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23 Nov 2024 23:44:15 EST (-0500)
  A projection "screen" (Message 1 to 3 of 3)  
From: Garrett Baird
Subject: A projection "screen"
Date: 1 Apr 2011 03:05:01
Message: <web.4d9578183b3ffb1c69a1e3600@news.povray.org>
I suspect that this is a pretty basic question, but I've not found the right
search terms yet.  I'd like to know how to do the following:  imagine you're in
a stadium, and there's one of those jumbo-tron screens that shows people in the
audience.  If I were to take a picture of that stadium, then that picture would
contain the people in the stadium, plus that jumbo-tron screen, which shows the
perspective of another camera, projected onto a rectangle.  I'd like to know how
to replicate this behavior (having a rectangle somewhere in my scene whose
texture is the projection of some other part of the scene).  Is there an easy
way to do this?


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From: Stephen
Subject: Re: A projection "screen"
Date: 1 Apr 2011 03:34:50
Message: <4d95801a$1@news.povray.org>
On 01/04/2011 8:00 AM, Garrett Baird wrote:
> I suspect that this is a pretty basic question, but I've not found the right
> search terms yet.
...
>  Is there an easy
> way to do this?
>
>
Yes, there is an example scene called Desk.pov which does this.
The basic idea is that it is a two step process. The fist step renders 
the initial scene and the second step renders the scene again with the 
inclusion of the first image as an image map. You can increase the 
recursion level by adding more steps.

-- 
Regards
     Stephen


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From: Trevor G Quayle
Subject: Re: A projection "screen"
Date: 1 Apr 2011 07:40:01
Message: <web.4d95b8afb6a6ddbdb05ef170@news.povray.org>
"Garrett Baird" <the### [at] hotmailcom> wrote:
> I suspect that this is a pretty basic question, but I've not found the right
> search terms yet.  I'd like to know how to do the following:  imagine you're in
> a stadium, and there's one of those jumbo-tron screens that shows people in the
> audience.  If I were to take a picture of that stadium, then that picture would
> contain the people in the stadium, plus that jumbo-tron screen, which shows the
> perspective of another camera, projected onto a rectangle.  I'd like to know how
> to replicate this behavior (having a rectangle somewhere in my scene whose
> texture is the projection of some other part of the scene).  Is there an easy
> way to do this?

In the megaPOV version there is a camera pigment that does exactly this, but it
looks like it didnt get into the official POV

-tgq


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