Robert,
Thank you for the suggestions. I didn't see a big difference in the OSG
files, but I did find the cause: operator error. In the script that
runs the 2.8-1 application, we were enabling two-sided lighting.
So, now my question is: how do I fix transparency when two-sided
lighting is enabled for a scene? I think we're lucky in that the models
we have that require two-sided lighting aren't the same ones that have
transparent objects. But it would be nice to understand the phenomenon.
-Todd
Robert Osfield wrote:
Hi Todd,
I can't say why your are having problems with transparency in 2.8.1 vs
2.4, as depth sorted/transparent bin hasn't changed between these
versions. Perhaps a subtle difference in the loader has caused the
difference, or perhaps there is something undefined in your data that
the two versions behavior differently with. It's a bit of a case of
hunting for a needle in a hay stack so you'll need to try and isolate
the different possibilities.
Try converting your data to .osg and see if the two different versions
behave differently with this, even bettern convert the .ive to .osg
using 2.4, then do the same with 2.8.1 and then have a look at the
differences, if they are effectively the same then go have a look .osg
file to make sure that the objects that you think are transparent are
correctly assigned, and also check to see if all the geometries have
vertex, normal and colour arrays as required by the state setup in
your scene graph.
Robert.
On Fri, Jun 5, 2009 at 1:28 PM, Todd J. Furlong<t...@inv3rsion.com> wrote:
I'm not sure if this is related to the "transparency problem" thread, so I
thought I'd start a new one.
We have an osgUtil::SceneView - based application that uses VR Juggler for
rendering on a visualization cluster. Our previous version was built with
OSG 2.4, and now we are using OSG 2.8.1.
We also have a set of IVE files created in OSG 2.4. Transparent objects
(non-textured) were placed in the transparent bin on conversion to IVE, and
those objects render fine the OSG 2.4 version of our application. In the OSG
2.8.1 version of the application, we are getting mixed results: Sometimes
transparency is OK, but other times the transparent objects appear opaque.
Sometimes, different nodes of the cluster will render geometry opaque while
others render it transparent.
Is this related to depth sorting? What has changed between OSG versions
that might cause this? And can I correct it easily to get transparent
objects working again?
Thanks,
Todd
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