[Sidefx-houdini-list] aperture focal length relations

Jeff Higgins jeffrey.higgins at gmail.com
Wed Jun 20 10:19:42 EDT 2007


i remember someone telling me once why that was the default, but its lost ot
me know.
here's hoping one of the sesi crew will pop on and let us know!

jeff


On 6/20/07, Adrian Lee <dryrainstudios at gmail.com> wrote:
>
> Thanks Jeff. that does make alot more sense.
>
> Do you know if the default houdini settings are set for the human eye?
> Somebody said to me that an aperture of 41.4214 is the same as the human
> eye.
>
> Ed
>
> On 20/06/07, Jeff Higgins <jeffrey.higgins at gmail.com> wrote:
> >
> > i think the reason why the name is not intuitive (at least for me it
> was)
> > is
> > because its often referred to it as the "film aperture", which is
> > different
> > from the "aperture".
> >
> > hopefully that makes it less confusing,
> >
> > jeff
> >
> >
> >
> > On 6/20/07, Jeff Higgins <jeffrey.higgins at gmail.com> wrote:
> > >
> > > The aperture in a real world camera is just an opening to control the
> > > amount of light recieved through the lens.
> > >
> > > with houdini, i think the aperture is more related to the film gate or
> > ccd
> > > size, so with a larger/smaller aperture in houdini terms you would
> > appear to
> > > zoom in/out!
> > >
> > > also, its important to note that the units of your focal length must
> be
> > > expressed as the same units as your aperture, mixing them will give
> bad
> > > results. The benefit to this is that the focal length or aperture by
> > itself
> > > need not be expressed in a particular unit (ie. a houdini scene unit
> or
> > mm
> > > ).
> > >
> > > hope that helps!
> > >
> > > jeff
> > >
> > >
> > > On 6/20/07, Adrian Lee <dryrainstudios at gmail.com> wrote:
> > > >
> > > > Hello back again and still trying to match move Houdini's cameras.
> > > >
> > > > Does anyone know the relationship of aperture to the focal length in
> > > > houdini? It seems to effect the zoom in the same way the focal
> length
> > > > does.
> > > > this isnt true with  real world cameras. Is there a
> > > > different  definition of
> > > > aperture with relation to 3d?
> > > >
> > > > thanks in advance
> > > >
> > > > Ed
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> > > >
> > >
> > >
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