Hi J-S,
No, they won't be solid. As they are not solid in for trees drawn in
island scene. But you have to use alpha ref. On the other hand if your
transparency does not use alpha ref and sets Z-values it will still be
solid even if color buffer would end transparent.
Alpha ref? What's that? (I'm showing my ignorance, but all I know is that
our objects just have textures with alpha=0 for some texels - I don't know
anything about alpha ref)
Sorry for being imprecise. By alpha ref I meant using osg::AlphaFunc to
discard pixels with alpha lower or equal to reference value. I think that
OpenGL default is 0.0.
So I must admit I don't exactly understand why turning blending may
change depth values in shadow map. Maybe its not blending but override on
rendering bins ? I use only one bin to render shadow map - is this the
reason of your problems ?
It's true that I was oversimplifying. I always put blending and renderbin
settings in the same bucket as normally they're used together... You're
absolutely right, it's the renderbin override that causes the shadows of
my chain link fences (and other objects with textures having some texels
alpha=0) to be totally opaque.
So coming back to what you said above, what would be the right solution?
Is there a way to fix our models so that I don't have to comment out the
renderbin override in StandardShadowMap.cpp?
Otherwise, I'd submit a setter/getter control for that particular setting.
It's necessary in our situation.
I see. Maybe AlphaFunc is selectively turned on by Transparent bins and
turned off by Opaque bins and maybe thats why you see the difference when
your StateSets do not have AlphaFunc set explicitly. I must admit that we
usually set AlphaFunc in our datasbases thts probably the reason I have not
noticed this problem yet.
Ok, now I think I understand - I will submit fix for this case or if You
prefer you may do it. Basically we would want to add setter and getter for
the flag which will turn off render bin override, right ?
Cheers,
Wojtek
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