Hi,
I want to draw an icon using texture. My texture image is an image of 8x8 pixel
size. It looks like quadrate without center (center is transparent). Border
width of this quadrate is one pixel.
When I moving camera with the mouse - border size of icon changed. It can also
disappear.
How can I provide permanent width of quadrate border (1 pixel, as in a texture)
My code to add icon on the scene.
Code:
osg::ref_ptr<osg::Node> createTexture()
{
osg::ref_ptr<osg::Image> image = osgDB::readImageFile("8x8.png");
float width = image->s();
float height = image->t();
osg::Geometry* geometry = new osg::Geometry;
osg::Vec3Array* verts = new osg::Vec3Array(4);
(*verts)[0] = osg::Vec3(-width/2.0f, -height/2.0, 0.0f);
(*verts)[1] = osg::Vec3(width/2.0f, -height/2.0, 0.0f);
(*verts)[2] = osg::Vec3(width/2.0f, height/2.0, 0.0f);
(*verts)[3] = osg::Vec3(-width/2.0f,height/2.0, 0.0f);
geometry->setVertexArray( verts );
osg::Vec2Array* texcoords = new osg::Vec2Array(4);
(*texcoords)[0].set(0.0f, 0.0f);
(*texcoords)[1].set(width, 0.0f);
(*texcoords)[2].set(width, height);
(*texcoords)[3].set(0.0f, height);
geometry->setTexCoordArray(0, texcoords);
osg::Vec4Array* colors = new osg::Vec4Array(1);
(*colors)[0].set(1,1,1,1);
geometry->setColorArray( colors );
geometry->setColorBinding( osg::Geometry::BIND_OVERALL );
geometry->addPrimitiveSet( new osg::DrawArrays(GL_QUADS, 0, 4));
osg::StateSet* stateSet = geometry->getOrCreateStateSet();
osg::TextureRectangle* texture = new osg::TextureRectangle( image );
texture->setFilter(osg::Texture::MIN_FILTER, osg::Texture::NEAREST);
texture->setFilter(osg::Texture::MAG_FILTER, osg::Texture::NEAREST);
stateSet->setTextureAttributeAndModes(0, texture, osg::StateAttribute::ON);
stateSet->setRenderingHint(osg::StateSet::TRANSPARENT_BIN);
stateSet->setAttributeAndModes( new osg::Depth(osg::Depth::ALWAYS,false), 1 );
osg::Geode* geode = new osg::Geode;
geode->addDrawable( geometry );
osg::AutoTransform* at = new osg::AutoTransform;
at->setAutoScaleToScreen( true );
at->setAutoRotateMode( osg::AutoTransform::ROTATE_TO_SCREEN );
at->addChild( geode );
return at;
}
Thank you![/code]
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http://forum.openscenegraph.org/viewtopic.php?p=64511#64511
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