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Merge branch 'fix/objwriter-double-prec' into 'master'

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OBJ Reader/Writer: avoid precision loss

See merge request OpenMesh/OpenMesh!349
This commit is contained in:
Jan Möbius
2024-05-07 08:42:15 +00:00
parent 961acb9e3d 9eefd50027
commit f8954fb5e5
3 changed files with 23 additions and 15 deletions
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1
Doc/changelog.docu
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@@ -26,6 +26,7 @@
<b>IO</b>
<ul>
<li>PLY reader/writer: Fixed color trait Vec3f compilation for PLY writer</li>
<li>OBJ Reader/Writer: Avoid precision loss when writing coordinates and normals.</li>
</ul>
<b>Build System</b>

4
src/OpenMesh/Core/IO/reader/OBJReader.cc
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@@ -287,8 +287,8 @@ read_vertices(std::istream& _in, BaseImporter& _bi, Options& _opt,
std::vector<VertexHandle> & vertexHandles,
Options & fileOptions)
{
float x, y, z, u, v, w;
float r, g, b;
double x, y, z, u, v, w;
double r, g, b;
std::string line;
std::string keyWrd;

33
src/OpenMesh/Core/IO/writer/OBJWriter.cc
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@@ -216,8 +216,6 @@ _OBJWriter_::
write(std::ostream& _out, BaseExporter& _be, const Options& _writeOptions, std::streamsize _precision) const
{
unsigned int idx;
Vec3f v, n;
Vec2f t;
VertexHandle vh;
std::vector<VertexHandle> vhandles;
bool useMatrial = false;
@@ -296,7 +294,7 @@ write(std::ostream& _out, BaseExporter& _be, const Options& _writeOptions, std::
for (size_t i=0, nV=_be.n_vertices(); i<nV; ++i)
{
vh = VertexHandle(static_cast<int>(i));
t = _be.texcoord(vh);
Vec2f t = _be.texcoord(vh);
texMap[t] = static_cast<int>(i);
}
}
@@ -313,18 +311,27 @@ write(std::ostream& _out, BaseExporter& _be, const Options& _writeOptions, std::
}
}
// vertex data (point, normals, texcoords)
const bool normal_double = _be.is_normal_double();
const bool point_double = _be.is_point_double();
for (size_t i=0, nV=_be.n_vertices(); i<nV; ++i)
{
vh = VertexHandle(int(i));
v = _be.point(vh);
n = _be.normal(vh);
t = _be.texcoord(vh);
_out << "v " << v[0] <<" "<< v[1] <<" "<< v[2] << '\n';
if (_writeOptions.check(Options::VertexNormal))
_out << "vn " << n[0] <<" "<< n[1] <<" "<< n[2] << '\n';
vh = VertexHandle(int(i));
if (point_double) {
auto v = _be.pointd(vh);
_out << "v " << v[0] <<" "<< v[1] <<" "<< v[2] << '\n';
} else {
auto v = _be.point(vh);
_out << "v " << v[0] <<" "<< v[1] <<" "<< v[2] << '\n';
}
if (_writeOptions.check(Options::VertexNormal)) {
if (normal_double) {
auto n = _be.normald(vh);
_out << "vn " << n[0] <<" "<< n[1] <<" "<< n[2] << '\n';
} else {
auto n = _be.normal(vh);
_out << "vn " << n[0] <<" "<< n[1] <<" "<< n[2] << '\n';
}
}
}
size_t lastMat = std::numeric_limits<std::size_t>::max();