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In article <38dd34f8@news.povray.org>, "Steven Jones" <ste### [at] tsn cc>
wrote:
> What happens to an object if it's bounding box is smaller than the object
> itself?
Depends...assuming you have POV set to not override manual bounding,
only the parts of the object visible through the bounding shape will be
rendered. If the bounding object is smaller than the object being bound
object but is located between the object and the camera(or around the
camera), than the whole object can be visible from the camera's point of
view but not from light sources or other objects. Meaning, you can make
an object which doesn't have any reflections or shadows by moving the
bounding box around. While this can sometimes be useful, it is more
reliable to just use a patched version like MegaPOV which has no_image,
no_reflection, and light groups.
The basic rule POV uses is, if the bounding shape is visible, check to
see if the actual object is visible. This avoids always checking against
a hard to calculate object when it isn't necessary.
However, since the results are really pretty unpredictable when looking
at the scene file, you should always use a bounding shape that contains
your object. With some settings, POV will use it's automatically
calculated bounding and ignore the bounded_by statement.
--
Christopher James Huff - Personal e-mail: chr### [at] yahoocom
TAG(Technical Assistance Group) e-mail: chr### [at] tagpovrayorg
Web page: http://chrishuff.dhs.org/
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