From Stephan Huber, "attached you'll find a first implementation for the obj-plugin to write
obj-files. It is not feature complete but usable. Known issues: * not all materials are handled correctly (especially when using osg::StateAttribute::OVERRIDE), not all properties are supported * could not test point and lines, all of my programs which are capable to read obj-files only import triangle-meshes. * only simple texture-handling"
This commit is contained in:
Robert Osfield
568
src/osgPlugins/obj/OBJWriterNodeVisitor.cpp
Normal file
568
src/osgPlugins/obj/OBJWriterNodeVisitor.cpp
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@@ -0,0 +1,568 @@
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// -*-c++-*-
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/*
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* Wavefront OBJ loader for Open Scene Graph
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*
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* Copyright (C) 2001 Ulrich Hertlein <u.hertlein@web.de>
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*
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* Modified by Robert Osfield to support per Drawable coord, normal and
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* texture coord arrays, bug fixes, and support for texture mapping.
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*
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* Writing support added 2007 by Stephan Huber, http://digitalmind.de,
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* some ideas taken from the dae-plugin
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*
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* The Open Scene Graph (OSG) is a cross platform C++/OpenGL library for
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* real-time rendering of large 3D photo-realistic models.
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* The OSG homepage is http://www.openscenegraph.org/
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*/
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#include <osg/io_utils>
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#include "OBJWriterNodeVisitor.h"
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/** writes all values of an array out to a stream, applies a matrix beforehand if necessary */
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class ValueVisitor : public osg::ValueVisitor {
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public:
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ValueVisitor(std::ostream& fout, const osg::Matrix& m = osg::Matrix::identity(), bool isNormal = false) :
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osg::ValueVisitor(),
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_fout(fout),
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_m(m),
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_isNormal(isNormal)
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{
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_applyMatrix = (_m != osg::Matrix::identity());
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if (_isNormal) _origin = osg::Vec3(0,0,0) * _m;
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}
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virtual void apply (osg::Vec2 & inv)
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{
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_fout << inv[0] << ' ' << inv[1];
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}
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virtual void apply (osg::Vec3 & inv)
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{
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osg::Vec3 v(inv);
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if (_applyMatrix) v = (_isNormal) ? (v * _m) - _origin : v * _m;
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_fout << v[0] << ' ' << v[1] << ' ' << v[2];
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}
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virtual void apply (osg::Vec2b & inv)
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{
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_fout << inv[0] << ' ' << inv[1];
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}
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virtual void apply (osg::Vec3b & inv)
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{
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osg::Vec3 v(inv[0], inv[1], inv[2]);
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if (_applyMatrix) v = (_isNormal) ? (v * _m) - _origin : v * _m;
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_fout << v[0] << ' ' << v[1] << ' ' << v[2];
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}
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virtual void apply (osg::Vec2s & inv)
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{
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_fout << inv[0] << ' ' << inv[1];
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}
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virtual void apply (osg::Vec3s & inv)
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{
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osg::Vec3 v(inv[0], inv[1], inv[2]);
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if (_applyMatrix) v = (_isNormal) ? (v * _m) - _origin : v * _m;
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_fout << v[0] << ' ' << v[1] << ' ' << v[2];
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}
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private:
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std::ostream& _fout;
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osg::Matrix _m;
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bool _applyMatrix, _isNormal;
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osg::Vec3 _origin;
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};
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/** writes all primitives of a primitive-set out to a stream, decomposes quads to triangles, line-strips to lines etc */
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class PrimitiveIndexWriter : public osg::PrimitiveIndexFunctor {
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public:
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PrimitiveIndexWriter(std::ostream& fout,osg::Geometry* geo, unsigned int normalIndex, unsigned int lastVertexIndex, unsigned int lastNormalIndex, unsigned int lastTexIndex) :
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osg::PrimitiveIndexFunctor(),
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_fout(fout),
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_lastVertexIndex(lastVertexIndex),
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_lastNormalIndex(lastNormalIndex),
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_lastTexIndex(lastTexIndex),
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_hasNormalCoords(geo->getNormalArray() != NULL),
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_hasTexCoords(geo->getTexCoordArray(0) != NULL),
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_geo(geo),
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_normalIndex(normalIndex)
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{
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}
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virtual void setVertexArray(unsigned int,const osg::Vec2*) {}
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virtual void setVertexArray(unsigned int ,const osg::Vec3* ) {}
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virtual void setVertexArray(unsigned int,const osg::Vec4* ) {}
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void write(unsigned int i)
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{
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_fout << (i + _lastVertexIndex) << "/";
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if (_hasTexCoords || _hasNormalCoords)
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{
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if (_hasTexCoords)
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_fout << (i + _lastTexIndex);
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_fout << "/";
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if (_hasNormalCoords)
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{
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if (_geo->getNormalBinding() == osg::Geometry::BIND_PER_VERTEX)
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_fout << (i+_lastNormalIndex);
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else
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_fout << (_normalIndex + _lastNormalIndex);
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}
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}
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_fout << " ";
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}
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// operator for triangles
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void writeTriangle(unsigned int i1, unsigned int i2, unsigned int i3)
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{
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_fout << "f ";
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write(i1);
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write(i2);
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write(i3);
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_fout << std::endl;
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// not sure if this is correct?
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if(_geo->getNormalBinding() && _geo->getNormalBinding() == osg::Geometry::BIND_PER_PRIMITIVE) ++_normalIndex;
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}
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// operator for lines
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void writeLine(unsigned int i1, unsigned int i2)
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{
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_fout << "l ";
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write(i1);
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write(i2);
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_fout << std::endl;
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// not sure if this is correct?
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if(_geo->getNormalBinding() && _geo->getNormalBinding() == osg::Geometry::BIND_PER_PRIMITIVE) ++_normalIndex;
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}
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// operator for points
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void writePoint(unsigned int i1)
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{
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_fout << "p ";
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write(i1);
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_fout << std::endl;
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// not sure if this is correct?
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if(_geo->getNormalBinding() && _geo->getNormalBinding() == osg::Geometry::BIND_PER_PRIMITIVE) ++_normalIndex;
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}
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virtual void begin(GLenum mode)
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{
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_modeCache = mode;
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_indexCache.clear();
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}
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virtual void vertex(unsigned int vert)
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{
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_indexCache.push_back(vert);
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}
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virtual void end()
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{
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if (!_indexCache.empty())
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{
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drawElements(_modeCache,_indexCache.size(),&_indexCache.front());
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}
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}
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virtual void drawArrays(GLenum mode,GLint first,GLsizei count);
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virtual void drawElements(GLenum mode,GLsizei count,const GLubyte* indices)
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{
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drawElementsImplementation<GLubyte>(mode, count, indices);
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}
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virtual void drawElements(GLenum mode,GLsizei count,const GLushort* indices)
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{
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drawElementsImplementation<GLushort>(mode, count, indices);
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}
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virtual void drawElements(GLenum mode,GLsizei count,const GLuint* indices)
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{
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drawElementsImplementation<GLuint>(mode, count, indices);
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}
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protected:
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template<typename T>void drawElementsImplementation(GLenum mode, GLsizei count, const T* indices)
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{
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if (indices==0 || count==0) return;
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typedef const T* IndexPointer;
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switch(mode)
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{
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case(GL_TRIANGLES):
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{
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IndexPointer ilast = &indices[count];
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for(IndexPointer iptr=indices;iptr<ilast;iptr+=3)
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writeTriangle(*iptr,*(iptr+1),*(iptr+2));
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break;
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}
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case(GL_TRIANGLE_STRIP):
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{
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IndexPointer iptr = indices;
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for(GLsizei i=2;i<count;++i,++iptr)
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{
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if ((i%2)) writeTriangle(*(iptr),*(iptr+2),*(iptr+1));
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else writeTriangle(*(iptr),*(iptr+1),*(iptr+2));
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}
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break;
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}
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case(GL_QUADS):
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{
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IndexPointer iptr = indices;
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for(GLsizei i=3;i<count;i+=4,iptr+=4)
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{
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writeTriangle(*(iptr),*(iptr+1),*(iptr+2));
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writeTriangle(*(iptr),*(iptr+2),*(iptr+3));
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}
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break;
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}
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case(GL_QUAD_STRIP):
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{
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IndexPointer iptr = indices;
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for(GLsizei i=3;i<count;i+=2,iptr+=2)
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{
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writeTriangle(*(iptr),*(iptr+1),*(iptr+2));
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writeTriangle(*(iptr+1),*(iptr+3),*(iptr+2));
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}
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break;
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}
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case(GL_POLYGON): // treat polygons as GL_TRIANGLE_FAN
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case(GL_TRIANGLE_FAN):
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{
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IndexPointer iptr = indices;
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unsigned int first = *iptr;
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++iptr;
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for(GLsizei i=2;i<count;++i,++iptr)
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{
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writeTriangle(first,*(iptr),*(iptr+1));
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}
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break;
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}
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case(GL_POINTS):
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{
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IndexPointer ilast = &indices[count];
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for(IndexPointer iptr=indices;iptr<ilast;++iptr)
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{
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writePoint(*iptr);
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}
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break;
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}
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case(GL_LINES):
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{
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IndexPointer ilast = &indices[count];
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for(IndexPointer iptr=indices;iptr<ilast;iptr+=2)
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{
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writeLine(*iptr, *(iptr+1));
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}
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break;
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}
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case(GL_LINE_STRIP):
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{
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IndexPointer ilast = &indices[count];
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for(IndexPointer iptr=indices+1;iptr<ilast;iptr+=2)
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{
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writeLine(*(iptr-1), *iptr);
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}
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break;
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}
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case(GL_LINE_LOOP):
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{
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IndexPointer ilast = &indices[count];
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for(IndexPointer iptr=indices+1;iptr<ilast;iptr+=2)
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{
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writeLine(*(iptr-1), *iptr);
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}
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writeLine(*ilast, *indices);
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break;
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}
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default:
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// uhm should never come to this point :)
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break;
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}
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}
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private:
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std::ostream& _fout;
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GLenum _modeCache;
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std::vector<GLuint> _indexCache;
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unsigned int _lastVertexIndex, _lastNormalIndex, _lastTexIndex;
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bool _hasNormalCoords, _hasTexCoords;
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osg::Geometry* _geo;
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unsigned int _normalIndex;
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};
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void PrimitiveIndexWriter::drawArrays(GLenum mode,GLint first,GLsizei count)
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{
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switch(mode)
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{
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case(GL_TRIANGLES):
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{
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unsigned int pos=first;
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for(GLsizei i=2;i<count;i+=3,pos+=3)
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{
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writeTriangle(pos,pos+1,pos+2);
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}
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break;
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}
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case(GL_TRIANGLE_STRIP):
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{
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unsigned int pos=first;
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for(GLsizei i=2;i<count;++i,++pos)
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{
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if ((i%2)) writeTriangle(pos,pos+2,pos+1);
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else writeTriangle(pos,pos+1,pos+2);
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}
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break;
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}
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case(GL_QUADS):
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{
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unsigned int pos=first;
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for(GLsizei i=3;i<count;i+=4,pos+=4)
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{
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writeTriangle(pos,pos+1,pos+2);
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writeTriangle(pos,pos+2,pos+3);
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}
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break;
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}
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case(GL_QUAD_STRIP):
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{
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unsigned int pos=first;
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for(GLsizei i=3;i<count;i+=2,pos+=2)
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{
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writeTriangle(pos,pos+1,pos+2);
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writeTriangle(pos+1,pos+3,pos+2);
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}
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break;
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}
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case(GL_POLYGON): // treat polygons as GL_TRIANGLE_FAN
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case(GL_TRIANGLE_FAN):
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{
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unsigned int pos=first+1;
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for(GLsizei i=2;i<count;++i,++pos)
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{
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writeTriangle(first,pos,pos+1);
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}
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break;
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}
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case(GL_POINTS):
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{
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for(GLsizei i=0;i<count;++i)
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{
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writePoint(i);
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}
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break;
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}
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case(GL_LINES):
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{
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for(GLsizei i=0;i<count;i+=2)
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{
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writeLine(i, i+1);
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}
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break;
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}
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case(GL_LINE_STRIP):
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{
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for(GLsizei i=1;i<count;++i)
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{
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writeLine(i-1, i);
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}
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break;
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}
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case(GL_LINE_LOOP):
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{
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for(GLsizei i=1;i<count;++i)
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{
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writeLine(i-1, i);
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}
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writeLine(count-1, 0);
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break;
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}
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default:
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osg::notify(osg::WARN) << "OBJWriterNodeVisitor :: can't handle mode " << mode << std::endl;
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break;
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}
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}
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OBJWriterNodeVisitor::OBJMaterial::OBJMaterial(osg::Material* mat, osg::Texture* tex) :
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diffuse(1,1,1,1),
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ambient(0.2,0.2,0.2,1),
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specular(0,0,0,1),
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image("")
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{
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static unsigned int s_objmaterial_id = 0;
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++s_objmaterial_id;
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std::stringstream ss;
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ss << "material_" << s_objmaterial_id;
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name = ss.str();
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if (mat) {
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diffuse = mat->getDiffuse(osg::Material::FRONT);
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ambient = mat->getAmbient(osg::Material::FRONT);
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specular = mat->getSpecular(osg::Material::FRONT);
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}
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if (tex) {
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osg::Image* img = tex->getImage(0);
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if ((img) && (!img->getFileName().empty()))
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image = img->getFileName();
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}
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}
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||||
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std::ostream& operator<<(std::ostream& fout, const OBJWriterNodeVisitor::OBJMaterial& mat) {
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fout << "newmtl " << mat.name << std::endl;
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||||
fout << " " << "Ka " << mat.ambient << std::endl;
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||||
fout << " " << "Kd " << mat.diffuse << std::endl;
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||||
fout << " " << "Ks " << mat.specular << std::endl;
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||||
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if(!mat.image.empty())
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fout << " " << "map_Kd " << mat.image << std::endl;
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||||
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return fout;
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||||
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||||
}
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||||
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||||
void OBJWriterNodeVisitor::writeMaterials(std::ostream& fout)
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||||
{
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||||
for(MaterialMap::iterator i = _materialMap.begin(); i != _materialMap.end(); ++i)
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||||
{
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||||
fout << (*i).second << std::endl;
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||||
}
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||||
}
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||||
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||||
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std::string OBJWriterNodeVisitor::getUniqueName(const std::string& defaultvalue) {
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||||
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||||
std::string name = "";
|
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for(std::list<std::string>::iterator i = _nameStack.begin(); i != _nameStack.end(); ++i) {
|
||||
if (!name.empty()) name+="_";
|
||||
name += (*i);
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||||
}
|
||||
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||||
if (!defaultvalue.empty())
|
||||
name += "_" +defaultvalue;
|
||||
|
||||
if (_nameMap.find(name) == _nameMap.end())
|
||||
_nameMap.insert(std::make_pair(name, 0));
|
||||
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||||
std::stringstream ss;
|
||||
ss << name << "_" << _nameMap[name];
|
||||
++(_nameMap[name]);
|
||||
return ss.str();
|
||||
|
||||
}
|
||||
|
||||
void OBJWriterNodeVisitor::processArray(const std::string& key, osg::Array* array, const osg::Matrix& m, bool isNormal)
|
||||
{
|
||||
if (array == NULL)
|
||||
return;
|
||||
|
||||
ValueVisitor vv(_fout, m, isNormal);
|
||||
_fout << std::endl;
|
||||
for(unsigned int i = 0; i < array->getNumElements(); ++i) {
|
||||
_fout << key << ' ';
|
||||
array->accept(i, vv);
|
||||
_fout << std::endl;
|
||||
}
|
||||
|
||||
_fout << "# " << array->getNumElements() << " elements written" << std::endl;
|
||||
|
||||
}
|
||||
|
||||
void OBJWriterNodeVisitor::processStateSet(osg::StateSet* ss)
|
||||
{
|
||||
if (_materialMap.find(ss) != _materialMap.end()) {
|
||||
_fout << "usemtl " << _materialMap[ss].name << std::endl;
|
||||
return;
|
||||
}
|
||||
|
||||
osg::Material* mat = dynamic_cast<osg::Material*>(ss->getAttribute(osg::StateAttribute::MATERIAL));
|
||||
osg::Texture* tex = dynamic_cast<osg::Texture*>(ss->getTextureAttribute(0, osg::StateAttribute::TEXTURE));
|
||||
|
||||
if (mat || tex)
|
||||
{
|
||||
_materialMap.insert(std::make_pair(ss, OBJMaterial(mat, tex)));
|
||||
_fout << "usemtl " << _materialMap[ss].name << std::endl;
|
||||
}
|
||||
|
||||
}
|
||||
|
||||
|
||||
void OBJWriterNodeVisitor::processGeometry(osg::Geometry* geo, osg::Matrix& m) {
|
||||
_fout << std::endl;
|
||||
_fout << "o " << getUniqueName( geo->getName().empty() ? geo->className() : geo->getName() ) << std::endl;
|
||||
|
||||
processStateSet(_currentStateSet.get());
|
||||
|
||||
processArray("v", geo->getVertexArray(), m, false);
|
||||
processArray("vn", geo->getNormalArray(), m, true);
|
||||
processArray("vt", geo->getTexCoordArray(0)); // we support only tex-unit 0
|
||||
unsigned int normalIndex = 0;
|
||||
for(unsigned int i = 0; i < geo->getNumPrimitiveSets(); ++i)
|
||||
{
|
||||
osg::PrimitiveSet* ps = geo->getPrimitiveSet(i);
|
||||
|
||||
PrimitiveIndexWriter pif(_fout, geo, normalIndex, _lastVertexIndex, _lastNormalIndex, _lastTexIndex);
|
||||
ps->accept(pif);
|
||||
|
||||
if(geo->getNormalArray() && geo->getNormalBinding() == osg::Geometry::BIND_PER_PRIMITIVE_SET)
|
||||
++normalIndex;
|
||||
}
|
||||
if (geo->getVertexArray())
|
||||
_lastVertexIndex += geo->getVertexArray()->getNumElements();
|
||||
if (geo->getNormalArray())
|
||||
_lastNormalIndex += geo->getNormalArray()->getNumElements();
|
||||
if(geo->getTexCoordArray(0))
|
||||
_lastTexIndex += geo->getTexCoordArray(0)->getNumElements();
|
||||
|
||||
}
|
||||
|
||||
void OBJWriterNodeVisitor::apply( osg::Geode &node )
|
||||
{
|
||||
|
||||
pushStateSet(node.getStateSet());
|
||||
_nameStack.push_back(node.getName());
|
||||
osg::Matrix m = osg::computeLocalToWorld(getNodePath());
|
||||
unsigned int count = node.getNumDrawables();
|
||||
for ( unsigned int i = 0; i < count; i++ )
|
||||
{
|
||||
osg::Geometry *g = node.getDrawable( i )->asGeometry();
|
||||
if ( g != NULL )
|
||||
{
|
||||
pushStateSet(g->getStateSet());
|
||||
|
||||
processGeometry(g,m);
|
||||
|
||||
popStateSet(g->getStateSet());
|
||||
}
|
||||
}
|
||||
|
||||
|
||||
popStateSet(node.getStateSet());
|
||||
_nameStack.pop_back();
|
||||
}
|
||||
|
||||
|
||||
|
||||
Reference in New Issue
Block a user