you mean you render it in 400 lines.

>An interlaced screen takes 1/30th of a second to be totally displayed. So
>the "standard" 30 Hz rate won't work. So what happens? Does the hardware/
>software combination compensate and slow down to 15Hz?  [ ... ]

	You will not be able to see all 400 lines of either the left or
right eye image when viewing the images in stereo.  If the software is at
all smart, you'll see every other line, so the picture will still be
intelligible (not vertically stretched).  Unless you plan to view these
images flat, there's no need to render them with 400 lines.

	If you wish to turn on video interlace (for VCR recording, for
example), you can use a PD program called 'SetLace'.  This will cause all
new screens and the WorkBench screen to start jittering away.

	Gawd, I really should write a short book on this subject...

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Leo L. Schwab -- The Guy in The Cape	INET: well!ewhac@ucbvax.Berkeley.EDU
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