[osg-users] Why are state attributes applied when they are off?

[OpenSceneGraph Users]

Hi Vaillancourt,
I can try to answer some of your questions:

> I’m not sure I totally understand what I’m currently doing.
- Sorry, I don't know either

> Now, I’m wondering, if the Value is OFF (and it also appears to be off
when I debug the code), why is the attribute applied anyway?
- That's how this works, the attribute is applied with (boolean) value OFF.
  This might be because the default value is ON, or somewhere above your
node in the tree the attribute is set to ON.

> What would I need to do to have the attribute not applied?
  Remove it from your osgt file.

Regards, Laurens.

On Fri, Apr 3, 2020 at 2:21 PM OpenSceneGraph Users <
osg-users at lists.openscenegraph.org> wrote:

> Hello all!
>
> I’m not sure I totally understand what I’m currently doing.
>
> I’m trying to make one of our models displayable only with the “core”
> profile (using 3.3, 4.2, etc.), I seem to be able to build OSG for that
> (e.g., the code that is in ’OSG_GL_FIXED_FUNCTION_AVAILABLE’ defines is
> correctly left out), and create contexts for 3.3+.
>
> I’m using the osgsimplegl3 example as a basis, and one of the simple
> models that we have here (converted to osgt for my tests).
>
> Now, my test model contains stuff like “quads,” which I managed to remove
> manually (for now, will fix that later), and it also contains attributes
> like
> osg::Material {
>     UniqueID 4
>     Name "default"
>     Ambient  TRUE Front 0.50 0.50 0.50 1 Back 0.50 0.50 0.50 1
>     Diffuse  TRUE Front 0.91 0.91 0.91 1 Back 0.91 0.91 0.91 1
>     Specular TRUE Front 0.72 0.72 0.72 1 Back 0.72 0.72 0.72 1
>     Emission TRUE Front 0 0 0 1 Back 0 0 0 1
>     Shininess TRUE Front 10 Back 10
>   }
>   Value OFF
> osg::TexEnv {
>     UniqueID 8
>   }
>   Value OFF
>
>
> When I run the example, I get errors like those:
>
> Warning: Material::apply(State&) - not supported.
> Warning: TexEnv::apply(State&) - not supported.
>
> Looking at the code, this indicates that it’s an “error” caught by OSG,
> and it doesn’t call the OpenGL API.
>
> Now, I’m wondering, if the Value is OFF (and it also appears to be off
> when I debug the code), why is the attribute applied anyway? What would I
> need to do to have the attribute not applied?
>
> Thanks!
>
> I'm using OSG 3.6.3.
>
> --
> Vaillancourt
>
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