Dear Shaping,
Shaping wrote:
> Greetings.
>
> I am trying to pick a framework that I can settle down with for a while. My
> current choices are Performer 3.2.2 ($675 for a single license), Open
> SceneGraph, and OpenSG. I'm investigating the latter two now. There does
> not seem to be much activity surrounding Performer, though OpenSG is largely
> based on it.
Actually OpenSG has less in common with Performer than OSG, but in the end
they're all scenegraphs.
> My application is a math-model that iteratively drives construction of a
> large corresponding 3D graphical model. I want to be able to fly through
> and around the model, with various modes of coloring and opacity to aid
> visual extraction of features. I"m currently using Jun OpenGL in
> Visualworks, a flexible and easy to use tool, but lacking in performance.
>
> At this point I am most concerned about show-stopping bugs present in the
> three frameworks. I want to know mostly what is wrong or problematic with
> each framework, and when (or whether) the problems are going to be fixed.
I took a quick look at Jun (I'm hoping
http://www.sra.co.jp/people/aoki/Jun/Main_e.htm is reasonably up-to-date). The
one thing that none of the standard scenegraphs support out of the box is
boolean/topological operations, but the geenral geometry and rendering should
be
fine. All reasonable scenegraphs support models, coloring and opacity, so that
shouldn't make difference for the decision.
The interesting aspect is whether you want to use multi-threading to
parallelize
creation and display of your model. In that case OpenSG has an advantage, as it
is designed to do that. OSG won't let you change the graph while it's being
drawn.
You can get a general overview of OpenSG at
http://opensg.vrsource.org/trac/wiki/Features, and a (partial) comparison of
OpenSG and OSG at http://opensg.vrsource.org/trac/wiki/Comparison.
Hope it helps
Dirk
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