Daniel,
Fundamentally, the difference between a 'group' and a 'region' is:
A 'region' defines a single physical object (aka 1 piece of homogeneous
material).
A 'group' is a grouping of other 'groups' and/or 'regions'.
Code wise, the only real difference is a single region flag.
In order for a region to be interrogated and treated correctly, it would
need to have a LOS and GIFTmater/Aircode values, otherwise ithe region would
not have any density data to it and therefore brlcad would be unable to
calculate things like weight and mass.
-Dave L
On Thu, Mar 12, 2009 at 5:43 AM, Daniel Roßberg <
[email protected]> wrote:
> What’s the difference between a group and a region? Both are stored
> in a combination. I suspect that the attributes
> - is_fastgen
> - region_id
> - aircode
> - GIFTmater
> - los
> are applicable to regions only. I.e. the attributes
> - rgb_valid
> - rgb
> - shader
> - inherit
> - material
> - temperature
> can be used in both regions and groups.
>
> Furthermore the tree of a group has OP_UNION and OB_DB_LEAF nodes only.
>
> Is this right?
>
>
> Sziasztok,
> Daniel
>
>
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