//-----------------------------------------------------------------------
void ColourImageAffector::_initParticle(Particle* pParticle)
{
if (!mColourImageLoaded)
{
_loadImage();
}
pParticle->colour = mColourImage.getColourAt(0, 0, 0);
}
//-----------------------------------------------------------------------
void ColourImageAffector::_affectParticles(ParticleSystem* pSystem, Real timeElapsed)
{
Particle* p;
ParticleIterator pi = pSystem->_getIterator();
if (!mColourImageLoaded)
{
_loadImage();
}
int width = (int)mColourImage.getWidth() - 1;
while (!pi.end())
{
p = pi.getNext();
const Real life_time = p->totalTimeToLive;
Real particle_time = 1.0f - (p->timeToLive / life_time);
if (particle_time > 1.0f)
particle_time = 1.0f;
if (particle_time < 0.0f)
particle_time = 0.0f;
const Real float_index = particle_time * width;
const int index = (int)float_index;
if(index < 0)
{
p->colour = mColourImage.getColourAt(0, 0, 0);
}
else if(index >= width)
{
p->colour = mColourImage.getColourAt(width, 0, 0);
}
else
{
// Linear interpolation
const Real fract = float_index - (Real)index;
const Real to_colour = fract;
const Real from_colour = 1.0f - to_colour;
ColourValue from=mColourImage.getColourAt(index, 0, 0),
to=mColourImage.getColourAt(index+1, 0, 0);
p->colour.r = from.r*from_colour + to.r*to_colour;
p->colour.g = from.g*from_colour + to.g*to_colour;
p->colour.b = from.b*from_colour + to.b*to_colour;
p->colour.a = from.a*from_colour + to.a*to_colour;
}
}
}
bool TerrainQuery::getTerrainData(osg::Vec3d& location, osg::Vec4 &texture_color, std::string &coverage_name, CoverageColor &coverage_color, osg::Vec3d &inter)
{
osg::Vec3d start_location(location.x(),location.y(), -10000);
osg::ref_ptr<osgUtil::LineSegmentIntersector> intersector = new osgUtil::LineSegmentIntersector(start_location,start_location + osg::Vec3(0.0f,0.0f,20000));
m_IntersectionVisitor.setIntersector(intersector.get());
m_Terrain->accept(m_IntersectionVisitor);
if (intersector->containsIntersections())
{
osgUtil::LineSegmentIntersector::Intersections& intersections = intersector->getIntersections();
for(osgUtil::LineSegmentIntersector::Intersections::iterator itr = intersections.begin();
itr != intersections.end();
++itr)
{
const osgUtil::LineSegmentIntersector::Intersection& intersection = *itr;
osg::Vec3 tc;
osg::Texture* texture = _getTexture(intersection,tc);
if(texture && texture->getImage(0))
{
std::string tex_filename = osgDB::getSimpleFileName(texture->getImage(0)->getFileName());
//check if dds, if so we will try to load alternative image file because we have no utils to decompress dds
if(osgDB::getFileExtension(tex_filename) == "dds")
{
tex_filename = osgDB::getNameLessExtension(tex_filename) + m_ColorTextureSuffix;
//std::cout << tex_filename <<"\n";
osg::Image* image = _loadImage(tex_filename);
if(m_FlipColorCoordinates)
tc.set(tc.x(),1.0 - tc.y(),tc.z());
texture_color = image->getColor(tc);
}
else
texture_color = texture->getImage(0)->getColor(tc);
if (m_CoverageTexture != "" || m_CoverageTextureSuffix != "")
{
//get material texture
std::string mat_image_filename;
if (m_CoverageTexture != "")
mat_image_filename = m_CoverageTexture;
else
mat_image_filename = osgDB::getNameLessExtension(osgDB::getSimpleFileName(tex_filename)) + m_CoverageTextureSuffix;
osg::Image* image = _loadImage(mat_image_filename);
if (m_FlipCoverageCoordinates)
tc.set(tc.x(), 1.0 - tc.y(), tc.z());
//tc2 = osg::clampTo(tc2, osg::Vec3(0,0,0),osg::Vec3(1,1,1));
tc.set(osg::clampTo((double)tc.x(), (double) 0.0, (double) 1.0),
osg::clampTo((double)tc.y(), (double) 0.0, (double)1.0), (double)tc.z());
coverage_color = image->getColor(tc);
coverage_name = m_CoverageData.getCoverageMaterialName(coverage_color);
}
else
{
coverage_name = "WOODS";
}
}
inter = intersection.getWorldIntersectPoint();
return true;
}
}
return false;
}
