struct Subset
{
std::vector<float> vertexs;//位置
std::vector<float> normals;//法向
std::vector<float> texCoords;//纹理
std::vector<unsigned int> indices;//索引下标
std::vector<unsigned int> faceMtrls;//面材质索引
}; class GetSimplifySTLDataVisitor : public osg::NodeVisitor
{
public:
GetSimplifySTLDataVisitor(Subset &s):dstSubset(s),
osg::NodeVisitor(osg::NodeVisitor::TRAVERSE_ALL_CHILDREN)
{
} virtual void apply(osg::Geode& geode)
{
unsigned int count = geode.getNumDrawables();
for ( unsigned int i = ; i < count; i++ )
{
osg::Geometry *geometry = geode.getDrawable( i )->asGeometry();
if ( !geometry )
continue;
// 顶点数据
osg::Vec3Array* vertices = dynamic_cast<osg::Vec3Array*>(geometry->getVertexArray());
int vertexlNum = vertices->size();
for ( int i=; i<vertexlNum; i++) {
dstSubset.vertexs.push_back( vertices->at(i).x() );
dstSubset.vertexs.push_back( vertices->at(i).y() );
dstSubset.vertexs.push_back( vertices->at(i).z() );
}
// 法向量
osg::Vec3Array* normals = dynamic_cast<osg::Vec3Array*>(geometry->getNormalArray());
int normalNum = normals->size();
for (int i=; i<normalNum; i++) {
dstSubset.normals.push_back( normals->at(i).x() );
dstSubset.normals.push_back( normals->at(i).y() );
dstSubset.normals.push_back( normals->at(i).z() );
}
normalBindKinds.insert(geometry->getNormalBinding());
if(osg::Geometry::BIND_PER_VERTEX != geometry->getNormalBinding() )
{
std::string msg="未处理的法向量绑定方式";
MessageBox(, LPCTSTR(msg.c_str()), "警告", MB_OK);
}
// 索引数组
for ( unsigned int i = ; i < geometry->getNumPrimitiveSets(); ++i )
{
osg::PrimitiveSet* ps = geometry->getPrimitiveSet( i );
if ( !ps ) continue;
pts.insert(ps->getType());
modes.insert(ps->getMode());
switch( ps->getType() )
{
case osg::PrimitiveSet::DrawElementsUIntPrimitiveType :
{
osg::DrawElementsUInt* deui = dynamic_cast<osg::DrawElementsUInt*>(ps);
const unsigned indexNum = deui->getNumIndices();
switch( deui->getMode() )
{
case osg::PrimitiveSet::TRIANGLES :
{
for (unsigned int i=; i<indexNum; i++)
{
dstSubset.indices.push_back( deui->at(i) );
}
break;
}
default:
{
std::string msg="未处理的绘制模式";
MessageBox(, LPCTSTR(msg.c_str()), "警告", MB_OK);
}
}
break;
}
case osg::PrimitiveSet::DrawElementsUShortPrimitiveType :
{
osg::DrawElementsUShort* de = dynamic_cast<osg::DrawElementsUShort*>(ps);
const unsigned indexNum = de->getNumIndices();
switch( de->getMode() )
{
case osg::PrimitiveSet::TRIANGLES :
{
for (unsigned int i=; i<indexNum; i++)
{
dstSubset.indices.push_back( de->at(i) );
}
break;
}
case osg::PrimitiveSet::TRIANGLE_STRIP :
{
for (unsigned int i=; i<indexNum-; i++)
{
//此处索引为何与基数偶数有关，可百度GL_TRIANGLE_STRIP
if (i%==)
{
dstSubset.indices.push_back( de->at(i) );
dstSubset.indices.push_back( de->at(i+) );
dstSubset.indices.push_back( de->at(i+) );
}
else
{
dstSubset.indices.push_back( de->at(i) );
dstSubset.indices.push_back( de->at(i+) );
dstSubset.indices.push_back( de->at(i+) );
}
}
break;
}
default:
{
std::string msg="未处理的绘制模式";
MessageBox(, LPCTSTR(msg.c_str()), "警告", MB_OK);
}
}
break;
}
case osg::PrimitiveSet::DrawArraysPrimitiveType :
{
osg::DrawArrays* da = dynamic_cast<osg::DrawArrays*>(ps);
int first=da->getFirst();
int count=da->getCount();
switch( da->getMode() )
{
case osg::PrimitiveSet::TRIANGLES :
{
for ( int i=first; i<first+count; i++) {
dstSubset.indices.push_back( i );
}
break;
}
case osg::PrimitiveSet::TRIANGLE_STRIP :
{
for ( int i=first; i<first+count-; i++) {
if(i%==)
{
dstSubset.indices.push_back( i );
dstSubset.indices.push_back( i+ );
dstSubset.indices.push_back( i+ );
}
else
{
dstSubset.indices.push_back( i );
dstSubset.indices.push_back( i+ );
dstSubset.indices.push_back( i+ );
}
}
break;
}
default:
{
std::string msg="未处理的绘制模式";
MessageBox(, LPCTSTR(msg.c_str()), "警告", MB_OK);
}
}
break;
}
default:
{
std::string msg="未处理的图元类型";
MessageBox(, LPCTSTR(msg.c_str()), "警告", MB_OK);
}
}
}
}
}
private:
Subset &dstSubset;
//以下三个数组用来测试
std::set<osg::Geometry::AttributeBinding> normalBindKinds;
std::set<osg::PrimitiveSet::Type> pts;
std::set<GLenum> modes;
};