Hi all
once i've wrote small utility to optimize models with rig geometry, which,
among other things, apply INDEX_MESH, VERTEX_PRETRANSFORM, VERTEX_POSTTRANSFORM
optimizations and remaps vertex influences of rig geometry to new vertex
indices. Now it suddenly dont work any more.
Problem is that after indexing geometry, there are not enough matches between
old vertex attributes and new vertex attributes (some old vertex attribute
values cant be found in new vertex attribute arrays after indexing, which means
some data is lost).
here is some simplified code to show problem:
//////////////////////////////////////////////////////////////
template <typename T> bool compare(T* r, unsigned ri, T* l, unsigned li)
//compares two array elements
{
if ((*r)[ri] < (*l)[li])
return false;
if ((*l)[li] < (*r)[ri])
return false;
return true;
}
bool cmp (osg::Geometry::ArrayList& rhs, unsigned rhsi,
osg::Geometry::ArrayList& lhs, unsigned lhsi) //compares all [rhsi] elements
from rhs array list with all [lhsi] elements in lhs array list
{
if (rhs.size() != lhs.size())
throw std::logic_error("different vertex attrib arrays count
before and after optimizations, cant do anything");
bool result = true;
for (unsigned i = 0; i< rhs.size(); i++)
{
bool compared = false;
if (!result)
return result;
{
osg::Vec3Array* r =
dynamic_cast<osg::Vec3Array*>(rhs[i]);
osg::Vec3Array* l =
dynamic_cast<osg::Vec3Array*>(lhs[i]);
if (r && l)
{
result = result && compare<>(r, rhsi, l, lhsi);
compared = true;
}
}
{
osg::Vec2Array* r =
dynamic_cast<osg::Vec2Array*>(rhs[i]);
osg::Vec2Array* l =
dynamic_cast<osg::Vec2Array*>(lhs[i]);
if (r && l)
{
result = result && compare<>(r, rhsi, l, lhsi);
compared = true;
}
}
if (!compared)
return false;
}
return result;
}
void acceptMesh(osgAnimation::RigGeometry* rg)
{
osg::Geometry* g = rg->getSourceGeometry();
osg::ref_ptr<osg::Geometry> origG = new osg::Geometry(*g,
osg::CopyOp::DEEP_COPY_ALL);
osg::Geometry::ArrayList alold;
origG->getArrayList(alold);
osg::ref_ptr<osg::Vec3Array> origVerts =
dynamic_cast<osg::Vec3Array*>(origG->getVertexArray());
osgUtil::IndexMeshVisitor imv;
imv.makeMesh(*g);
osg::Geometry::ArrayList alnew;
g->getArrayList(alnew);
std::map<int, int> vertsMap;//store matches between old and new
vertexattrib arrays in pairs [old_index, new_index]
osg::ref_ptr<osg::Vec3Array> newVerts =
dynamic_cast<osg::Vec3Array*>(g->getVertexArray());
unsigned id = 0;
for (osg::Vec3Array::iterator itr = origVerts->begin(); itr !=
origVerts->end(); itr++)
{
unsigned nid = 0;
for (osg::Vec3Array::iterator itr2 = newVerts->begin();
itr2 != newVerts->end(); itr2++)
{
if (cmp(alold, id, alnew, nid))//found match
{
vertsMap[id] = nid;
break;
}
nid++;
}
id++;
}
std::cerr<<"origVerts size:"<<origVerts->size()<<std::endl;
std::cerr<<"verts map size:"<<vertsMap.size()<<std::endl;
}
/////////////////////////////////////////////////////////////
here size of vertsMap map should be same as original vertex count, and it isnt,
which means some data is lost when indexing geometry (and comparing floating
point values with thresholds does not change anything, i've tested it).
Any ideas about what could go wrong? May be there was some changes to the way
IndexMeshVisitor works? I'm testing on osg svn version updated last week or so.
Cheers,
Sergey.
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