Hi Sebastian,
sorry I missed your reply.
SMesserschmidt wrote:
>
> Most probably your problem is lighting. Your surface is shaded correctly
> while your wireframe stays constant. At a certain angle the lit result is
> simply the same color as your constant wireframe.
>
I think you are right. That's what happening. Now I don't remember exactly what
I tried few months ago but if it is simply to reach, what should I do to make
the wireframe color just a little bit darker with respect to the surface color
at every view angle?
SMesserschmidt wrote:
>
> Can you present the relevant code, where you set up the wireframe?
>
Please see attached cpp file.
Regards,
Gianni
------------------
Read this topic online here:
http://forum.openscenegraph.org/viewtopic.php?p=71280#71280
#include <osg/Depth>
#include <osg/Light>
#include <osg/Material>
#include <osg/PolygonMode>
#include <osg/PolygonOffset>
#include "Wireframable.h"
//-----------------------------------------------------------------------------
Wireframable::Wireframable()
{
decorator = new osg::Group;
decorator->setName("wireframe");
decorator->setNodeMask(0x0); //disable wireframe by default
setPolygonMode();
setMaterial(osg::Vec4(0.5, 0.5f, 0.5f, 1.0f));
}
//-----------------------------------------------------------------------------
Wireframable::Wireframable(const Wireframable& iOther)
: viframework::viobjects::SmartPointer(iOther)
{
}
//-----------------------------------------------------------------------------
void Wireframable::enableWireframe(bool iEnable)
{
decorator->setNodeMask(static_cast<osg::Node::NodeMask>(iEnable));
}
//-----------------------------------------------------------------------------
void Wireframable::enableLighting(bool enable)
{
decorator->getOrCreateStateSet()->setMode(GL_LIGHTING,
osg::StateAttribute::OVERRIDE | enable ? osg::StateAttribute::ON :
osg::StateAttribute::OFF);
}
//-----------------------------------------------------------------------------
bool Wireframable::isWireframeEnabled() const
{
return static_cast<bool>(decorator->getNodeMask());
}
//-----------------------------------------------------------------------------
void Wireframable::setMaterial(const osg::Vec4& color)
{
#if 0
//osg::Material* material = new osg::Material;
//decorator->getOrCreateStateSet()->setAttributeAndModes(material,
osg::StateAttribute::OVERRIDE | osg::StateAttribute::ON);
//enableLighting(false);
//osg::Material* material = new osg::Material;
//decorator->getOrCreateStateSet()->setMode(GL_LIGHTING,
osg::StateAttribute::OVERRIDE | osg::StateAttribute::OFF);
decorator->getOrCreateStateSet()->setAttributeAndModes(new
osg::Depth(osg::Depth::ALWAYS, 0.0, 1.0, false), osg::StateAttribute::ON);
//decorator->getOrCreateStateSet()->setMode(GL_DEPTH_TEST,
osg::StateAttribute::OVERRIDE | osg::StateAttribute::OFF);
//decorator->getOrCreateStateSet()->setAttributeAndModes(material,
osg::StateAttribute::OVERRIDE | osg::StateAttribute::ON);
#else
// version which sets the color of the wireframe.
osg::Material* material = new osg::Material;
material->setColorMode(osg::Material::OFF); // switch glColor usage off
// turn all lighting off
material->setAmbient(osg::Material::FRONT_AND_BACK, osg::Vec4(0.0, 0.0f,
0.0f, 1.0f));
material->setDiffuse(osg::Material::FRONT_AND_BACK, osg::Vec4(0.0, 0.0f,
0.0f, 1.0f));
material->setSpecular(osg::Material::FRONT_AND_BACK, osg::Vec4(0.0, 0.0f,
0.0f, 1.0f));
// except emission... in which we set the color we desire
material->setEmission(osg::Material::FRONT_AND_BACK, color);
decorator->getOrCreateStateSet()->setAttributeAndModes(material,
osg::StateAttribute::OVERRIDE | osg::StateAttribute::ON);
enableLighting(true);
#endif
}
//-----------------------------------------------------------------------------
void Wireframable::setNode(osg::ref_ptr<osg::Node> iNode)
{
bool nodeAlreadySet = false;
if (iNode->getParents().size()>0) {
// call from GraphicObject copy constructor: decorator is already a child
of node's parent
osg::Group* parent = iNode->getParent(0);
for (unsigned int i = 0; i<parent->getNumChildren(); ++i) {
if ("wireframe" == parent->getChild(i)->getName()) {
decorator = static_cast<osg::Group*>(parent->getChild(i));
decorator->addChild(iNode); // we need to repeate this because
DEEP_COPY_ALL does not keep the relation
nodeAlreadySet = true;
break;
}
}
}
if (false == nodeAlreadySet) {
decorator->addChild(iNode);
iNode->getParent(0)->addChild(decorator);
}
}
//-----------------------------------------------------------------------------
void Wireframable::setPolygonMode()
{
osg::PolygonMode* polymode = new osg::PolygonMode;
polymode->setMode(osg::PolygonMode::FRONT_AND_BACK, osg::PolygonMode::LINE);
decorator->getOrCreateStateSet()->setAttributeAndModes(polymode,
osg::StateAttribute::OVERRIDE | osg::StateAttribute::ON);
}
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