Hi,
I have a simple scene where I create a textured quad, and then add some simple
objects to it (spheres, lines, etc). Using the ubuntu distro OSG (3.0.0 I
believe), this was working fine. When I upgraded to 3.3.0, adding the new
objects now seems to overwrite the colors in the texture - for example, if I
have an image showing on the quad, and add a green(0, 1, 0, 1) line to the
scene, the image becomes a greenscale version of itself. If i continue to add
objects of other colors, the most recently added object/color takes precedence.
I tracked this down to commit eb7929b85ad87316a2437da03b4bb810cded7366:
Added SceneView::Options enum enetries APPLY_GLOBAL_DEFAULTS and
CLEAR_GLOBAL_STATESET to control whether a _globalStateSet->clear() and
_globalStateSet->setGlobalDefaults() should be called.
osgViewer::Renderer doesn't use these enum settings so now no longer has a
calls StateSet::clear() or StateSet::setGlobalDefaults() on the osg::Camera's
StateSet. Previously these were being called and breaking the ability to
attached state to Camera's StateSet.
I am inheriting CompositeViewer, so it seems to me that with the removal of
StateSet::Clear() in osgViewer, some behavior has changed that is allowing the
stateset of the texture to get overwritten when new objects are added. Likely,
there is a bug in my program that was hidden by the old behavior. So here are
some snippets.
Code:
//Setting up the texture
m_texture = new osg::Texture2D(img);
m_texture->setResizeNonPowerOfTwoHint(false);
m_texture->setDataVariance(osg::Object::DYNAMIC);
m_texture->setWrap(osg::Texture::WRAP_S, osg::Texture::CLAMP_TO_EDGE);
m_texture->setWrap(osg::Texture::WRAP_T, osg::Texture::CLAMP_TO_EDGE);
m_texture->setFilter(osg::Texture::MIN_FILTER, osg::Texture::LINEAR);
m_texture->setFilter(osg::Texture::MAG_FILTER, osg::Texture::LINEAR);
//setting up the quad
int w = m_quad_size.x();
int h = m_quad_size.y();
osg::Vec3Array* vertices = new osg::Vec3Array;
vertices->push_back( osg::Vec3(-w/2, 0, h/2) ); // front left
vertices->push_back( osg::Vec3(w/2, 0, h/2) ); // front right
vertices->push_back( osg::Vec3(w/2, 0, -h/2) ); // back right
vertices->push_back( osg::Vec3(-w/2, 0, -h/2) ); // back left
osg::Vec2Array *texcoord = new osg::Vec2Array;
texcoord->push_back(osg::Vec2(0.0, 0.0));
texcoord->push_back(osg::Vec2(1.0, 0.0));
texcoord->push_back(osg::Vec2(1.0, 1.0));
texcoord->push_back(osg::Vec2(0.0, 1.0));
osg::Geometry *geom = new osg::Geometry;
geom->setVertexArray(vertices);
geom->setTexCoordArray(0, texcoord);
geom->addPrimitiveSet(new osg::DrawArrays(GL_QUADS, 0, 4));
osg::Geode *geode = new osg::Geode;
geode->addDrawable(geom);
geode->getOrCreateStateSet()->setTextureAttributeAndModes(0, texture,
osg::StateAttribute::ON);
//Creating a line to add
osg::ref_ptr<osg::Geode> geode = new osg::Geode;
osg::ref_ptr<osg::Geometry> geometry = new osg::Geometry();
osg::ref_ptr<osg::Vec3Array> vertices = new osg::Vec3Array(2);
(*vertices)[0].set(p1[0], p1[1], p1[2]);
(*vertices)[1].set(p2[0], p2[1], p2[2]);
geometry->setVertexArray(vertices);
osg::ref_ptr<osg::Vec4Array> colors = new osg::Vec4Array;
colors->push_back(color);
geometry->setColorArray(colors);
geometry->setColorBinding(osg::Geometry::BIND_OVERALL);
osg::ref_ptr<osg::Vec3Array> normals = new osg::Vec3Array;
normals->push_back(osg::Vec3(0.0f,-1.0f,0.0f));
geometry->setNormalArray(normals);
geometry->setNormalBinding(osg::Geometry::BIND_OVERALL);
geometry->addPrimitiveSet(new osg::DrawArrays(osg::PrimitiveSet::LINES,0,2));
geometry->setUseDisplayList(false);
osg::ref_ptr<osg::StateSet> state = new osg::StateSet();
if (no_depth_test) {
state->setMode(GL_DEPTH_TEST, osg::StateAttribute::OFF);
}
state->setRenderBinDetails(100, "RenderBin");
geode->setStateSet(state);
geode->addDrawable(geometry);
The quad and the line are both children of an osg::Group that is set as the
osgViewer::View's scenedata.
Thank you!
Cheers,
Nick
Code:
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Read this topic online here:
http://forum.openscenegraph.org/viewtopic.php?p=57705#57705
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