[osg-users] Bug with applying global default attributes?

OpenSceneGraph Users osg-users at lists.openscenegraph.org
Wed Jan 29 10:22:15 PST 2020

I have been testing with trunk and have only come across one problem so 
far (this might not be a new issue).

I have a simple viewer set up with two nodes.  The first is loaded from 
an osgb.  Internally it sets the glBlendFunci(0, GL_MAX) via 

The second node also sets glBlendFunci(0, GL_MAX).  This is a geode with 
a geometry node under it.  I am setting the blend attributes on the 
geometry state set.

At runtime the attribute on node two is set correctly but then 
immediately changed again by State::ApplyGlobalDefaultAttribute to 
GL_FUNC_ADD.  The blend equation is also stepped on in a similar way.  I 
am using apitrace to see the GL calls.

GL_FUNC_ADD is not part of either node that I can see.  However, this 
problem does not occur with, for example, axes.osgt used as node one.

I could use some advice on tracking down where this default value is 
coming from, and why it is overriding a specific node attribute like this.



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