Implemnet clampping of ovleray polytope to base plane
This commit is contained in:
Robert Osfield
parent
27173bdf73
commit
74d19eed34
@ -202,7 +202,7 @@ public:
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}
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void insertVertex(const osg::Vec3d& vertex)
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void insertVertex(const osg::Vec3d& vertex, osg::EllipsoidModel* em=0, double minHeight=0.0)
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{
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// osg::notify(osg::NOTICE)<<"Inserting vertex "<<vertex<<std::endl;
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@ -254,6 +254,9 @@ public:
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if (numVerticesAdded==0.0) return;
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center /= numVerticesAdded;
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typedef std::set<osg::Vec3> VertexSet;
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VertexSet uniqueVertices;
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for(Edges::iterator eitr = edges.begin();
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eitr != edges.end();
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++eitr)
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@ -268,16 +271,62 @@ public:
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face.vertices.push_back(edge.first);
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face.vertices.push_back(edge.second);
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if (face.plane.distance(center)<0.0) face.plane.flip();
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_faces.push_back(face);
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uniqueVertices.insert(edge.first);
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uniqueVertices.insert(edge.second);
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}
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}
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// now trim the new polytope back the desired height
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if (em)
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{
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// compute the base vertices at the new height
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Vertices baseVertices;
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for(VertexSet::iterator itr = uniqueVertices.begin();
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itr != uniqueVertices.end();
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++itr)
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{
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const osg::Vec3d& point = *itr;
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double latitude, longitude, height;
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em->convertXYZToLatLongHeight(point.x(), point.y(), point.z(), latitude, longitude, height);
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osg::Vec3d normal(point);
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normal.normalize();
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baseVertices.push_back(point - normal * (height - minHeight));
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}
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//compute centroid of the base vertices
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osg::Vec3d center;
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double totalArea = 0;
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for(unsigned int i=0; i<baseVertices.size()-1; ++i)
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{
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const osg::Vec3d& a = baseVertices[i];
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const osg::Vec3d& b = baseVertices[i+1];
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const osg::Vec3d& c = baseVertices[(i+2)%baseVertices.size()];
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double area = ((a-b)^(b-c)).length()*0.5;
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osg::Vec3d localCenter = (a+b+c)/3.0;
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center += localCenter*area;
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totalArea += area;
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}
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center /= totalArea;
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osg::Vec3d normal(center);
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normal.normalize();
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osg::Plane basePlane(normal, center);
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cut(basePlane);
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}
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// osg::notify(osg::NOTICE)<<" Removed faces "<<removedFaces.size()<<std::endl;
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}
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void projectDowntoBase(const osg::Vec3d& normal, double minHeight)
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{
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osg::notify(osg::NOTICE)<<"CustomPolytop::projectDowntoBase not implementated yet."<<std::endl;
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}
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void cut(const osg::Polytope& polytope)
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{
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@ -621,7 +670,7 @@ OverlayNode::OverlayData& OverlayNode::getOverlayData(osgUtil::CullVisitor* cv)
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if (!overlayData._texture)
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{
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osg::notify(osg::NOTICE)<<" setting up texture"<<std::endl;
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// osg::notify(osg::NOTICE)<<" setting up texture"<<std::endl;
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osg::Texture2D* texture = new osg::Texture2D;
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texture->setTextureSize(tex_width, tex_height);
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@ -630,15 +679,18 @@ OverlayNode::OverlayData& OverlayNode::getOverlayData(osgUtil::CullVisitor* cv)
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texture->setFilter(osg::Texture2D::MAG_FILTER,osg::Texture2D::LINEAR);
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texture->setWrap(osg::Texture2D::WRAP_S,osg::Texture2D::CLAMP_TO_BORDER);
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texture->setWrap(osg::Texture2D::WRAP_T,osg::Texture2D::CLAMP_TO_BORDER);
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#if 1
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texture->setBorderColor(osg::Vec4(_overlayClearColor));
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#else
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texture->setBorderColor(osg::Vec4(1.0,0.0,0.0,0.5));
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#endif
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overlayData._texture = texture;
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}
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// set up the render to texture camera.
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if (!overlayData._camera)
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{
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osg::notify(osg::NOTICE)<<" setting up camera"<<std::endl;
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// osg::notify(osg::NOTICE)<<" setting up camera"<<std::endl;
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// create the camera
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overlayData._camera = new osg::Camera;
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@ -768,8 +820,10 @@ void OverlayNode::traverse_OBJECT_DEPENDENT_WITH_ORTHOGRAPHIC_OVERLAY(osg::NodeV
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csn = dynamic_cast<osg::CoordinateSystemNode*>(*itr);
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}
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osg::EllipsoidModel* em = csn ? csn->getEllipsoidModel() : 0;
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if (csn)
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if (em)
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{
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osg::Vec3d eyePoint(0.0,0.0,0.0); // center of the planet
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double centerDistance = (eyePoint-osg::Vec3d(bs.center())).length();
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@ -916,6 +970,8 @@ void OverlayNode::traverse_VIEW_DEPENDENT_WITH_ORTHOGRAPHIC_OVERLAY(osg::NodeVis
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csn = dynamic_cast<osg::CoordinateSystemNode*>(*itr);
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}
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osg::EllipsoidModel* em = csn ? csn->getEllipsoidModel() : 0;
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osg::BoundingSphere bs = _overlaySubgraph->getBound();
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@ -969,9 +1025,15 @@ void OverlayNode::traverse_VIEW_DEPENDENT_WITH_ORTHOGRAPHIC_OVERLAY(osg::NodeVis
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_overlaySubgraph->accept(cbbv);
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overlayPolytope.setToBoundingBox(cbbv.getBoundingBox());
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if (csn)
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if (em)
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{
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overlayPolytope.insertVertex(osg::Vec3d(0.0,0.0,0.0));
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double minHeight = -1000.0;
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overlayPolytope.insertVertex(osg::Vec3d(0.0,0.0,0.0), em, minHeight);
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}
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else
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{
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double minHeight = -1000.0;
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overlayPolytope.projectDowntoBase(osg::Vec3d(0.0,0.0,1.0), minHeight);
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}
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@ -982,20 +1044,15 @@ void OverlayNode::traverse_VIEW_DEPENDENT_WITH_ORTHOGRAPHIC_OVERLAY(osg::NodeVis
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if (overlayData._geode.valid())
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{
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overlayData._geode->addDrawable(overlayPolytope.createDrawable(osg::Vec4d(1.0f,1.0f,0.0f,1.0f)));
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overlayData._geode->addDrawable(frustum.createDrawable(osg::Vec4d(0.0f,0.0f,1.0f,1.0f)));
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//overlayData._geode->addDrawable(overlayPolytope.createDrawable(osg::Vec4d(1.0f,1.0f,0.0f,1.0f)));
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//overlayData._geode->addDrawable(frustum.createDrawable(osg::Vec4d(0.0f,0.0f,1.0f,1.0f)));
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}
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CustomPolytope::Vertices corners;
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#if 0
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// frustum.cut(overlayPolytope);
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frustum.getPoints(corners);
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#else
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overlayPolytope.cut(frustum);
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overlayPolytope.getPoints(corners);
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#endif
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if (overlayData._geode.valid())
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{
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@ -1004,7 +1061,7 @@ void OverlayNode::traverse_VIEW_DEPENDENT_WITH_ORTHOGRAPHIC_OVERLAY(osg::NodeVis
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osg::notify(osg::NOTICE)<<"AFTER CUT corners = "<<corners.size()<<std::endl;
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// osg::notify(osg::NOTICE)<<"AFTER CUT corners = "<<corners.size()<<std::endl;
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if (corners.empty()) return;
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@ -1013,20 +1070,23 @@ void OverlayNode::traverse_VIEW_DEPENDENT_WITH_ORTHOGRAPHIC_OVERLAY(osg::NodeVis
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osg::Vec3d lookVector(0.0,0.0,-1.0);
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if (csn)
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if (em)
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{
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lookVector = -center;
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lookVector.normalize();
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}
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//osg::Vec3d sideVector = lookVector ^ frustum_axis;
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#if 1
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osg::Vec3d sideVector = lookVector ^ frustum_axis;
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#else
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osg::Vec3d sideVector = lookVector ^ osg::Vec3d(0.0,0.0,1.0);
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#endif
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sideVector.normalize();
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osg::Vec3d upVector = sideVector ^ lookVector;
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upVector.normalize();
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osg::notify(osg::NOTICE)<<" lookVector ="<<lookVector<<std::endl;
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// osg::notify(osg::NOTICE)<<" lookVector ="<<lookVector<<std::endl;
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double min_side = DBL_MAX;
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double max_side = -DBL_MAX;
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@ -1047,30 +1107,23 @@ void OverlayNode::traverse_VIEW_DEPENDENT_WITH_ORTHOGRAPHIC_OVERLAY(osg::NodeVis
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if (distance_up>max_up) max_up = distance_up;
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}
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osg::notify(osg::NOTICE)<<" upVector ="<<upVector<<" min="<<min_side<<" max="<<max_side<<std::endl;
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osg::notify(osg::NOTICE)<<" sideVector ="<<sideVector<<" min="<<min_up<<" max="<<max_up<<std::endl;
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// osg::notify(osg::NOTICE)<<" upVector ="<<upVector<<" min="<<min_side<<" max="<<max_side<<std::endl;
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// osg::notify(osg::NOTICE)<<" sideVector ="<<sideVector<<" min="<<min_up<<" max="<<max_up<<std::endl;
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osg::notify(osg::NOTICE)<<" delta_up = "<<max_up-min_up<<std::endl;
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osg::notify(osg::NOTICE)<<" delta_side = "<<max_side-min_side<<std::endl;
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// osg::notify(osg::NOTICE)<<" delta_up = "<<max_up-min_up<<std::endl;
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// osg::notify(osg::NOTICE)<<" delta_side = "<<max_side-min_side<<std::endl;
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double bs_center = (bs.center()-center) * lookVector;
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double bs_near = bs_center-bs.radius();
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double bs_far = bs_center+bs.radius();
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osg::notify(osg::NOTICE)<<" bs_near="<<bs_near<<" bs_far="<<bs_far<<std::endl;
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osg::notify(osg::NOTICE)<<" bs.radius()="<<bs.radius()<<std::endl;
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// osg::notify(osg::NOTICE)<<" bs_near="<<bs_near<<" bs_far="<<bs_far<<std::endl;
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// osg::notify(osg::NOTICE)<<" bs.radius()="<<bs.radius()<<std::endl;
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#if 0
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camera->setProjectionMatrixAsOrtho(min_side,max_side,min_up,max_up,bs_near+bs.center().length(),bs_far+bs.center().length());
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camera->setViewMatrixAsLookAt(osg::Vec3d(0.0f,0.0f,0.0f), bs.center(), upVector);
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#else
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camera->setProjectionMatrixAsOrtho(min_side,max_side,min_up,max_up,-bs.radius(),bs.radius());
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camera->setViewMatrixAsLookAt(bs.center(), osg::Vec3d(0.0f,0.0f,0.0f), upVector);
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#endif
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// compute the matrix which takes a vertex from local coords into tex coords
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@ -1088,7 +1141,7 @@ void OverlayNode::traverse_VIEW_DEPENDENT_WITH_ORTHOGRAPHIC_OVERLAY(osg::NodeVis
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overlayData._textureFrustum.setToUnitFrustum(false,false);
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overlayData._textureFrustum.transformProvidingInverse(MVP);
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osg::notify(osg::NOTICE)<<std::endl;
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// osg::notify(osg::NOTICE)<<std::endl;
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unsigned int contextID = cv->getState()!=0 ? cv->getState()->getContextID() : 0;
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