On Mon, 18 Jan 1999 22:03:47 +0100, Spider <spi### [at] bahnhofse> wrote:
>I thought I read somewhere in the doc's that it is calculated if inside a hollow
object,
>otherways not, (calculating in and outside)

That is true, too, but the effect I think Ken is seeing is not
simply due to the presence or absence of the 'hollow' keyword.
Try it: make a hollow plane and put media in it.  You won't be
able to see the media.  Add a completely transparent sphere
below the plane, and you'll see a roughly-circular spot of media.

----------------------------
plane {y, 0 hollow pigment {color rgbt 1} interior {media {emission red .1}}}
  
/* uncomment the next line to see the media */
//sphere {-y, .5 pigment {color rgbt 1}}
     
camera {location -8*z look_at 0}
----------------------------

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