Have you considered setting BlendColor at the parent Group node and using one of
the blend function parameters that use constant color?
-Paul
Phil Fugue wrote:
Hi,
I'm still fairly new to OSG and finding my way around. I have a little problem
that I need done very quickly, so hope someone can help.
I'm trying to apply alpha to a group node so it affects all geometry under it
while preserving their other material properties.
I've loaded a .lwo model, that comes with its own materials. It has several
different materials applied to its various parts. I need to control the
transparency of the whole model at once. I can make a new osg::Material, set
the alpha and apply it to the top node, that works, but then I lose all the
materials the model came with, and gives me default greys.
How can I just modify the alpha of the whole thing and leave the rest alone?
I've tried 'getting' the material and setting the alpha to that, but it crashes
on the setAlpha call. (Although I'm probably handling something wrong there,
since there are several materials involved, not just one).
Do I need to recurse thru the model's scene graph, get each material, and set
alpha individually? If thats the case, ok, but could someone show me some quick
code to do that? Like I said, I've been crashing on setting alpha in the
material I 'get', and also I've never recursed thru an imported model before,
(which I will eventually need to do anyway).
Any help is appreciated
Thank you!
Cheers,
Phil
------------------
Read this topic online here:
http://forum.openscenegraph.org/viewtopic.php?p=30882#30882
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--
-Paul Martz Skew Matrix Software
http://www.skew-matrix.com/
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