Check the VFAQ
http://www.students.tut.fi/~warp/povVFAQ.html#hollowobjects

Steve


Ruben Soto wrote:
> 
> rus### [at] jetes wrote:
> >

> > program 10 days ago), and I have a relative lack of knowledge even of
> > the basic foundations of raytracing and optics in general.
> >
> >   I have a question that arised from reading the 3.1a Main
> > Documentation. It is about putting a camera inside a solid (non-hollow)
> > object, and not being able to render media effects. Does this mean that
> > if I put a camera inside a solid, transparent object (Like a crystal
> > block), and I have some media defined outside of this object my camera
> > will not see it? The documents talk about this in EMPTY AND SOLID
> > OBJECTS, and it alludes to a "pitfall in the empty/solid object
> > implementation", but I am confused with the explanations that are
> > offered. For example, it is said that "In order to be able to put solid
> > objects inside a media or fog, a test has to be made for every ray that
> > passes through the media. If this ray travels through a solid object the

> > calculated in the part that the ray travels inside the object, but in
> > that point the ray can have information already about media outside the
> > object, am I wrong?
> >
> >   Also, I did a test scene in which I placed a crystal block with ground

> > this the opposite to what is said in the Main Documentation in the
> > section FOG AND HOLLOW OBJECTS?
> >
> >   Please, help me in this. It is really frustrating not to be able to
> > find an answer to this (apparently) easy questions.
> >
> >   Thanks!

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