Hi, Heiko
You can use PolygonOffset state attribute on one of your drawables to beat
flickering.
Cheers, Sergey.
05.03.2011, 14:18, Heiko Thiel osgfo...@tevs.eu:
Hi,
currently I create a healthbar for a minion. So I use a billboard for it. But
now I have a problem: I want give the billboard a background. So I have
following both gemoetries:
A colored border, filled with another which is a little bit transparent.
Code:
||
| |
||
And the healthbar:
Code:
☐☐
Combined it should look like this:
Code:
||
|☐☐ |
||
But how to combine it without flickering?
Currently I have (_createHealthGemoetry ist nearly the same like
_createBackgroundGemoetry, but smaller so it fit into the other):
Code:
HealthBar::HealthBar()
{
this-setMode(osg::Billboard::POINT_ROT_EYE);
_health = 1;
_maxHealth = 1;
this-_setBillBoardStateSet();
this-addDrawable(_createBackgroundGemoetry());
this-addDrawable(_createHealthGemoetry());
}
void HealthBar::_setBillBoardStateSet()
{
osg::StateSet* billBoardStateSet = new osg::StateSet();
billBoardStateSet-setMode( GL_LIGHTING, osg::StateAttribute::OFF );
billBoardStateSet-setAttributeAndModes( new osg::BlendFunc,
osg::StateAttribute::ON );
billBoardStateSet-setRenderingHint(osg::StateSet::TRANSPARENT_BIN);
// Make sure the geometry has the correct state
this-setStateSet(billBoardStateSet);
}
osg::Drawable* HealthBar::_createBackgroundGemoetry()
{
float width = 0.8f;
float height = 0.12f;
osg::Geometry* backgroundGeometry = new osg::Geometry();
osg::Texture2D* backgroundTexture =
AssetLibrary::instance()-getTexture(healthbar/test.png);
// Declare and initialize geometry
backgroundGeometry = new osg::Geometry();
//add vertices and texture
osg::Vec3Array* verts = new osg::Vec3Array(4);
(*verts)[0] = osg::Vec3( -width/2, 0, -height/2);
(*verts)[1] = osg::Vec3( +width/2, 0, -height/2);
(*verts)[2] = osg::Vec3( +width/2, 0, +height/2);
(*verts)[3] = osg::Vec3( -width/2, 0, +height/2);
backgroundGeometry-setVertexArray(verts);
osg::Vec2Array* texCoords = new osg::Vec2Array(4);
(*texCoords)[0].set(0.0f, 0.0f);
(*texCoords)[1].set(1.0f, 0.0f);
(*texCoords)[2].set(1.0f, 1.0f);
(*texCoords)[3].set(0.0f, 1.0f);
backgroundGeometry-setTexCoordArray(0, texCoords);
osg::StateSet* stateSet = new osg::StateSet();
stateSet-setTextureAttributeAndModes(0, backgroundTexture,
osg::StateAttribute::ON);
backgroundGeometry-setStateSet(stateSet);
// Add a primitive set (QUADS) to the geometry
backgroundGeometry-addPrimitiveSet(new
osg::DrawArrays(osg::PrimitiveSet::QUADS,0,4));
osg::Vec4Array* colors = new osg::Vec4Array;
colors-push_back(osg::Vec4(1.0f, 1.0f, 1.0f, 1.0f));
backgroundGeometry-setColorArray(colors);
backgroundGeometry-setColorBinding(osg::Geometry::BIND_OVERALL);
return backgroundGeometry;
}
Thank you!
Cheers,
Heiko
--
Read this topic online here:
http://forum.openscenegraph.org/viewtopic.php?p=37364#37364
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