Hi Daniel,
On Tue, 2004-02-24 at 14:38, Daniel B. Faken wrote:
> Hello OSG folks,
>
> I'm interested in using OpenSG for my VR stuff, but am confused about
> its status. Specifically, is anyone working on performance (as per the
> web-page "roadmap")?
a major part of that is done. There is still some stuff missing, but
it's already a lot better than it used to be.
> Has anyone implemented octree- or BSP-culling (or
> like methods)?
Yes and no. These things in general work best in more constraint
environments than scenegraphs, i.e. when you can throw away the
structure of the graph and restructure it into an Octree or BSP tree,
which is not easy to do for general systems. That said, we have tools to
merge a subtree into as few nodes as possible, and a complementary one,
that splits nodes in an Octree-fashion, to optimize culling. Both of
these actively change the scenegraph, though, so they might not be
applicable for all problems.
I've been thinking of local octrees or BSP trees in Group nodes to
handle very wide and flat trees efficiently, but there hasn't been a lot
of pressure for that. Do you know what your scenario is going to be
like, or whether that is important for you?
> Is the "New Action" setup complete? ..
No. The general coding is complete, and we have an IntersectAction based
on the framework as a proof of concept (that is significantly faster
than the old one :), but the general move has not happened yet. It will
probably take a little while before that happens.
But these things will not be visible to an outside user anyway, so it
shouldn't be a problem for you. Just at some point stuff might go
faster... :) We do have some changes in the works that will be visible
to some outside users (multi-indexed geometry comes to mind), but we'll
make the transition as easy as we can.
What kinds of applications are you looking at?
Yours
Dirk
--
-- Dirk Reiners Assistant Professor Iowa State University
-- Human-Computer Interaction, Computer Science
-- Snail mail: 2274 Howe Hall Room 1620F; Ames, IA 50011-2274
-- Email: [EMAIL PROTECTED], [EMAIL PROTECTED]
-- The OpenSG Open Source Scenegraph: http://www.opensg.org
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