Re: [osg-users] osg::DrawElements - i missed something?

[Robert Gosztyla]

Hi,

I have found one interesting behaviour yet:

osg::ref_ptr < osg::UIntArray >array = new osg::UIntArray();
array->push_back( 0 );
array->push_back( 1 );
array->push_back( 2 );
array->push_back( 3 );
p_geometry->addPrimitiveSet( new osg::DrawElementsUInt( 
osg::PrimitiveSet::TRIANGLES, array->size(), & array->front() ) );

And it works. But anybody have any idea what was wrong before?
Thank you!

Cheers,
Robert

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Re: [osg-users] osg::DrawElements - i missed something?

[Robert Gosztyla]

Hi,

I have no errors, just version using draw elements is not displayed. I'm using 
VC2008 Express under Vista64 on GF9800GT. Are there any limitations using draw 
elements i should know about?

Thank you!

Cheers,
Robert

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Re: [osg-users] osg::DrawElements - i missed something?

[Wang Rui]

Hi Robert,

In fact both your code and mine work fine under my platform. It is OK to use
addElement(), too and a triangle line (made up by the first three elements
in the vertex array) will appear. Is there something wrong with your
makefile or project settings? What is the error message?

Cheers,

Wang Rui

2010/10/28 Robert Gosztyla 

> Hi,
>
> Hmm, the same effect, doesn't work (why should?). There is something wrong
> with elements->addElement() method?
>
> Thank you!
>
> Cheers,
> Robert
>
> --
> Read this topic online here:
> http://forum.openscenegraph.org/viewtopic.php?p=33151#33151
>
>
>
>
>
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Re: [osg-users] osg::DrawElements - i missed something?

[Robert Gosztyla]

Hi,

Hmm, the same effect, doesn't work (why should?). There is something wrong with 
elements->addElement() method?

Thank you!

Cheers,
Robert

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Re: [osg-users] osg::DrawElements - i missed something?

[Wang Rui]

Hi Robert,

DrawElementsUInt can make use of std::vector<> methods directly, such like:

osg::DrawElementsUInt* de = new
osg::DrawElementsUInt(osg::PrimitiveSet::LINE_LOOP);
de->push_back( 0 );
de->push_back( 1 );
de->push_back( 2 );

Or

de->resize(3);
(*de)[0] = 0;
(*de)[1] = 1;
(*de)[2] = 2;

Just have a try. :-)

Cheers,

Wang Rui


2010/10/27 Robert Gosztyla 

> Hi,
>
> Small piece of code:
>
>
> Code:
> osg::ref_ptr < osg::Vec3Array > verts = new osg::Vec3Array();
>
> verts->push_back(osg::Vec3(-100.0f, 200.0f,-100.0f ) );
> verts->push_back(osg::Vec3( 100.0f, 200.0f,-100.0f ) );
> verts->push_back(osg::Vec3( 100.0f, 200.0f, 100.0f ) );
> verts->push_back(osg::Vec3(-100.0f, 200.0f, 100.0f ) );
> verts->push_back(osg::Vec3(-100.0f, 200.0f,-100.0f ) );
>
> osg::ref_ptr < osg::DrawElements > elements = static_cast <
> osg::DrawElements* > ( new osg::DrawElementsUInt(
> osg::PrimitiveSet::LINE_LOOP ) );
>
> elements->reserveElements( 3 );
> elements->addElement( 0 );
> elements->addElement( 1 );
> elements->addElement( 2 );
>
> p_geometry->setVertexArray( verts.get() );
>
> // does not work
> p_geometry->addPrimitiveSet( elements.get() );
>
> // works
> p_geometry->addPrimitiveSet( new
> osg::DrawArrays(osg::PrimitiveSet::LINE_LOOP,0,verts->size() ) );
>
> p_geode->addDrawable( p_geometry.get() );
>
>
>
> Do you see something wrong in this code? Or I missed something?
>
> Thank you!
>
> Cheers,
> Robert
>
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> Read this topic online here:
> http://forum.openscenegraph.org/viewtopic.php?p=33127#33127
>
>
>
>
>
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