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Refactored 3d text geometry creation code so that the text is all placed in one osg::Geometry.

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This commit is contained in:
Robert Osfield 2010-08-24 14:22:58 +00:00
parent 7eb172277f
commit f3617062a0
4 changed files with 971 additions and 72 deletions
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5
examples/osgtext3D/CMakeLists.txt
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@ -1,6 +1,11 @@
#this file is automatically generated
SET(TARGET_H
GlyphGeometry.h
)
SET(TARGET_SRC
GlyphGeometry.cpp
osgtext3D_orig.cpp
osgtext3D_test.cpp
osgtext3D.cpp

788
examples/osgtext3D/GlyphGeometry.cpp Normal file
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@ -0,0 +1,788 @@
/* -*-c++-*- OpenSceneGraph - Copyright (C) 1998-2006 Robert Osfield
*
* This library is open source and may be redistributed and/or modified under
* the terms of the OpenSceneGraph Public License (OSGPL) version 0.0 or
* (at your option) any later version. The full license is in LICENSE file
* included with this distribution, and on the openscenegraph.org website.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* OpenSceneGraph Public License for more details.
*/
#include "GlyphGeometry.h"
#include <osg/io_utils>
#include <osg/TriangleIndexFunctor>
#include <osg/LineWidth>
#include <osgUtil/Tessellator>
#include <limits.h>
namespace osgText
{
/////////////////////////////////////////////////////////////////////////////////////////
//
// Boundary
//
class Boundary
{
public:
typedef std::pair<unsigned int, unsigned int> Segment;
typedef std::vector<Segment> Segments;
osg::ref_ptr<osg::Vec3Array> _vertices;
unsigned int _start;
unsigned int _count;
Segments _segments;
Boundary(osg::Vec3Array* vertices, unsigned int start, unsigned int count)
{
_vertices = vertices;
_start = start;
_count = count;
if ((*_vertices)[start]==(*_vertices)[start+count-1])
{
// OSG_NOTICE<<"Boundary is a line loop"<<std::endl;
}
else
{
OSG_NOTICE<<"Boundary is not a line loop"<<std::endl;
}
_segments.reserve(count-1);
for(unsigned int i=start; i<start+count-2; ++i)
{
_segments.push_back(Segment(i,i+1));
}
_segments.push_back(Segment(start+count-2,start));
}
osg::Vec3 computeRayIntersectionPoint(const osg::Vec3& a, const osg::Vec3& an, const osg::Vec3& c, const osg::Vec3& cn)
{
float denominator = ( cn.x() * an.y() - cn.y() * an.x());
if (denominator==0.0f)
{
//OSG_NOTICE<<"computeRayIntersectionPoint()<<denominator==0.0"<<std::endl;
// line segments must be parallel.
return (a+c)*0.5f;
}
float t = ((a.x()-c.x())*an.y() - (a.y()-c.y())*an.x()) / denominator;
return c + cn*t;
}
osg::Vec3 computeIntersectionPoint(const osg::Vec3& a, const osg::Vec3& b, const osg::Vec3& c, const osg::Vec3& d)
{
return computeRayIntersectionPoint(a, b-a, c, d-c);
}
osg::Vec3 computeBisectorNormal(const osg::Vec3& a, const osg::Vec3& b, const osg::Vec3& c, const osg::Vec3& d)
{
osg::Vec2 ab(a.x()-b.x(), a.y()-b.y());
osg::Vec2 dc(d.x()-c.x(), d.y()-c.y());
/*float length_ab =*/ ab.normalize();
/*float length_dc =*/ dc.normalize();
float e = dc.y() - ab.y();
float f = ab.x() - dc.x();
float denominator = sqrtf(e*e + f*f);
float nx = e / denominator;
float ny = f / denominator;
if (( ab.x()*ny - ab.y()*nx) > 0.0f)
{
// OSG_NOTICE<<" computeBisectorNormal(a=["<<a<<"], b=["<<b<<"], c=["<<c<<"], d=["<<d<<"]), nx="<<nx<<", ny="<<ny<<", denominator="<<denominator<<" no need to swap"<<std::endl;
return osg::Vec3(nx,ny,0.0f);
}
else
{
OSG_NOTICE<<" computeBisectorNormal(a=["<<a<<"], b=["<<b<<"], c=["<<c<<"], d=["<<d<<"]), nx="<<nx<<", ny="<<ny<<", denominator="<<denominator<<" need to swap!!!"<<std::endl;
return osg::Vec3(-nx,-ny,0.0f);
}
}
float computeBisectorIntersectorThickness(const osg::Vec3& a, const osg::Vec3& b, const osg::Vec3& c, const osg::Vec3& d, const osg::Vec3& e, const osg::Vec3& f)
{
osg::Vec3 intersection_abcd = computeIntersectionPoint(a,b,c,d);
osg::Vec3 bisector_abcd = computeBisectorNormal(a,b,c,d);
osg::Vec3 intersection_cdef = computeIntersectionPoint(c,d,e,f);
osg::Vec3 bisector_cdef = computeBisectorNormal(c,d,e,f);
if (bisector_abcd==bisector_cdef)
{
//OSG_NOTICE<<"computeBisectorIntersector(["<<a<<"], ["<<b<<"], ["<<c<<"], ["<<d<<"], ["<<e<<"], ["<<f<<"[)"<<std::endl;
//OSG_NOTICE<<" bisectors parallel, thickness = "<<FLT_MAX<<std::endl;
return FLT_MAX;
}
osg::Vec3 bisector_intersection = computeRayIntersectionPoint(intersection_abcd,bisector_abcd, intersection_cdef, bisector_cdef);
osg::Vec3 normal(d.y()-c.y(), c.x()-d.x(), 0.0);
float cd_length = normal.normalize();
if (cd_length==0)
{
//OSG_NOTICE<<"computeBisectorIntersector(["<<a<<"], ["<<b<<"], ["<<c<<"], ["<<d<<"], ["<<e<<"], ["<<f<<"[)"<<std::endl;
//OSG_NOTICE<<" segment length==0, thickness = "<<FLT_MAX<<std::endl;
return FLT_MAX;
}
float thickness = (bisector_intersection - c) * normal;
#if 0
OSG_NOTICE<<"computeBisectorIntersector(["<<a<<"], ["<<b<<"], ["<<c<<"], ["<<d<<"], ["<<e<<"], ["<<f<<"[)"<<std::endl;
OSG_NOTICE<<" bisector_abcd = "<<bisector_abcd<<", bisector_cdef="<<bisector_cdef<<std::endl;
OSG_NOTICE<<" bisector_intersection = "<<bisector_intersection<<", thickness = "<<thickness<<std::endl;
#endif
return thickness;
}
float computeThickness(unsigned int i)
{
Segment& seg_before = _segments[ (i+_segments.size()-1) % _segments.size() ];
Segment& seg_target = _segments[ (i) % _segments.size() ];
Segment& seg_after = _segments[ (i+1) % _segments.size() ];
return computeBisectorIntersectorThickness(
(*_vertices)[seg_before.first], (*_vertices)[seg_before.second],
(*_vertices)[seg_target.first], (*_vertices)[seg_target.second],
(*_vertices)[seg_after.first], (*_vertices)[seg_after.second]);
}
void computeAllThickness()
{
for(unsigned int i=0; i<_segments.size(); ++i)
{
computeThickness(i);
}
}
bool findMinThickness(unsigned int& minThickness_i, float& minThickness)
{
minThickness_i = _segments.size();
for(unsigned int i=0; i<_segments.size(); ++i)
{
float thickness = computeThickness(i);
if (thickness>0.0 && thickness < minThickness)
{
minThickness = thickness;
minThickness_i = i;
}
}
return minThickness_i != _segments.size();
}
void removeAllSegmentsBelowThickness(float targetThickness)
{
// OSG_NOTICE<<"removeAllSegmentsBelowThickness("<<targetThickness<<")"<<std::endl;
for(;;)
{
unsigned int minThickness_i = _segments.size();
float minThickness = targetThickness;
if (!findMinThickness(minThickness_i,minThickness)) break;
// OSG_NOTICE<<" removing segment _segments["<<minThickness_i<<"] ("<<_segments[minThickness_i].first<<", "<<_segments[minThickness_i].second<<" with thickness="<<minThickness<<" "<<std::endl;
_segments.erase(_segments.begin()+minThickness_i);
}
}
bool findMaxThickness(unsigned int& maxThickness_i, float& maxThickness)
{
maxThickness_i = _segments.size();
for(unsigned int i=0; i<_segments.size(); ++i)
{
float thickness = computeThickness(i);
if (thickness<0.0 && thickness > maxThickness)
{
maxThickness = thickness;
maxThickness_i = i;
}
}
return maxThickness_i != _segments.size();
}
void removeAllSegmentsAboveThickness(float targetThickness)
{
// OSG_NOTICE<<"removeAllSegmentsBelowThickness("<<targetThickness<<")"<<std::endl;
for(;;)
{
unsigned int maxThickness_i = _segments.size();
float maxThickness = targetThickness;
if (!findMaxThickness(maxThickness_i,maxThickness)) break;
// OSG_NOTICE<<" removing segment _segments["<<minThickness_i<<"] ("<<_segments[minThickness_i].first<<", "<<_segments[minThickness_i].second<<" with thickness="<<minThickness<<" "<<std::endl;
_segments.erase(_segments.begin()+maxThickness_i);
}
}
osg::Vec3 computeBisectorPoint(unsigned int i, float targetThickness)
{
Segment& seg_before = _segments[ (i+_segments.size()-1) % _segments.size() ];
Segment& seg_target = _segments[ (i) % _segments.size() ];
osg::Vec3& a = (*_vertices)[seg_before.first];
osg::Vec3& b = (*_vertices)[seg_before.second];
osg::Vec3& c = (*_vertices)[seg_target.first];
osg::Vec3& d = (*_vertices)[seg_target.second];
osg::Vec3 intersection_abcd = computeIntersectionPoint(a,b,c,d);
osg::Vec3 bisector_abcd = computeBisectorNormal(a,b,c,d);
osg::Vec3 ab_sidevector(b.y()-a.y(), a.x()-b.x(), 0.0);
ab_sidevector.normalize();
float scale_factor = 1.0/ (bisector_abcd*ab_sidevector);
osg::Vec3 new_vertex = intersection_abcd + bisector_abcd*(scale_factor*targetThickness);
// OSG_NOTICE<<"bisector_abcd = "<<bisector_abcd<<", ab_sidevector="<<ab_sidevector<<", b-a="<<b-a<<", scale_factor="<<scale_factor<<std::endl;
return new_vertex;
}
void addBoundaryToGeometry(osg::Geometry* geometry, float targetThickness, bool requireFace)
{
if (_segments.empty()) return;
if (geometry->getVertexArray()==0) geometry->setVertexArray(new osg::Vec3Array);
osg::Vec3Array* new_vertices = dynamic_cast<osg::Vec3Array*>(geometry->getVertexArray());
// allocate the primitive set to store the face geometry
osg::ref_ptr<osg::DrawElementsUShort> face = new osg::DrawElementsUShort(GL_POLYGON);
face->setName("face");
// reserve enough space in the vertex array to accomodate the vertices associated with the segments
new_vertices->reserve(new_vertices->size() + _segments.size()+1 + _count);
// create vertices
unsigned int previous_second = _segments[0].second;
osg::Vec3 newPoint = computeBisectorPoint(0, targetThickness);
unsigned int first = new_vertices->size();
new_vertices->push_back(newPoint);
if (_segments[0].first != _start)
{
//OSG_NOTICE<<"We have pruned from the start"<<std::endl;
for(unsigned int j=_start; j<=_segments[0].first;++j)
{
face->push_back(first);
}
}
else
{
face->push_back(first);
}
for(unsigned int i=1; i<_segments.size(); ++i)
{
newPoint = computeBisectorPoint(i, targetThickness);
unsigned int vi = new_vertices->size();
new_vertices->push_back(newPoint);
if (previous_second != _segments[i].first)
{
//OSG_NOTICE<<"Gap in boundary"<<previous_second<<" to "<<_segments[i].first<<std::endl;
for(unsigned int j=previous_second; j<=_segments[i].first;++j)
{
face->push_back(vi);
}
}
else
{
face->push_back(vi);
}
previous_second = _segments[i].second;
}
// fill the end of the polygon with repititions of the first index in the polygon to ensure
// that the orignal and new boundary polygons have the same number and pairing of indices.
// This ensures that the bevel can be created coherently.
while(face->size() < _count)
{
face->push_back(first);
}
if (requireFace)
{
// add face primitive set for polygon
geometry->addPrimitiveSet(face.get());
}
osg::DrawElementsUShort* bevel = new osg::DrawElementsUShort(GL_QUAD_STRIP);
bevel->setName("bevel");
bevel->reserve(_count*2);
for(unsigned int i=0; i<_count; ++i)
{
unsigned int vi = new_vertices->size();
new_vertices->push_back((*_vertices)[_start+i]);
bevel->push_back(vi);
bevel->push_back((*face)[i]);
}
geometry->addPrimitiveSet(bevel);
}
void newAddBoundaryToGeometry(osg::Geometry* geometry, float targetThickness, const std::string& faceName, const std::string& bevelName)
{
if (_segments.empty()) return;
if (geometry->getVertexArray()==0) geometry->setVertexArray(new osg::Vec3Array(*_vertices));
osg::Vec3Array* new_vertices = dynamic_cast<osg::Vec3Array*>(geometry->getVertexArray());
// allocate the primitive set to store the face geometry
osg::ref_ptr<osg::DrawElementsUShort> face = new osg::DrawElementsUShort(GL_POLYGON);
face->setName(faceName);
// reserve enough space in the vertex array to accomodate the vertices associated with the segments
new_vertices->reserve(new_vertices->size() + _segments.size()+1 + _count);
// create vertices
unsigned int previous_second = _segments[0].second;
osg::Vec3 newPoint = computeBisectorPoint(0, targetThickness);
unsigned int first = new_vertices->size();
new_vertices->push_back(newPoint);
if (_segments[0].first != _start)
{
//OSG_NOTICE<<"We have pruned from the start"<<std::endl;
for(unsigned int j=_start; j<=_segments[0].first;++j)
{
face->push_back(first);
}
}
else
{
face->push_back(first);
}
for(unsigned int i=1; i<_segments.size(); ++i)
{
newPoint = computeBisectorPoint(i, targetThickness);
unsigned int vi = new_vertices->size();
new_vertices->push_back(newPoint);
if (previous_second != _segments[i].first)
{
//OSG_NOTICE<<"Gap in boundary"<<previous_second<<" to "<<_segments[i].first<<std::endl;
for(unsigned int j=previous_second; j<=_segments[i].first;++j)
{
face->push_back(vi);
}
}
else
{
face->push_back(vi);
}
previous_second = _segments[i].second;
}
// fill the end of the polygon with repititions of the first index in the polygon to ensure
// that the orignal and new boundary polygons have the same number and pairing of indices.
// This ensures that the bevel can be created coherently.
while(face->size() < _count)
{
face->push_back(first);
}
if (!faceName.empty())
{
// add face primitive set for polygon
geometry->addPrimitiveSet(face.get());
}
osg::DrawElementsUShort* bevel = new osg::DrawElementsUShort(GL_QUAD_STRIP);
bevel->setName(bevelName);
bevel->reserve(_count*2);
for(unsigned int i=0; i<_count; ++i)
{
bevel->push_back(_start+i);
bevel->push_back((*face)[i]);
}
geometry->addPrimitiveSet(bevel);
}
};
/////////////////////////////////////////////////////////////////////////////////////////
//
// BevelProfile
//
BevelProfile::BevelProfile()
{
flatBevel();
}
void BevelProfile::flatBevel(float width)
{
_vertices.clear();
if (width>0.5f) width = 0.5f;
_vertices.push_back(osg::Vec2(0.0f,0.0f));
_vertices.push_back(osg::Vec2(width,1.0f));
if (width<0.5f) _vertices.push_back(osg::Vec2(1-width,1.0f));
_vertices.push_back(osg::Vec2(1.0f,0.0f));
}
void BevelProfile::roundedBevel(float width, unsigned int numSteps)
{
_vertices.clear();
if (width>0.5f) width = 0.5f;
unsigned int i = 0;
for(; i<=numSteps; ++i)
{
float angle = float(osg::PI)*0.5f*(float(i)/float(numSteps));
_vertices.push_back( osg::Vec2((1.0f-cosf(angle))*width, sinf(angle)) );
}
// start the second half one into the curve if the width is half way across
i = width<0.5f ? 0 : 1;
for(; i<=numSteps; ++i)
{
float angle = float(osg::PI)*0.5f*(float(numSteps-i)/float(numSteps));
_vertices.push_back( osg::Vec2(1.0-(1.0f-cosf(angle))*width, sin(angle)) );
}
}
void BevelProfile::roundedBevel2(float width, unsigned int numSteps)
{
_vertices.clear();
if (width>0.5f) width = 0.5f;
float h = 0.1f;
float r = 1.0f-h;
_vertices.push_back(osg::Vec2(0.0,0.0));
unsigned int i = 0;
for(; i<=numSteps; ++i)
{
float angle = float(osg::PI)*0.5f*(float(i)/float(numSteps));
_vertices.push_back( osg::Vec2((1.0f-cosf(angle))*width, h + sinf(angle)*r) );
}
// start the second half one into the curve if the width is half way across
i = width<0.5f ? 0 : 1;
for(; i<=numSteps; ++i)
{
float angle = float(osg::PI)*0.5f*(float(numSteps-i)/float(numSteps));
_vertices.push_back( osg::Vec2(1.0-(1.0f-cosf(angle))*width, h + sin(angle)*r) );
}
_vertices.push_back(osg::Vec2(1.0,0.0));
}
void BevelProfile::print(std::ostream& fout)
{
OSG_NOTICE<<"print bevel"<<std::endl;
for(Vertices::iterator itr = _vertices.begin();
itr != _vertices.end();
++itr)
{
OSG_NOTICE<<" "<<*itr<<std::endl;
}
}
/////////////////////////////////////////////////////////////////////////////////////////
//
// computeGlyphGeometry
//
struct CollectTriangleIndicesFunctor
{
CollectTriangleIndicesFunctor() {}
typedef std::vector<unsigned int> Indices;
Indices _indices;
void operator() (unsigned int p1, unsigned int p2, unsigned int p3)
{
if (p1==p2 || p2==p3 || p1==p3)
{
return;
}
_indices.push_back(p1);
_indices.push_back(p3);
_indices.push_back(p2);
}
};
osg::Geometry* computeGlyphGeometry(osgText::Font3D::Glyph3D* glyph, float bevelThickness, float shellThickness)
{
osg::Vec3Array* orig_vertices = glyph->getRawVertexArray();
osg::Geometry::PrimitiveSetList& orig_primitives = glyph->getRawFacePrimitiveSetList();
osg::ref_ptr<osg::Geometry> new_geometry = new osg::Geometry;
for(osg::Geometry::PrimitiveSetList::iterator itr = orig_primitives.begin();
itr != orig_primitives.end();
++itr)
{
osg::DrawArrays* drawArray = dynamic_cast<osg::DrawArrays*>(itr->get());
if (drawArray && drawArray->getMode()==GL_POLYGON)
{
Boundary boundaryInner(orig_vertices, drawArray->getFirst(), drawArray->getCount());
boundaryInner.removeAllSegmentsBelowThickness(bevelThickness);
boundaryInner.newAddBoundaryToGeometry(new_geometry, bevelThickness, "face", "bevel");
Boundary boundaryOuter(orig_vertices, drawArray->getFirst(), drawArray->getCount());
boundaryOuter.removeAllSegmentsAboveThickness(-shellThickness);
boundaryOuter.newAddBoundaryToGeometry(new_geometry, -shellThickness, "", "shell");
}
}
osg::Vec3Array* vertices = dynamic_cast<osg::Vec3Array*>(new_geometry->getVertexArray());
// need to tessellate the inner boundary
{
osg::Geometry* face_geometry = new osg::Geometry;
face_geometry->setVertexArray(vertices);
osg::CopyOp copyop(osg::CopyOp::DEEP_COPY_ALL);
osg::Geometry::PrimitiveSetList primitiveSets;
for(osg::Geometry::PrimitiveSetList::iterator itr = new_geometry->getPrimitiveSetList().begin();
itr != new_geometry->getPrimitiveSetList().end();
++itr)
{
osg::PrimitiveSet* prim = itr->get();
if (prim->getName()=="face") face_geometry->addPrimitiveSet(copyop(*itr));
else primitiveSets.push_back(prim);
}
osgUtil::Tessellator ts;
ts.setWindingType(osgUtil::Tessellator::TESS_WINDING_POSITIVE);
ts.setTessellationType(osgUtil::Tessellator::TESS_TYPE_GEOMETRY);
ts.retessellatePolygons(*face_geometry);
osg::TriangleIndexFunctor<CollectTriangleIndicesFunctor> ctif;
face_geometry->accept(ctif);
CollectTriangleIndicesFunctor::Indices& indices = ctif._indices;
// remove the previous primitive sets
new_geometry->getPrimitiveSetList().clear();
// create a front face using triangle indices
osg::DrawElementsUShort* front_face = new osg::DrawElementsUShort(GL_TRIANGLES);
front_face->setName("face");
new_geometry->addPrimitiveSet(front_face);
for(unsigned int i=0; i<indices.size();++i)
{
front_face->push_back(indices[i]);
}
for(osg::Geometry::PrimitiveSetList::iterator itr = primitiveSets.begin();
itr != primitiveSets.end();
++itr)
{
osg::PrimitiveSet* prim = itr->get();
if (prim->getName()!="face") new_geometry->addPrimitiveSet(prim);
}
}
return new_geometry.release();
}
/////////////////////////////////////////////////////////////////////////////////////////
//
// computeTextGeometry
//
osg::Geometry* computeTextGeometry(osg::Geometry* glyphGeometry, BevelProfile& profile, float width)
{
osg::Vec3Array* orig_vertices = dynamic_cast<osg::Vec3Array*>(glyphGeometry->getVertexArray());
if (!orig_vertices)
{
OSG_NOTICE<<"computeTextGeometry(..): No vertices on glyphGeometry."<<std::endl;
return 0;
}
osg::ref_ptr<osg::Geometry> text_geometry = new osg::Geometry;
osg::ref_ptr<osg::Vec3Array> vertices = new osg::Vec3Array;
text_geometry->setVertexArray(vertices.get());
typedef std::vector<unsigned int> Indices;
const unsigned int NULL_VALUE = UINT_MAX;
Indices front_indices, back_indices;
front_indices.resize(orig_vertices->size(), NULL_VALUE);
back_indices.resize(orig_vertices->size(), NULL_VALUE);
osg::DrawElementsUShort* face = 0;
osg::Geometry::PrimitiveSetList bevelPrimitiveSets;
osg::Vec3 forward(0,0,-width);
// collect bevels and face primitive sets
for(osg::Geometry::PrimitiveSetList::iterator itr = glyphGeometry->getPrimitiveSetList().begin();
itr != glyphGeometry->getPrimitiveSetList().end();
++itr)
{
osg::PrimitiveSet* prim = itr->get();
if (prim->getName()=="face") face = dynamic_cast<osg::DrawElementsUShort*>(prim);
else if (prim->getName()=="bevel") bevelPrimitiveSets.push_back(prim);
}
// if we don't have a face we can't create any 3d text
if (!face) return 0;
// build up the vertices primitives for the front face, and record the indices
// for later use, and to ensure sharing of vertices in the face primitive set
osg::DrawElementsUShort* frontFace = new osg::DrawElementsUShort(GL_TRIANGLES);
text_geometry->addPrimitiveSet(frontFace);
for(unsigned int i=0; i<face->size();)
{
unsigned int pi = (*face)[i++];
if (front_indices[pi]==NULL_VALUE)
{
front_indices[pi] = vertices->size();
vertices->push_back((*orig_vertices)[pi]);
}
frontFace->push_back(front_indices[pi]);
}
// build up the vertices primitives for the back face, and record the indices
// for later use, and to ensure sharing of vertices in the face primitive set
// the order of the triangle indices are flipped to make sure that the triangles are back face
osg::DrawElementsUShort* backFace = new osg::DrawElementsUShort(GL_TRIANGLES);
text_geometry->addPrimitiveSet(backFace);
for(unsigned int i=0; i<face->size()-2;)
{
unsigned int p1 = (*face)[i++];
unsigned int p2 = (*face)[i++];
unsigned int p3 = (*face)[i++];
if (back_indices[p1]==NULL_VALUE)
{
back_indices[p1] = vertices->size();
vertices->push_back((*orig_vertices)[p1]+forward);
}
if (back_indices[p2]==NULL_VALUE)
{
back_indices[p2] = vertices->size();
vertices->push_back((*orig_vertices)[p2]+forward);
}
if (back_indices[p3]==NULL_VALUE)
{
back_indices[p3] = vertices->size();
vertices->push_back((*orig_vertices)[p3]+forward);
}
backFace->push_back(back_indices[p1]);
backFace->push_back(back_indices[p3]);
backFace->push_back(back_indices[p2]);
}
bool shareVerticesWithFaces = true;
// now build up the bevel
for(osg::Geometry::PrimitiveSetList::iterator itr = bevelPrimitiveSets.begin();
itr != bevelPrimitiveSets.end();
++itr)
{
osg::DrawElementsUShort* bevel = dynamic_cast<osg::DrawElementsUShort*>(itr->get());
if (!bevel) continue;
unsigned int no_vertices_on_boundary = bevel->size()/2;
osgText::BevelProfile::Vertices& profileVertices = profile.getVertices();
unsigned int no_vertices_on_bevel = profileVertices.size();
Indices bevelIndices;
bevelIndices.resize(no_vertices_on_boundary*no_vertices_on_bevel, NULL_VALUE);
// populate vertices
for(unsigned int i=0; i<no_vertices_on_boundary; ++i)
{
unsigned int topi = (*bevel)[i*2];
unsigned int basei = (*bevel)[i*2+1];
osg::Vec3& top_vertex = (*orig_vertices)[ topi ];
osg::Vec3& base_vertex = (*orig_vertices)[ basei ];
osg::Vec3 up = top_vertex-base_vertex;
if (shareVerticesWithFaces)
{
if (front_indices[basei]==NULL_VALUE)
{
front_indices[basei] = vertices->size();
vertices->push_back(base_vertex);
}
bevelIndices[i*no_vertices_on_bevel + 0] = front_indices[basei];
for(unsigned int j=1; j<no_vertices_on_bevel-1; ++j)
{
const osg::Vec2& pv = profileVertices[j];
osg::Vec3 pos( base_vertex + (forward * pv.x()) + (up * pv.y()) );
bevelIndices[i*no_vertices_on_bevel + j] = vertices->size();
vertices->push_back(pos);
}
if (back_indices[basei]==NULL_VALUE)
{
back_indices[basei] = vertices->size();
vertices->push_back(base_vertex + forward);
}
bevelIndices[i*no_vertices_on_bevel + no_vertices_on_bevel-1] = back_indices[basei];
}
else
{
for(unsigned int j=0; j<no_vertices_on_bevel; ++j)
{
const osg::Vec2& pv = profileVertices[j];
osg::Vec3 pos( base_vertex + (forward * pv.x()) + (up * pv.y()) );
bevelIndices[i*no_vertices_on_bevel + j] = vertices->size();
vertices->push_back(pos);
}
}
}
osg::DrawElementsUShort* elements = new osg::DrawElementsUShort(GL_TRIANGLES);
unsigned int base, next;
for(unsigned int i = 0; i< no_vertices_on_boundary-1; ++i)
{
for(unsigned int j=0; j<no_vertices_on_bevel-1; ++j)
{
base = i*no_vertices_on_bevel + j;
next = base + no_vertices_on_bevel;
elements->push_back(bevelIndices[base]);
elements->push_back(bevelIndices[next]);
elements->push_back(bevelIndices[base+1]);
elements->push_back(bevelIndices[base+1]);
elements->push_back(bevelIndices[next]);
elements->push_back(bevelIndices[next+1]);
}
}
text_geometry->addPrimitiveSet(elements);
}
return text_geometry.release();
}
/////////////////////////////////////////////////////////////////////////////////////////
//
// computeShellGeometry
//
osg::Geometry* computeShellGeometry(osg::Geometry* glyphGeometry, BevelProfile& profile, float width)
{
return 0;
}
}

53
examples/osgtext3D/GlyphGeometry.h Normal file
View File

@ -0,0 +1,53 @@
/* -*-c++-*- OpenSceneGraph - Copyright (C) 1998-2006 Robert Osfield
*
* This library is open source and may be redistributed and/or modified under
* the terms of the OpenSceneGraph Public License (OSGPL) version 0.0 or
* (at your option) any later version. The full license is in LICENSE file
* included with this distribution, and on the openscenegraph.org website.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* OpenSceneGraph Public License for more details.
*/
#ifndef OSGTEXT_GLYPHGEOMETRY
#define OSGTEXT_GLYPHGEOMETRY 1
#include <osgText/Font3D>
namespace osgText
{
class BevelProfile
{
public:
typedef std::vector<osg::Vec2> Vertices;
BevelProfile();
void flatBevel(float width=0.25f);
void roundedBevel(float width=0.5f, unsigned int numSteps=10);
void roundedBevel2(float width=0.5f, unsigned int numSteps=10);
void print(std::ostream& fout);
Vertices& getVertices() { return _vertices; }
protected:
Vertices _vertices;
};
extern osg::Geometry* computeGlyphGeometry(osgText::Font3D::Glyph3D* glyph, float bevelThickness, float shellThickness);
extern osg::Geometry* computeTextGeometry(osg::Geometry* glyphGeometry, BevelProfile& profile, float width);
extern osg::Geometry* computeShellGeometry(osg::Geometry* glyphGeometry, BevelProfile& profile, float width);
}
#endif

197
examples/osgtext3D/osgtext3D.cpp
View File

@ -19,6 +19,7 @@
#include <osg/ArgumentParser>
#include <osg/Geode>
#include <osg/Geometry>
#include <osg/CullFace>
#include <osg/TriangleIndexFunctor>
#include <osg/PositionAttitudeTransform>
#include <osgUtil/SmoothingVisitor>
@ -30,75 +31,12 @@
#include <osgViewer/ViewerEventHandlers>
#include <osg/io_utils>
#include "GlyphGeometry.h"
extern int main_orig(int, char**);
extern int main_test(int, char**);
class BevelProfile
{
public:
typedef std::vector<osg::Vec2> Vertices;
BevelProfile()
{
flatBevel();
}
void flatBevel(float width=0.25f)
{
_vertices.clear();
if (width>0.5f) width = 0.5f;
_vertices.push_back(osg::Vec2(0.0f,0.0f));
_vertices.push_back(osg::Vec2(width,1.0f));
if (width<0.5f) _vertices.push_back(osg::Vec2(1-width,1.0f));
_vertices.push_back(osg::Vec2(1.0f,0.0f));
}
void roundedBevel(float width=0.5f, unsigned int numSteps=10)
{
_vertices.clear();
if (width>0.5f) width = 0.5f;
unsigned int i = 0;
for(; i<=numSteps; ++i)
{
float angle = float(osg::PI)*0.5f*(float(i)/float(numSteps));
_vertices.push_back( osg::Vec2((1.0f-cosf(angle))*width, sinf(angle)) );
}
// start the second half one into the curve if the width is half way across
i = width<0.5f ? 0 : 1;
for(; i<=numSteps; ++i)
{
float angle = float(osg::PI)*0.5f*(float(numSteps-i)/float(numSteps));
_vertices.push_back( osg::Vec2(1.0-(1.0f-cosf(angle))*width, sin(angle)) );
}
}
void print(std::ostream& fout)
{
OSG_NOTICE<<"print bevel"<<std::endl;
for(Vertices::iterator itr = _vertices.begin();
itr != _vertices.end();
++itr)
{
OSG_NOTICE<<" "<<*itr<<std::endl;
}
}
Vertices& getVertices() { return _vertices; }
protected:
Vertices _vertices;
};
class Boundary
{
@ -261,6 +199,37 @@ public:
}
}
bool findMaxThickness(unsigned int& maxThickness_i, float& maxThickness)
{
maxThickness_i = _segments.size();
for(unsigned int i=0; i<_segments.size(); ++i)
{
float thickness = computeThickness(i);
if (thickness<0.0 && thickness > maxThickness)
{
maxThickness = thickness;
maxThickness_i = i;
}
}
return maxThickness_i != _segments.size();
}
void removeAllSegmentsAboveThickness(float targetThickness)
{
// OSG_NOTICE<<"removeAllSegmentsBelowThickness("<<targetThickness<<")"<<std::endl;
for(;;)
{
unsigned int maxThickness_i = _segments.size();
float maxThickness = targetThickness;
if (!findMaxThickness(maxThickness_i,maxThickness)) break;
// OSG_NOTICE<<" removing segment _segments["<<minThickness_i<<"] ("<<_segments[minThickness_i].first<<", "<<_segments[minThickness_i].second<<" with thickness="<<minThickness<<" "<<std::endl;
_segments.erase(_segments.begin()+maxThickness_i);
}
}
osg::Vec3 computeBisectorPoint(unsigned int i, float targetThickness)
{
Segment& seg_before = _segments[ (i+_segments.size()-1) % _segments.size() ];
@ -400,7 +369,7 @@ osg::Geometry* getGeometryComponent(osg::Geometry* geometry, bool bevel)
return new_geometry;
}
osg::Geometry* computeBevelGeometry(osg::Geometry* geometry, BevelProfile& profile, float width)
osg::Geometry* computeBevelGeometry(osg::Geometry* geometry, osgText::BevelProfile& profile, float width)
{
if (!geometry) return 0;
@ -423,7 +392,7 @@ osg::Geometry* computeBevelGeometry(osg::Geometry* geometry, BevelProfile& profi
unsigned int no_vertices_on_boundary = bevel->size()/2;
BevelProfile::Vertices& profileVertices = profile.getVertices();
osgText::BevelProfile::Vertices& profileVertices = profile.getVertices();
unsigned int no_vertices_on_bevel = profileVertices.size();
unsigned int start = new_vertices->size();
@ -530,6 +499,54 @@ osg::Geometry* computeFrontAndBackGeometry(osg::Geometry* geometry, float width)
return new_geometry;
}
osg::Geometry* createShell(osg::Geometry* geometry, float distance)
{
if (!geometry) return 0;
osg::Vec3Array* orig_vertices = dynamic_cast<osg::Vec3Array*>(geometry->getVertexArray());
if (!orig_vertices) return 0;
osg::Vec3Array* orig_normals = dynamic_cast<osg::Vec3Array*>(geometry->getNormalArray());
if (!orig_normals) return 0;
if (orig_vertices->size() != orig_normals->size()) return 0;
osg::Geometry* new_geometry = new osg::Geometry;
osg::Vec3Array* new_vertices = new osg::Vec3Array(orig_vertices->size());
for(unsigned int i=0; i<orig_vertices->size(); ++i)
{
(*new_vertices)[i] = (*orig_vertices)[i] + (*orig_normals)[i]*distance;
}
new_geometry->setVertexArray(new_vertices);
osg::Vec4Array* new_colours = new osg::Vec4Array;
new_colours->push_back(osg::Vec4(1.0,1.0,1.0,0.2));
new_geometry->setColorArray(new_colours);
new_geometry->setColorBinding(osg::Geometry::BIND_OVERALL);
osg::TriangleIndexFunctor<CollectTriangleIndicesFunctor> ctif;
geometry->accept(ctif);
// front face
osg::DrawElementsUInt* shell = new osg::DrawElementsUInt(GL_TRIANGLES);
new_geometry->addPrimitiveSet(shell);
CollectTriangleIndicesFunctor::Indices& face = ctif._indices;
for(unsigned int i=0; i<face.size();++i)
{
shell->push_back(face[i]);
}
osg::StateSet* stateset = new_geometry->getOrCreateStateSet();
stateset->setMode(GL_BLEND, osg::StateAttribute::ON);
stateset->setMode(GL_LIGHTING, osg::StateAttribute::OFF);
stateset->setAttributeAndModes(new osg::CullFace, osg::StateAttribute::ON);
stateset->setRenderingHint(osg::StateSet::TRANSPARENT_BIN);
return new_geometry;
}
osg::Geometry* computeThickness(osg::Geometry* orig_geometry, float thickness)
{
// OSG_NOTICE<<"computeThickness("<<orig_geometry<<")"<<std::endl;
@ -546,7 +563,8 @@ osg::Geometry* computeThickness(osg::Geometry* orig_geometry, float thickness)
if (drawArray && drawArray->getMode()==GL_POLYGON)
{
Boundary boundary(orig_vertices, drawArray->getFirst(), drawArray->getCount());
boundary.removeAllSegmentsBelowThickness(thickness);
if (thickness>0.0f) boundary.removeAllSegmentsBelowThickness(thickness);
else if (thickness<0.0f) boundary.removeAllSegmentsAboveThickness(thickness);
boundary.addBoundaryToGeometry(new_geometry, thickness);
}
}
@ -601,9 +619,10 @@ int main(int argc, char** argv)
OSG_NOTICE<<"creaseAngle="<<creaseAngle<<std::endl;
BevelProfile profile;
osgText::BevelProfile profile;
float ratio = 0.5;
while(arguments.read("--rounded",ratio)) { profile.roundedBevel(ratio); }
while(arguments.read("--rounded2",ratio)) { profile.roundedBevel2(ratio); }
while(arguments.read("--flat",ratio)) { profile.flatBevel(ratio); }
profile.print(std::cout);
@ -627,6 +646,24 @@ int main(int argc, char** argv)
osg::ref_ptr<osg::Geode> geode = new osg::Geode;
#if 1
osg::ref_ptr<osg::Geometry> glyphGeometry = osgText::computeGlyphGeometry(glyph.get(), thickness, width);
osg::ref_ptr<osg::Geometry> textGeometry = osgText::computeTextGeometry(glyphGeometry.get(), profile, width);
osg::ref_ptr<osg::Geometry> shellGeometry = osgText::computeShellGeometry(glyphGeometry.get(), profile, width);
if (textGeometry.valid())
{
geode->addDrawable(textGeometry.get());
// create the normals
if (true)
{
osgUtil::SmoothingVisitor smoother;
smoother.setCreaseAngle(osg::DegreesToRadians(creaseAngle));
geode->accept(smoother);
}
}
if (shellGeometry.valid()) geode->addDrawable(shellGeometry.get());
#else
osg::Vec3Array* vertices = glyph->getRawVertexArray();
osg::Geometry::PrimitiveSetList& primitives = glyph->getRawFacePrimitiveSetList();
@ -661,9 +698,25 @@ int main(int argc, char** argv)
geode->addDrawable(bevel.get());
}
osgUtil::SmoothingVisitor smoother;
smoother.setCreaseAngle(osg::DegreesToRadians(creaseAngle));
geode->accept(smoother);
// create the normals
{
osgUtil::SmoothingVisitor smoother;
geode->accept(smoother);
}
osg::ref_ptr<osg::Geometry> shell = createShell(bevel.get(), width);
{
osgUtil::SmoothingVisitor smoother;
smoother.setCreaseAngle(osg::DegreesToRadians(creaseAngle));
geode->accept(smoother);
}
if (shell.valid())
{
geode->addDrawable(shell.get());
}
#endif
transform->addChild(geode.get());