Re: [Gnu3dkit-dev] G3DRenderer.h

[Philippe C . D . Robert]

On Monday, March 17, 2003, at 01:32  Uhr, Brent Gulanowski wrote:
<snip>
> > The render actions calls drawGeometry: on the geometry. The geometry 
> > then uses the passed renderer to draw itself. As far as I can see it 
> > this is done using [someRenderer drawPolygons:myPolys 
> > params:myParams] for example (if the node has not yet been compiled). 
> > Now if you first compile the nodes the renderer can create an 
> > optimised rep for internal usage. How this will look is still far 
> > away, I am afraid. But I originally had the idea that objectInstance: 
> > would be used whenever a geometry node has been compiled beforehand. 
> > Maybe this mechanism can also be used whenever a geometry node is 
> > shared by multiple shapes, though.
> >
> > Does that make sense to you?
>
> Your words are quite sensible. This compilation process is of very 
> high importance and interest to me. I suppose my concern is how 
> effective and efficient compiling itself can be. I certainly think it 
> is essential. The problems of course are that a compiled group of 
> nodes (what I like to call a flattened sub-tree) can no longer be 
> edited. Of course, what I have only just learned is that the compiled 
> node is retained by the renderer, meaning that the original, 
> uncompiled geometry is still held in the scene graph. I approve of 
> that, memory waste notwithstanding, because in a modeller, the user 
> can still go back and edit, and the enclosing sub-tree can be 
> re-compiled. For me, the issue then is, how do I not waste the work 
> done by compilation? Can the system leverage that in some other way? 
> What form ought one to compile a sub-tree into? (What forms are 
> there?) BTW, I'm asking these q's out loud, not asking you to answer 
> them. :)

What do you mean by "not wasting work done by compilation"?

> I like drawObject: -- it is more in line with the other draw... 
> selectors.

It's changed, but not yet checked into the CVS, thanks.

-Phil
--
Philippe C.D. Robert
http://www.nice.ch/~phip