Implemented the shell geometry code
This commit is contained in:
Robert Osfield
parent
610b3ec360
commit
6049f67a48
@ -17,6 +17,7 @@
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#include <osg/TriangleIndexFunctor>
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#include <osg/LineWidth>
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#include <osgUtil/Tessellator>
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#include <osg/CullFace>
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#include <limits.h>
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@ -782,7 +783,225 @@ osg::Geometry* computeTextGeometry(osg::Geometry* glyphGeometry, BevelProfile& p
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//
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osg::Geometry* computeShellGeometry(osg::Geometry* glyphGeometry, BevelProfile& profile, float width)
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{
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osg::Vec3Array* orig_vertices = dynamic_cast<osg::Vec3Array*>(glyphGeometry->getVertexArray());
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if (!orig_vertices)
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{
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OSG_NOTICE<<"computeTextGeometry(..): No vertices on glyphGeometry."<<std::endl;
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return 0;
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}
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osg::ref_ptr<osg::Geometry> text_geometry = new osg::Geometry;
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osg::ref_ptr<osg::Vec3Array> vertices = new osg::Vec3Array;
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text_geometry->setVertexArray(vertices.get());
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typedef std::vector<unsigned int> Indices;
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const unsigned int NULL_VALUE = UINT_MAX;
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Indices front_indices, back_indices;
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front_indices.resize(orig_vertices->size(), NULL_VALUE);
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back_indices.resize(orig_vertices->size(), NULL_VALUE);
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osg::DrawElementsUShort* face = 0;
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osg::Geometry::PrimitiveSetList bevelPrimitiveSets;
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osg::Geometry::PrimitiveSetList shellPrimitiveSets;
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osg::Vec3 frontOffset(0,0,width);
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osg::Vec3 backOffset(0,0,-2.0*width);
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osg::Vec3 forward(backOffset-frontOffset);
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// collect bevels and face primitive sets
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for(osg::Geometry::PrimitiveSetList::iterator itr = glyphGeometry->getPrimitiveSetList().begin();
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itr != glyphGeometry->getPrimitiveSetList().end();
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++itr)
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{
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osg::PrimitiveSet* prim = itr->get();
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if (prim->getName()=="face") face = dynamic_cast<osg::DrawElementsUShort*>(prim);
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else if (prim->getName()=="bevel") bevelPrimitiveSets.push_back(prim);
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else if (prim->getName()=="shell") shellPrimitiveSets.push_back(prim);
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}
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// if we don't have a face we can't create any 3d text
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if (!face) return 0;
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// build up the vertices primitives for the front face, and record the indices
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// for later use, and to ensure sharing of vertices in the face primitive set
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// the order of the triangle indices are flipped to make sure that the triangles are back face
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osg::DrawElementsUShort* frontFace = new osg::DrawElementsUShort(GL_TRIANGLES);
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text_geometry->addPrimitiveSet(frontFace);
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for(unsigned int i=0; i<face->size()-2;)
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{
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unsigned int p1 = (*face)[i++];
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unsigned int p2 = (*face)[i++];
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unsigned int p3 = (*face)[i++];
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if (front_indices[p1]==NULL_VALUE)
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{
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front_indices[p1] = vertices->size();
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vertices->push_back((*orig_vertices)[p1]+frontOffset);
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}
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if (front_indices[p2]==NULL_VALUE)
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{
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front_indices[p2] = vertices->size();
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vertices->push_back((*orig_vertices)[p2]+frontOffset);
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}
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if (front_indices[p3]==NULL_VALUE)
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{
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front_indices[p3] = vertices->size();
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vertices->push_back((*orig_vertices)[p3]+frontOffset);
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}
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frontFace->push_back(front_indices[p1]);
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frontFace->push_back(front_indices[p3]);
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frontFace->push_back(front_indices[p2]);
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}
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// build up the vertices primitives for the back face, and record the indices
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// for later use, and to ensure sharing of vertices in the face primitive set
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osg::DrawElementsUShort* backFace = new osg::DrawElementsUShort(GL_TRIANGLES);
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text_geometry->addPrimitiveSet(backFace);
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for(unsigned int i=0; i<face->size();)
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{
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unsigned int pi = (*face)[i++];
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if (back_indices[pi]==NULL_VALUE)
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{
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back_indices[pi] = vertices->size();
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vertices->push_back((*orig_vertices)[pi]+backOffset);
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}
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backFace->push_back(back_indices[pi]);
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}
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for(osg::Geometry::PrimitiveSetList::iterator itr = bevelPrimitiveSets.begin();
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itr != bevelPrimitiveSets.end();
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++itr)
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{
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osg::DrawElementsUShort* strip = dynamic_cast<osg::DrawElementsUShort*>(itr->get());
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if (!strip) continue;
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osg::CopyOp copyop(osg::CopyOp::DEEP_COPY_ALL);
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osg::DrawElementsUShort* front_strip = dynamic_cast<osg::DrawElementsUShort*>(copyop(strip));
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text_geometry->addPrimitiveSet(front_strip);
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for(unsigned int i=0; i<front_strip->size(); ++i)
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{
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unsigned short& pi = (*front_strip)[i];
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if (front_indices[pi]==NULL_VALUE)
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{
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front_indices[pi] = vertices->size();
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vertices->push_back((*orig_vertices)[pi]+frontOffset);
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}
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pi = front_indices[pi];
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}
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for(unsigned int i=0; i<front_strip->size()-1;)
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{
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unsigned short& p1 = (*front_strip)[i++];
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unsigned short& p2 = (*front_strip)[i++];
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std::swap(p1,p2);
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}
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osg::DrawElementsUShort* back_strip = dynamic_cast<osg::DrawElementsUShort*>(copyop(strip));
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text_geometry->addPrimitiveSet(back_strip);
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for(unsigned int i=0; i<back_strip->size(); ++i)
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{
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unsigned short& pi = (*back_strip)[i];
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if (back_indices[pi]==NULL_VALUE)
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{
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back_indices[pi] = vertices->size();
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vertices->push_back((*orig_vertices)[pi]+backOffset);
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}
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pi = back_indices[pi];
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}
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}
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// now build up the shell
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for(osg::Geometry::PrimitiveSetList::iterator itr = shellPrimitiveSets.begin();
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itr != shellPrimitiveSets.end();
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++itr)
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{
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osg::DrawElementsUShort* bevel = dynamic_cast<osg::DrawElementsUShort*>(itr->get());
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if (!bevel) continue;
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unsigned int no_vertices_on_boundary = bevel->size()/2;
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osgText::BevelProfile::Vertices& profileVertices = profile.getVertices();
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unsigned int no_vertices_on_bevel = profileVertices.size();
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Indices bevelIndices;
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bevelIndices.resize(no_vertices_on_boundary*no_vertices_on_bevel, NULL_VALUE);
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// populate vertices
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for(unsigned int i=0; i<no_vertices_on_boundary; ++i)
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{
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unsigned int topi = (*bevel)[i*2+1];
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unsigned int basei = (*bevel)[i*2];
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osg::Vec3 top_vertex = (*orig_vertices)[ topi ] + frontOffset;
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osg::Vec3 base_vertex = (*orig_vertices)[ basei ] + frontOffset;
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osg::Vec3 up = top_vertex-base_vertex;
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if (front_indices[basei]==NULL_VALUE)
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{
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front_indices[basei] = vertices->size();
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vertices->push_back(base_vertex);
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}
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bevelIndices[i*no_vertices_on_bevel + 0] = front_indices[basei];
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for(unsigned int j=1; j<no_vertices_on_bevel-1; ++j)
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{
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const osg::Vec2& pv = profileVertices[j];
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osg::Vec3 pos( base_vertex + (forward * pv.x()) + (up * pv.y()) );
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bevelIndices[i*no_vertices_on_bevel + j] = vertices->size();
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vertices->push_back(pos);
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}
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if (back_indices[basei]==NULL_VALUE)
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{
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back_indices[basei] = vertices->size();
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vertices->push_back(base_vertex + forward);
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}
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bevelIndices[i*no_vertices_on_bevel + no_vertices_on_bevel-1] = back_indices[basei];
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}
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osg::DrawElementsUShort* elements = new osg::DrawElementsUShort(GL_TRIANGLES);
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unsigned int base, next;
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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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base = i*no_vertices_on_bevel + j;
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next = base + no_vertices_on_bevel;
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elements->push_back(bevelIndices[base]);
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elements->push_back(bevelIndices[base+1]);
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elements->push_back(bevelIndices[next]);
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elements->push_back(bevelIndices[base+1]);
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elements->push_back(bevelIndices[next+1]);
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elements->push_back(bevelIndices[next]);
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}
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}
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text_geometry->addPrimitiveSet(elements);
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}
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#if 1
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osg::Vec4Array* new_colours = new osg::Vec4Array;
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new_colours->push_back(osg::Vec4(1.0,1.0,1.0,0.2));
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text_geometry->setColorArray(new_colours);
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text_geometry->setColorBinding(osg::Geometry::BIND_OVERALL);
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osg::StateSet* stateset = text_geometry->getOrCreateStateSet();
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stateset->setMode(GL_BLEND, osg::StateAttribute::ON);
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stateset->setMode(GL_LIGHTING, osg::StateAttribute::OFF);
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stateset->setAttributeAndModes(new osg::CullFace, osg::StateAttribute::ON);
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//stateset->setRenderingHint(osg::StateSet::TRANSPARENT_BIN);
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stateset->setRenderBinDetails(11, "SORT_FRONT_TO_BACK");
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#endif
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return text_geometry.release();
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}
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}
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@ -614,7 +614,7 @@ int main(int argc, char** argv)
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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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float creaseAngle = 30.0f;
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while(arguments.read("--crease-angle",creaseAngle)) {}
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OSG_NOTICE<<"creaseAngle="<<creaseAngle<<std::endl;
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@ -650,9 +650,9 @@ int main(int argc, char** argv)
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osg::ref_ptr<osg::Geometry> glyphGeometry = osgText::computeGlyphGeometry(glyph.get(), thickness, width);
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osg::ref_ptr<osg::Geometry> textGeometry = osgText::computeTextGeometry(glyphGeometry.get(), profile, width);
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osg::ref_ptr<osg::Geometry> shellGeometry = osgText::computeShellGeometry(glyphGeometry.get(), profile, width);
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if (textGeometry.valid())
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{
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geode->addDrawable(textGeometry.get());
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if (textGeometry.valid()) geode->addDrawable(textGeometry.get());
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if (shellGeometry.valid()) geode->addDrawable(shellGeometry.get());
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// create the normals
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if (true)
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{
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@ -660,9 +660,6 @@ int main(int argc, char** argv)
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smoother.setCreaseAngle(osg::DegreesToRadians(creaseAngle));
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geode->accept(smoother);
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}
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}
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if (shellGeometry.valid()) geode->addDrawable(shellGeometry.get());
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#else
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osg::Vec3Array* vertices = glyph->getRawVertexArray();
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osg::Geometry::PrimitiveSetList& primitives = glyph->getRawFacePrimitiveSetList();
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