Zhao,
> I have read raytrace.h, nmg.h, given email list and some other info. Are we
> almostly sure that
> model and nmgregion are exactly useless and should be removed? And If I do
> so, how about the
> places (I don't know how much exactly) using them. All such places should be
> done the
> corresponding modification...or maybe I needn't concern about this thing
> now?
The NMG primitive is based on an implementation originally designed
for a stand-alone NMG CAD. That's why we have redundant structures
there. The model represents the whole geometry similar to the content
of a BRL-CAD *.g file and nmgregion is similar to the BRL-CAD region
struct. I.e. we can reproduce the behavior of model and nmgregion
with BRL-CAD capabilities.
Furthermore, theses structures are totally invisible for general
BRL-CAD routines. All shells of a model could be put into a single
shell and the ray-trace would still look the same. And even more,
there are routines which will get confused if they find more than one
shell in an NMG primitive.
You can look for the relevant places by removing the accompanying
functions and looking who complains during the compilation.
However, there could be an issue (probable solvable) with the g-asc
and asc-g programs (conversion between the binary ans ASCII version of
BRL-CAD database). These programs definitely look for the internal
structure of the NMG primitive.
Regards,
daniel
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