Nieminen Mika wrote:

>   I have frequently seen people confused with the plane object. They
> obviously think about it as a 2D sheet, with no inside part, with both
> sides as outside.

Agreed on this one. And what makes it even more confusing isif you apply a solid
texture to the plane and your camera is on
the inside you can still see your scene clearly. Not true though
if you put your camera inside a solid textured box. This makes
it hard to grasp the relationships.

>   I'm not saying I understand everyting, of course :)

Yowser. And I thought I was alone in the dark.

>   I'm still a little confused with the 'clipped_by' statement. I don't
> know, if you clip off a part of an object, where is the inside and
> where the outside of the object, specially at the hole. This will affect
> only the media inside the object, of course. I have never tested it. Anyone
> know something about this?

That is an interesting point. I have a similar confusion about what
happens when you declare a 2D box like :

box{<-1,-1,0>,<1,1,0>}

This will render a single face of a 1x1x0(?) box. Where is the inside
and outside of such an object ? If a take six such 2D faces and
construct a cube from them using a union would I have to apply
the hollow state to get media to work inside ?

The same with disks. Is there a surface normal for the disk object
and how does it effect media ?

Stay tune for the answers to these questions and more in next weeks
dramatic episode of "All my Renders" ! Immediatly following our
show "One Life to Raytrace".

An now a word from our sponsers...

Ken Tyler

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