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Improved accuracy of ModelVolume matrix store / restore

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into the 3MF / AMF.
Improved accuracy of ModelVolume's mesh transform back from Object's
coordinate space to its own coordinate space after reloading
from 3MF / AMF.
This commit is contained in:
bubnikv 2019-12-19 10:22:46 +01:00
parent 2bf472988b
commit 26b7dbd6f5
5 changed files with 73 additions and 68 deletions
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38
src/libslic3r/Format/3mf.cpp
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@ -34,10 +34,12 @@ namespace pt = boost::property_tree;
// VERSION NUMBERS
// 0 : .3mf, files saved by older slic3r or other applications. No version definition in them.
// 1 : Introduction of 3mf versioning. No other change in data saved into 3mf files.
// 2 : Meshes saved in their local system; Volumes' matrices and source data added to Metadata/Slic3r_PE_model.config file.
// 2 : Volumes' matrices and source data added to Metadata/Slic3r_PE_model.config file, meshes transformed back to their coordinate system on loading.
// WARNING !! -> the version number has been rolled back to 1
// the next change should use 3
const unsigned int VERSION_3MF = 1;
// Allow loading version 2 file as well.
const unsigned int VERSION_3MF_COMPATIBLE = 2;
const char* SLIC3RPE_3MF_VERSION = "slic3rpe:Version3mf"; // definition of the metadata name saved into .model file
const std::string MODEL_FOLDER = "3D/";
@ -1513,7 +1515,7 @@ namespace Slic3r {
{
m_version = (unsigned int)atoi(m_curr_characters.c_str());
if (m_check_version && (m_version > VERSION_3MF))
if (m_check_version && (m_version > VERSION_3MF_COMPATIBLE))
{
// std::string msg = _(L("The selected 3mf file has been saved with a newer version of " + std::string(SLIC3R_APP_NAME) + " and is not compatible."));
// throw version_error(msg.c_str());
@ -1699,20 +1701,19 @@ namespace Slic3r {
return false;
}
Slic3r::Geometry::Transformation transform;
if (m_version > 1)
Transform3d volume_matrix_to_object = Transform3d::Identity();
bool has_transform = false;
// extract the volume transformation from the volume's metadata, if present
for (const Metadata& metadata : volume_data.metadata)
{
// extract the volume transformation from the volume's metadata, if present
for (const Metadata& metadata : volume_data.metadata)
if (metadata.key == MATRIX_KEY)
{
if (metadata.key == MATRIX_KEY)
{
transform.set_from_string(metadata.value);
break;
}
volume_matrix_to_object = Slic3r::Geometry::transform3d_from_string(metadata.value);
has_transform = ! volume_matrix_to_object.isApprox(Transform3d::Identity(), 1e-10);
break;
}
}
Transform3d inv_matrix = transform.get_matrix().inverse();
Transform3d inv_matrix = volume_matrix_to_object.inverse();
// splits volume out of imported geometry
TriangleMesh triangle_mesh;
@ -1733,10 +1734,10 @@ namespace Slic3r {
{
unsigned int tri_id = geometry.triangles[src_start_id + ii + v] * 3;
Vec3f vertex(geometry.vertices[tri_id + 0], geometry.vertices[tri_id + 1], geometry.vertices[tri_id + 2]);
if (m_version > 1)
facet.vertex[v] = has_transform ?
// revert the vertices to the original mesh reference system
vertex = (inv_matrix * vertex.cast<double>()).cast<float>();
::memcpy(facet.vertex[v].data(), (const void*)vertex.data(), 3 * sizeof(float));
(inv_matrix * vertex.cast<double>()).cast<float>() :
vertex;
}
}
@ -1745,8 +1746,8 @@ namespace Slic3r {
ModelVolume* volume = object.add_volume(std::move(triangle_mesh));
// apply the volume matrix taken from the metadata, if present
if (m_version > 1)
volume->set_transformation(transform);
if (has_transform)
volume->set_transformation(Slic3r::Geometry::Transformation(volume_matrix_to_object));
volume->calculate_convex_hull();
// apply the remaining volume's metadata
@ -2471,6 +2472,9 @@ namespace Slic3r {
bool _3MF_Exporter::_add_model_config_file_to_archive(mz_zip_archive& archive, const Model& model, const IdToObjectDataMap &objects_data)
{
std::stringstream stream;
// Store mesh transformation in full precision, as the volumes are stored transformed and they need to be transformed back
// when loaded as accurately as possible.
stream << std::setprecision(std::numeric_limits<double>::max_digits10);
stream << "<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n";
stream << "<" << CONFIG_TAG << ">\n";