Hello Trajce,
The visitor class implementation is on my previous post on this thread. I took
that code from Gordon Tomlison's OSG Samples, and it works when is used
previous to the rendering as you can see on my initial post (other thread:
http://forum.openscenegraph.org/viewtopic.php?p=75209#75209).
As I said everything gets called when it should, but on runtime, the lines
wont change color. I you look at the code snippet of my main:
Code:
_lines = osgDB::readNodeFile("lines.dxf");
_topo->setDataVariance(osg::Object::DYNAMIC);
osg::Geode* geode = new osg::Geode;
_mViewer->addEventHandler(new ColorHandler);
ColorVisitor newColor;
newColor.setColor( 1.0f, 0.0f, 0.0f );
_lines->accept(newColor);
geode->addChild(_lines);
_mViewer->realize();
The color of the lines turns red on start. But then, when I try to change it to
another color on runetime, nothing happens.
Anyway, here is the visitor implementation (.cpp):
Code:
ColorVisitor::ColorVisitor():
osg::NodeVisitor(osg::NodeVisitor::TRAVERSE_ALL_CHILDREN)
{
m_color.set(1.0, 1.0, 1.0, 1.0);
m_colorArrays = new osg::Vec4Array;
m_colorArrays->push_back(m_color);
};
ColorVisitor::ColorVisitor(const osg::Vec4 &color):
osg::NodeVisitor(osg::NodeVisitor::TRAVERSE_ALL_CHILDREN)
{
m_color = color;
m_colorArrays = new osg::Vec4Array;
m_colorArrays->push_back(m_color);
};
ColorVisitor::~ColorVisitor()
{
};
void ColorVisitor::apply(osg::Node &node) {
// --------------------------------------------
//
// Handle traversal of osg::Node node types
//
// --------------------------------------------
traverse(node);
};
void ColorVisitor::apply(osg::Geode &geode) {
// ------------------------------------------------
//
// Handle traversal of osg::Geode node types
//
// ------------------------------------------------
osg::StateSet *state = NULL;
unsigned int vertNum = 0;
//
// We need to iterate through all the drawables check if
// the contain any geometry that we will need to process
//
unsigned int numGeoms = geode.getNumDrawables();
for (unsigned int geodeIdx = 0; geodeIdx < numGeoms; geodeIdx++)
{
//
// Use 'asGeometry' as its supposed to be faster than a dynamic_cast
// every little saving counts
//
osg::Geometry *curGeom = geode.getDrawable(geodeIdx)->asGeometry();
//
// Only process if the drawable is geometry
//
if (curGeom)
{
osg::Vec4Array *colorArrays = dynamic_cast<osg::Vec4Array
*>(curGeom->getColorArray());
if (colorArrays) {
for (unsigned int i = 0; i < colorArrays->size(); i++)
{
osg::Vec4 *color = &colorArrays->operator [](i);
//
// could also use *color = m_color
//
color->set(m_color._v[0], m_color._v[1], m_color._v[2],
m_color._v[3]);
}
}
else
{
curGeom->setColorArray(m_colorArrays.get());
curGeom->setColorBinding(osg::Geometry::BIND_OVERALL);
}
}
}
};
void ColorVisitor::setColor(const float r, const float g, const float b, const
float a)
{
// -------------------------------------------------------------------
//
// Set the color to change apply to the nodes geometry
//
// -------------------------------------------------------------------
osg::Vec4 *c = &m_colorArrays->operator [](0);
m_color.set(r, g, b, a);
*c = m_color;
};
void ColorVisitor::setColor(const osg::Vec4 &color) {
// -------------------------------------------------------------------
//
// Set the color to change apply to the nodes geometry
//
// -------------------------------------------------------------------
osg::Vec4 *c = &m_colorArrays->operator [](0);
m_color = color;
*c = m_color;
};
Cheers,
------------------
Read this topic online here:
http://forum.openscenegraph.org/viewtopic.php?p=75248#75248
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