Implemented generation of front, back and bevel geometries to complete the 3d glyphs.
This commit is contained in:
Robert Osfield
parent
5f63f42b12
commit
e4d8e560b0
@ -19,6 +19,7 @@
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#include <osg/ArgumentParser>
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#include <osg/Geode>
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#include <osg/Geometry>
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#include <osg/TriangleIndexFunctor>
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#include <osg/PositionAttitudeTransform>
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#include <osgUtil/SmoothingVisitor>
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#include <osgText/Font3D>
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@ -33,6 +34,72 @@ extern int main_orig(int, char**);
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extern int main_test(int, char**);
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class BevelProfile
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{
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public:
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typedef std::vector<osg::Vec2> Vertices;
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BevelProfile()
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{
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flatBevel();
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}
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void flatBevel(float width=0.25f)
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{
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_vertices.clear();
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if (width>0.5f) width = 0.5f;
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_vertices.push_back(osg::Vec2(0.0f,0.0f));
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_vertices.push_back(osg::Vec2(width,1.0f));
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if (width<0.5f) _vertices.push_back(osg::Vec2(1-width,1.0f));
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_vertices.push_back(osg::Vec2(1.0f,0.0f));
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}
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void roundedBevel(float width=0.5f, unsigned int numSteps=10)
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{
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_vertices.clear();
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if (width>0.5f) width = 0.5f;
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unsigned int i = 0;
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for(; i<=numSteps; ++i)
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{
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float angle = float(osg::PI)*0.5f*(float(i)/float(numSteps));
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_vertices.push_back( osg::Vec2((1.0f-cosf(angle))*width, sinf(angle)) );
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}
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// start the second half one into the curve if the width is half way across
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i = width<0.5f ? 0 : 1;
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for(; i<=numSteps; ++i)
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{
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float angle = float(osg::PI)*0.5f*(float(numSteps-i)/float(numSteps));
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_vertices.push_back( osg::Vec2(1.0-(1.0f-cosf(angle))*width, sin(angle)) );
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}
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}
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void print(std::ostream& fout)
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{
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OSG_NOTICE<<"print bevel"<<std::endl;
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for(Vertices::iterator itr = _vertices.begin();
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itr != _vertices.end();
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++itr)
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{
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OSG_NOTICE<<" "<<*itr<<std::endl;
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}
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}
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Vertices& getVertices() { return _vertices; }
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protected:
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Vertices _vertices;
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};
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class Boundary
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{
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public:
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@ -210,8 +277,6 @@ public:
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osg::Vec3 new_vertex = intersection_abcd + bisector_abcd*(scale_factor*targetThickness);
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// OSG_NOTICE<<"bisector_abcd = "<<bisector_abcd<<", ab_sidevector="<<ab_sidevector<<", b-a="<<b-a<<", scale_factor="<<scale_factor<<std::endl;
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new_vertex.z() += 5.0f;
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return new_vertex;
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}
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@ -335,6 +400,135 @@ osg::Geometry* getGeometryComponent(osg::Geometry* geometry, bool bevel)
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return new_geometry;
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}
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osg::Geometry* computeBevelGeometry(osg::Geometry* geometry, BevelProfile& profile, float width)
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{
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if (!geometry) return 0;
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osg::Vec3Array* orig_vertices = dynamic_cast<osg::Vec3Array*>(geometry->getVertexArray());
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if (!orig_vertices) return 0;
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if (geometry->getNumPrimitiveSets()==0) return 0;
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osg::Geometry* new_geometry = new osg::Geometry;
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osg::Vec3Array* new_vertices = new osg::Vec3Array;
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new_geometry->setVertexArray(new_vertices);
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osg::Vec3 forward(0.0f, 0.0f, -width);
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for(unsigned int prim_i=0; prim_i<geometry->getNumPrimitiveSets(); ++prim_i)
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{
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osg::DrawElementsUShort* bevel = dynamic_cast<osg::DrawElementsUShort*>(geometry->getPrimitiveSet(prim_i));
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if (!bevel) continue;
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unsigned int no_vertices_on_boundary = bevel->size()/2;
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BevelProfile::Vertices& profileVertices = profile.getVertices();
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unsigned int no_vertices_on_bevel = profileVertices.size();
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unsigned int start = new_vertices->size();
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// populate vertices
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for(unsigned int i=0; i<bevel->size()-1;)
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{
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osg::Vec3& top_vertex = (*orig_vertices)[ (*bevel)[i++] ];
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osg::Vec3& base_vertex = (*orig_vertices)[ (*bevel)[i++] ];
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osg::Vec3 up = top_vertex-base_vertex;
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for(unsigned int j=0; j<no_vertices_on_bevel; ++j)
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{
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osg::Vec2& pv = profileVertices[j];
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osg::Vec3 pos( base_vertex + (forward * pv.x()) + (up * pv.y()) );
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new_vertices->push_back(pos);
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}
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}
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osg::DrawElementsUShort* elements = new osg::DrawElementsUShort(GL_TRIANGLES);
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for(unsigned int i = 0; i< no_vertices_on_boundary-1; ++i)
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{
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for(unsigned int j=0; j<no_vertices_on_bevel-1; ++j)
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{
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unsigned int base = start + i*no_vertices_on_bevel + j;
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unsigned int next = base + no_vertices_on_bevel;
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elements->push_back(base);
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elements->push_back(next);
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elements->push_back(base+1);
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elements->push_back(base+1);
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elements->push_back(next);
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elements->push_back(next+1);
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}
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}
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new_geometry->addPrimitiveSet(elements);
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}
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return new_geometry;
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}
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struct CollectTriangleIndicesFunctor
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{
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CollectTriangleIndicesFunctor() {}
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typedef std::vector<unsigned int> Indices;
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Indices _indices;
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void operator() (unsigned int p1, unsigned int p2, unsigned int p3)
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{
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if (p1==p2 || p2==p3 || p1==p3)
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{
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return;
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}
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_indices.push_back(p1);
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_indices.push_back(p3);
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_indices.push_back(p2);
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}
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};
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osg::Geometry* computeFrontAndBackGeometry(osg::Geometry* geometry, float width)
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{
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if (!geometry) return 0;
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osg::Vec3Array* orig_vertices = dynamic_cast<osg::Vec3Array*>(geometry->getVertexArray());
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if (!orig_vertices) return 0;
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if (geometry->getNumPrimitiveSets()==0) return 0;
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osg::TriangleIndexFunctor<CollectTriangleIndicesFunctor> ctif;
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geometry->accept(ctif);
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CollectTriangleIndicesFunctor::Indices& face = ctif._indices;
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osg::Geometry* new_geometry = new osg::Geometry;
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osg::Vec3Array* new_vertices = new osg::Vec3Array;
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new_geometry->setVertexArray(new_vertices);
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osg::Vec3 forward(0.0f, 0.0f, -width);
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// front face
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osg::DrawElementsUShort* front_face = new osg::DrawElementsUShort(GL_TRIANGLES);
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new_geometry->addPrimitiveSet(front_face);
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for(unsigned int i=0; i<face.size();++i)
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{
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osg::Vec3& vertex = (*orig_vertices)[ face[i] ];
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front_face->push_back(new_vertices->size());
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new_vertices->push_back(vertex);
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}
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// back face
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osg::DrawElementsUShort* back_face = new osg::DrawElementsUShort(GL_TRIANGLES);
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new_geometry->addPrimitiveSet(back_face);
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for(unsigned int i=0; i<face.size();++i)
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{
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osg::Vec3 vertex = (*orig_vertices)[ face[face.size()-i-1] ] + forward;
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back_face->push_back(new_vertices->size());
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new_vertices->push_back(vertex);
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}
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return new_geometry;
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}
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osg::Geometry* computeThickness(osg::Geometry* orig_geometry, float thickness)
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{
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@ -399,14 +593,27 @@ int main(int argc, char** argv)
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float thickness = 5.0;
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while(arguments.read("--thickness",thickness)) {}
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float width = 20.0;
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while(arguments.read("--width",width)) {}
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float creaseAngle = 10.0f;
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while(arguments.read("--crease-angle",creaseAngle)) {}
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OSG_NOTICE<<"creaseAngle="<<creaseAngle<<std::endl;
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BevelProfile profile;
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float ratio = 0.5;
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while(arguments.read("--rounded",ratio)) { profile.roundedBevel(ratio); }
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while(arguments.read("--flat",ratio)) { profile.flatBevel(ratio); }
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profile.print(std::cout);
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osg::ref_ptr<osg::Group> group = new osg::Group;
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osg::Vec3 position;
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for(unsigned int i=0; i<word.size(); ++i)
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{
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osg::ref_ptr<osgText::Font3D::Glyph3D> glyph = font->getGlyph(word[i]);
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@ -433,48 +640,36 @@ int main(int argc, char** argv)
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osg::ref_ptr<osg::Geometry> face_and_bevel = computeThickness(geometry, thickness);
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osg::Geometry* bevel = getGeometryComponent(face_and_bevel, true);
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if (bevel)
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osg::ref_ptr<osg::Geometry> face = getGeometryComponent(face_and_bevel, false);
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if (face.valid())
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{
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geode->addDrawable(bevel);
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osgUtil::SmoothingVisitor smoother;
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smoother.setCreaseAngle(osg::DegreesToRadians(creaseAngle));
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geode->accept(smoother);
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osgUtil::Tessellator ts;
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ts.setWindingType(osgUtil::Tessellator::TESS_WINDING_POSITIVE);
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ts.setTessellationType(osgUtil::Tessellator::TESS_TYPE_GEOMETRY);
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ts.retessellatePolygons(*face);
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osg::ref_ptr<osg::Geometry> faces = computeFrontAndBackGeometry(face.get(), width);
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if (faces.valid()) geode->addDrawable(faces.get());
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}
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osg::Geometry* face = getGeometryComponent(face_and_bevel, false);
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if (face) geode->addDrawable(face);
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osg::ref_ptr<osg::Geometry> bevel_strip = getGeometryComponent(face_and_bevel, true);
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osg::ref_ptr<osg::Geometry> bevel = computeBevelGeometry(bevel_strip, profile, width);
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if (useTessellator)
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if (bevel.valid())
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{
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if (geometry)
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{
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osgUtil::Tessellator ts;
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ts.setWindingType(osgUtil::Tessellator::TESS_WINDING_POSITIVE);
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ts.setTessellationType(osgUtil::Tessellator::TESS_TYPE_GEOMETRY);
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ts.retessellatePolygons(*geometry);
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}
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if (face)
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{
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osgUtil::Tessellator ts;
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ts.setWindingType(osgUtil::Tessellator::TESS_WINDING_POSITIVE);
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ts.setTessellationType(osgUtil::Tessellator::TESS_TYPE_GEOMETRY);
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ts.retessellatePolygons(*face);
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}
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geode->addDrawable(bevel.get());
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}
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geode->addDrawable(geometry.get());
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osgUtil::SmoothingVisitor smoother;
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smoother.setCreaseAngle(osg::DegreesToRadians(creaseAngle));
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geode->accept(smoother);
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transform->addChild(geode.get());
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group->addChild(transform.get());
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}
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std::string filename;
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if (arguments.read("-o", filename)) osgDB::writeNodeFile(*group, filename);
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