Update to my previous email.
float height = (center-control)*normal;
osg::Vec3d centroid(center - normal*height);
for(Edges::iterator eitr = edges.begin();
eitr != edges.end();
++eitr)
{
if (eitr->second==1)
{
const Edge& edge = eitr->first;
Face face;
face.name = "baseSide";
face.plane.set(centroid, edge.first, edge.second);
face.vertices.push_back(centroid);
face.vertices.push_back(edge.first);
face.vertices.push_back(edge.second);
if (face.plane.distance(center)<0.0) face.plane.flip();
_faces.push_back(face);
uniqueVertices.insert(edge.first);
uniqueVertices.insert(edge.second);
}
}
float minHeight = -1;
{
Vertices baseVertices;
for(VertexSet::iterator itr = uniqueVertices.begin();
itr != uniqueVertices.end();
++itr)
{
const osg::Vec3d& point = *itr;
double h_point = point * normal;
osg::Vec3d newpoint = point - normal * (h_point - minHeight);
baseVertices.push_back(newpoint);
}
//compute centroid of the base vertices
osg::Vec3d center;
double totalArea = 0;
for(unsigned int i=0; i<baseVertices.size()-1; ++i)
{
const osg::Vec3d& a = baseVertices[i];
const osg::Vec3d& b = baseVertices[i+1];
const osg::Vec3d& c = baseVertices[(i+2)%baseVertices.size()];
double area = ((a-b)^(b-c)).length()*0.5;
osg::Vec3d localCenter = (a+b+c)/3.0;
center += localCenter*area;
totalArea += area;
}
center /= totalArea;
osg::Vec3d normal(center-centroid);
normal.normalize();
osg::Plane basePlane(normal, center);
cut(basePlane,"basePlane");
}
I hope you might find it useful.
Cheers,
MattFranklin
------------------
Read this topic online here:
http://forum.openscenegraph.org/viewtopic.php?p=13431#13431
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