I'm still not getting this in my mind right.  Seems like a sort of
perspective camera to me, like say you were wanting a rectangular
region of 4x3 units at 0 z then double that at 1 z (8x6) and half that
(2x1.5) at -1 z.... am I even close?
Someone is bound to have a better grasp on your concept than I so
don't despair : ) just yet anyway.
To let you know what I'm thinking this would be like I'd have to say
it's a slice of 3D turned to one side a bit.  If so why not use
orthographic on a rotated section of a model?  I may be way off about
this, I know, so sorry if I'm confused.

PS  see p.b.i. for J. Grimberts demo gif.

Bob

J. Grimbert <jgr### [at] atos-groupcom> wrote in message
news:37D3A158.9E7A5019@atos-group.com...
> Previously in povray.advanced-users, but here due to the attachment.
>
> Bob Hughes wrote:
> >
> > This may be obvious to others as well, I can't make out your
intention
> > exactly.  I'd suggest posting a drawing if you could.  I'd suggest
> > HTML formatted posting but that's NOT a good idea since people
have a
> > difficult time with them.  Also I flunked out of being a
> > "advanced-user" so I probably shouldn't even be here.
> >  ; b
>
> My intention would be for example to model a diesel engine in pov,
> and then cutting it with a plane (or a box)... to obtain the
> perspective image one can see in a industrial drawing class room,
> where the x and y dimensions are kept, and the right angle too,
while
> dimension in the z are projected in a parallele perspective.
> (see the attached gif)
> The ray are parallels, like with the orthographic camera, but
> unlike the orthographic camera, the <1,1,1> point is not hidden by
> the <1,1,0> point  (rather the <2,2,0> or the <1.5,1.5,0> )...
>
> I may defined it like a sort of oblic orthographic...
>
> So my question remains:
>
> Have anybody any suggestion on how to achieve that ?
>  (with all pov-object, of course, not only the box).
>
> >
> > Bob
> >
> > J. Grimbert <jgr### [at] atos-groupcom> wrote in message
> > news:37D38620.7E9E491A@atos-group.com...
> > >
> > > I would like to use pov to render a view like the
> > > own drawn below for a box
> > >
> > >   +--+
> > >  /  /|
> > > +--+ |
> > > |  | +
> > > |  |/
> > > +--+
> > >
> > > It's just the classical 3D technical drawing...
> > > It looks like the orthographic camera, but
> > > increase of the z is transformed as p*(x+y),
> > > with p either 1/2, 1 or 3/4 ...
> > >
> > > Have anybody any suggestion on how to achieve that ?
> > >  (with all pov-object, of course, not only the box).


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