FGFS-4.1/OpenSceneGraph
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Improved the polytope cutting and project calculation

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This commit is contained in:
Robert Osfield
2007-05-24 14:20:02 +00:00
parent 02b31fdcd9
commit a22a7f867e
1 changed files with 92 additions and 21 deletions
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113
src/osgSim/OverlayNode.cpp
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@@ -15,6 +15,7 @@
#include <osg/Texture2D>
#include <osg/CoordinateSystemNode>
#include <osg/TexEnv>
#include <osg/Geometry>
#include <osg/io_utils>
#include <osgUtil/CullVisitor>
@@ -350,6 +351,8 @@ public:
osg::Vec3d intersection = (vb*distance_a - va*distance_b)/(distance_a-distance_b);
newVertices.push_back(intersection);
newFace.vertices.push_back(intersection);
// osg::notify(osg::NOTICE)<<" intersection distance "<<plane.distance(intersection)<<std::endl;
}
}
@@ -401,6 +404,7 @@ public:
{
osg::Vec3d delta = *vitr - center;
double angle = atan2(delta * u, delta * v);
if (angle<0.0) angle += 2.0*osg::PI;
anglePositions[angle] = *vitr;
}
@@ -456,6 +460,40 @@ public:
}
}
osg::Drawable* createDrawable(const osg::Vec4d& colour)
{
osg::Geometry* geometry = new osg::Geometry;
osg::Vec3Array* vertices = new osg::Vec3Array;
geometry->setVertexArray(vertices);
for(Faces::iterator itr = _faces.begin();
itr != _faces.end();
++itr)
{
Face& face = *itr;
geometry->addPrimitiveSet( new osg::DrawArrays(GL_LINE_STRIP, vertices->size(), face.vertices.size()) );
for(Vertices::iterator vitr = face.vertices.begin();
vitr != face.vertices.end();
++vitr)
{
vertices->push_back(*vitr);
}
}
osg::Vec4Array* colours = new osg::Vec4Array;
colours->push_back(colour);
geometry->setColorArray(colours);
geometry->setColorBinding(osg::Geometry::BIND_OVERALL);
osg::StateSet* stateset = geometry->getOrCreateStateSet();
stateset->setMode(GL_LIGHTING, osg::StateAttribute::OFF);
stateset->setTextureMode(0, GL_TEXTURE_2D, osg::StateAttribute::OFF);
stateset->setTextureMode(1, GL_TEXTURE_2D, osg::StateAttribute::OFF);
return geometry;
}
protected:
typedef std::list<Face> Faces;
@@ -593,6 +631,7 @@ OverlayNode::OverlayData& OverlayNode::getOverlayData(osgUtil::CullVisitor* cv)
texture->setWrap(osg::Texture2D::WRAP_S,osg::Texture2D::CLAMP_TO_BORDER);
texture->setWrap(osg::Texture2D::WRAP_T,osg::Texture2D::CLAMP_TO_BORDER);
texture->setBorderColor(osg::Vec4(_overlayClearColor));
texture->setBorderColor(osg::Vec4(1.0,0.0,0.0,0.5));
overlayData._texture = texture;
}
@@ -860,7 +899,13 @@ void OverlayNode::traverse_VIEW_DEPENDENT_WITH_ORTHOGRAPHIC_OVERLAY(osg::NodeVis
if (_overlaySubgraph.valid())
{
#if 0
if (!overlayData._geode)
{
overlayData._geode = new osg::Geode;
}
#endif
// see if we are within a coordinate system node.
osg::CoordinateSystemNode* csn = 0;
osg::NodePath& nodePath = nv.getNodePath();
@@ -908,7 +953,11 @@ void OverlayNode::traverse_VIEW_DEPENDENT_WITH_ORTHOGRAPHIC_OVERLAY(osg::NodeVis
// create polytope for the view frustum in local coords
CustomPolytope frustum;
frustum.setToUnitFrustum();
#if 1
frustum.setToUnitFrustum(false, false);
#else
frustum.setToUnitFrustum(true, true);
#endif
frustum.transform(inverseMVP, MVP);
@@ -925,29 +974,43 @@ void OverlayNode::traverse_VIEW_DEPENDENT_WITH_ORTHOGRAPHIC_OVERLAY(osg::NodeVis
overlayPolytope.insertVertex(osg::Vec3d(0.0,0.0,0.0));
}
frustum.cut(overlayPolytope);
if (overlayData._geode.valid() && overlayData._geode->getNumDrawables()>500)
{
overlayData._geode->removeDrawables(0, 3);
}
if (overlayData._geode.valid())
{
overlayData._geode->addDrawable(overlayPolytope.createDrawable(osg::Vec4d(1.0f,1.0f,0.0f,1.0f)));
overlayData._geode->addDrawable(frustum.createDrawable(osg::Vec4d(0.0f,0.0f,1.0f,1.0f)));
}
CustomPolytope::Vertices corners;
frustum.getPoints(corners);
#if 0
// frustum.cut(overlayPolytope);
frustum.getPoints(corners);
#else
overlayPolytope.cut(frustum);
overlayPolytope.getPoints(corners);
#endif
if (overlayData._geode.valid())
{
overlayData._geode->addDrawable(overlayPolytope.createDrawable(osg::Vec4d(1.0f,1.0f,1.0f,1.0f)));
}
osg::notify(osg::NOTICE)<<"AFTER CUT corners = "<<corners.size()<<std::endl;
if (corners.size()<8) return;
if (corners.empty()) return;
osg::Vec3d center_near = (corners[0]+corners[1]+corners[2]+corners[3])*0.25;
osg::Vec3d center_far = (corners[4]+corners[5]+corners[6]+corners[7])*0.25;
osg::Vec3d center = (center_near+center_far)*0.5;
osg::Vec3d frustum_axis = (center_far-center_near);
frustum_axis.normalize();
osg::Vec3d center = _overlaySubgraph->getBound().center();
osg::Vec3d frustum_axis = cv->getLookVectorLocal();
double diagonal = (corners[0]-corners[7]).length();
float diagonal_near = (corners[0]-center_near).length();
float diagonal_far = (corners[7]-center_far).length();
osg::notify(osg::NOTICE)<<" center ="<<center<<" diagonal ="<<diagonal<<std::endl;
osg::notify(osg::NOTICE)<<" frustum_axis ="<<frustum_axis<<" diagonal_near ="<<diagonal_near<<" diagonal_far="<<diagonal_far<<std::endl;
osg::Vec3d lookVector(0.0,0.0,-1.0);
if (csn)
@@ -956,7 +1019,8 @@ void OverlayNode::traverse_VIEW_DEPENDENT_WITH_ORTHOGRAPHIC_OVERLAY(osg::NodeVis
lookVector.normalize();
}
osg::Vec3d sideVector = lookVector ^ frustum_axis;
//osg::Vec3d sideVector = lookVector ^ frustum_axis;
osg::Vec3d sideVector = lookVector ^ osg::Vec3d(0.0,0.0,1.0);
sideVector.normalize();
osg::Vec3d upVector = sideVector ^ lookVector;
@@ -986,6 +1050,8 @@ void OverlayNode::traverse_VIEW_DEPENDENT_WITH_ORTHOGRAPHIC_OVERLAY(osg::NodeVis
osg::notify(osg::NOTICE)<<" upVector ="<<upVector<<" min="<<min_side<<" max="<<max_side<<std::endl;
osg::notify(osg::NOTICE)<<" sideVector ="<<sideVector<<" min="<<min_up<<" max="<<max_up<<std::endl;
osg::notify(osg::NOTICE)<<" delta_up = "<<max_up-min_up<<std::endl;
osg::notify(osg::NOTICE)<<" delta_side = "<<max_side-min_side<<std::endl;
double bs_center = (bs.center()-center) * lookVector;
@@ -996,14 +1062,14 @@ void OverlayNode::traverse_VIEW_DEPENDENT_WITH_ORTHOGRAPHIC_OVERLAY(osg::NodeVis
osg::notify(osg::NOTICE)<<" bs.radius()="<<bs.radius()<<std::endl;
#if 1
#if 0
camera->setProjectionMatrixAsOrtho(min_side,max_side,min_up,max_up,bs_near+bs.center().length(),bs_far+bs.center().length());
camera->setViewMatrixAsLookAt(osg::Vec3d(0.0f,0.0f,0.0f), bs.center(), upVector);
#else
camera->setProjectionMatrixAsOrtho(-bs.radius(),bs.radius(),-bs.radius(),bs.radius(),-bs.radius(),bs.radius());
camera->setViewMatrixAsLookAt(bs.center(), osg::Vec3d(0.0f,0.0f,0.0f), osg::Vec3(0.0,0.0,1.0));
camera->setProjectionMatrixAsOrtho(min_side,max_side,min_up,max_up,-bs.radius(),bs.radius());
camera->setViewMatrixAsLookAt(bs.center(), osg::Vec3d(0.0f,0.0f,0.0f), upVector);
#endif
@@ -1033,6 +1099,11 @@ void OverlayNode::traverse_VIEW_DEPENDENT_WITH_ORTHOGRAPHIC_OVERLAY(osg::NodeVis
overlayData._texgenNode->accept(*cv);
if (overlayData._geode.valid())
{
overlayData._geode->accept(*cv);
}
}
else
{