Re: [Opensg-users] Choosing between Performer, Open SceneGraph, and OpenSG

Thu, 28 Feb 2008 05:09:10 -0800 

On Feb 26, 2008, at 8:15 AM, Dirk Reiners wrote:



        Hi Shaping,

Shaping wrote:


In any descent Smalltalk, you can link a C library (CDECL or STDCALL

calling convention), and call the C routines like they were methods  
on a

class, where the class is an ExternalInterface (VW's term; it goes by
other similar names in other Smalltalks) representing the C library.
You'd build Smalltalk equivalents of the C++ classes, reify as much

state as you need on the Smalltalk site, and pass these parameters  
into
the C calls.  The guts of the C++ methods, of course, would have to  
be

in the C library.  It's a lot of work.


That sounds painful, indeed. :)


I wanted to do this several
years ago with Performer, but SGI don't give you the source with your

license.  I even talked to their lawyer about it, and he said that  
SGI

was not interested in a Smalltalk port.  Now they're just barely
interested at all in anything Performer.



Yeah, they're not doing software any more. Not enough business for  
them, I guess.



OpenSG

has a reflective interface for data, which can make these things
'relatively' easy.


I would like to know more about how this works.



In a nutshell we have a FieldContainer base class that almost  
everything in the
system is derived from. It has an interface that can tell you which  
fields an FC
has, and it has access methods for those fields. It's not fully  
reflective in
that it only talks about data, not methods, but it can help make  
certain things
a lot more extensible. The code to this is 99% auto-generated, so if  
you need
other interfaces you could probably add things to tit (that's going  
to get a
little messy, though, so if you can stick to the existing  
interface). Take a
look at FieldContainer and FieldContainerType. I'm not sure what the  
best

example code for that would be. Allen? Gerrit?


Yes.  Please make him aware of my efforts, if he is not already.


he's on this list, so I'm assuming he knows already. ;)



Allen is on vacation for the next several days, but I can probably  
answer any PyOpenSG questions that arise.


[snip]

 -Patrick


--
Patrick L. Hartling
Senior Software Engineer, Priority 5
http://www.priority5.com/




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