Paul Bourke nous illumina en ce 2008-06-29 08:55 -->
> Greetings all ... I was wondering to what extent PovRay could assist with the
> simulation of projection designs for immersive environments I work on. By this
> I generally mean domes with one or more projectors, the delivery of digital
> content requires image warping .... all of which I am familiar with in a
> mathematical sense but I need a "nice" way of presenting the concepts to
> "clients". As an example, imagine a dome with 5 projectors creating an
> overlapping video image around the rim. See
>      http://local.wasp.uwa.edu.au/~pbourke/tmp/sim/
> I can convey how the images appear (see the model.zip file), but it breaks down
> if I want to look at things from the outside of the dome. It also fails if I
> introduce a mirror in front of the projectors (a fairly common thing in the
> projection community). ps: in case it isn't obvious, the frustums around the
> light source in the model act as the data projector beams, the light source is
> at the apex of the frustum.
> 
> So my question is: Is there a way to use photons (albeit probably expensive) to
> form the projection of images onto the dome?
> 
> If you think it is but it will take you time to demonstrate it then please feel
> free to quote for the work required. Probably better to do so offline, email:
> pau### [at] gmailcom
> 
> 
If you only want the projection, then a "slide" with a filtering image_pattern 
will do the trick. You can use a single faced object such as a polygon for that.
If you want to have reflections of the light beam, then you'll need to use 
photons. To help reduce the photons phase, you can set "photons pass_through" on 
the slides themselve and set the mirror(s) as photons target.

-- 
Alain
-------------------------------------------------
You know you've been raytracing too long when you look at a matrix transform and 
know instantly what it does.
John VanSickle

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