Warp wrote:
> 
> jmvdvalk <jm.### [at] hccnetnl> wrote:
> >>>   Wasn't automatic bounding introduced in 3.0?
> >>
> >>Yes.
> 
> > No, in 2.0. (You challenged me into checking the docs ;-)
> 
>   I quite clearly remember that in 2.2 you had to bound objects by hand
> if you wanted speed, but in 3.0 POV-Ray started to remove those user-specified
> bounding objects (because it thought it could do better than me).

From the POV-Ray v2.2 docs --

3.3.12 BOUNDING SLABS CONTROL
      -MB         Turn off bounding slabs
      +MBnnn      Use bounding slabs if more than nnn objects in scene.
New in POV-Ray 2.0 is a spatial sub-division system called bounding slabs.
It compartmentalizes all of the objects in a scene into rectangular slabs
and computes which slabs a particular ray hits before testing the objects
within the slab.  This can greatly improve rendering speed.  However for
scenes with only a few objects the overhead of using slabs is not worth the
effort.  The +MB switch sets the minimum number of objects before slabs are
used.  The default is +MB25.  The -MB switch turns off slabs completely.

I too thought they were introduced in 3.0 but it appears we both were wrong. 

-- 
Ken Tyler

Post a reply to this message