Why can't ive format model texture show when turn on setUseVertexAttributeAliasing(true)?

[mirr...@gmail.com]

env is system Win10 ,osg 3.6.4, osgearth 2.10.0,GTX1660 TI

Why is there an error in the model texture display when this function is turn on?

 const int width( 800 ), height( 450 );

    const std::string version( "4.3" );

    osg::ref_ptr< osg::GraphicsContext::Traits > traits = new osg::GraphicsContext::Traits();

    traits->x = 20; traits->y = 30;

    traits->width = width; traits->height = height;

    traits->windowDecoration = true;

    traits->doubleBuffer = true;

    traits->glContextVersion = version;

    traits->readDISPLAY();

    traits->setUndefinedScreenDetailsToDefaultScreen();

    osg::ref_ptr< osg::GraphicsContext > gc = osg::GraphicsContext::createGraphicsContext( traits.get() );

    if( !gc.valid() )

    {

        osg::notify( osg::FATAL ) << "Unable to create OpenGL v" << version << " context." << std::endl;

        return( 1 );

    }

[OpenSceneGraph Users]

Hi ?

OpenGL and OSG strandles and old fixed function pipeline era and shaders.  You can select a pure shaders subset of OpenGL at compile time and runtime, and you can also toggle on/off some mappings the OSG provide between the GL2.x GLSL built in variables and osg_ equivalents useful for GLES2.x/GL3.x+. 

The scene graphs you build for each of these scenarios will need to be different - you can't use fixed function pipeline state with a GL version that only supports shaders.  I know nothing about your particular .ive but my best guess is that it's not compatible with the subset of OpenGL you selecting.

Robert.

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[mirr...@gmail.com]

Thank you for your questions,    Do you mean to  use this  setUseVertexAttributeAliasing(true)  only in GL version that only supports shaders  ?  

[OpenSceneGraph Users]

On Sat, 17 Oct 2020 at 18:15, OpenSceneGraph Users <osg-...@lists.openscenegraph.org> wrote:

Thank you for your questions,    Do you mean to  use this  setUseVertexAttributeAliasing(true)  only in GL version that only supports shaders  ?  

Vertex aliasing only affects scene graphs that use shaders, they don't affect the OpenGl fixed function pipeline.

The OSG tests for shader support at runtime so even older versions of OpenGL prior to GL2 can use shaders.

However, if you build against GL core profile or GLES2.x of greater then there is no fixed function pipeline so all OSG usage will need to use shaders.

Robert.