write_object_model_3d — Writes a 3D object model to a file.
write_object_model_3d writes the 3D object model
ObjectModel3D to the file
FileName. The object model
can be read again with
read_object_model_3d, or can be
imported into an appropriate CAD program. Please note, that primitives
may only be stored in the HALCON format 'om3'. Should it be
necessary to store the primitives in another format, the operator
sample_object_model_3d has to be called beforehand. However,
this results in a transformation of the primitives into 3D points and
therefore only corresponds to an approximation of the primitives.
All coordinates are written in meters. If the file is read later using
read_object_model_3d, the parameter Scale must be set to
'm' to avoid scaling the data.
FileType determines the type of the file. The
following types are supported by this operator:
HALCON format for object model 3D. Files with this format can be
The default file extension for this format is 'om3'.
AUTOCAD format. See
read_object_model_3d for details
about reading this file format.
The default file extension for this format is 'dxf'.
Object File Format. This is an ASCII-based format that can hold 3D points and polygons. The default file extension for this format is 'off'.
Polygon File Format (also Stanford Triangle Format). This is a simple format that can hold 3D points, point normals, polygons, color information and point-based extended attributes. HALCON supports the writing of both the ASCII and the binary version of this format. The default file extension for this format is 'ply'.
OBJ file format, also Wavefront OBJ-Format. This is an ASCII-based format that can hold 3D points, polygons, normals, and triangles, which are stored as polygons. The default file extension for this format is 'obj'.
STL file format, also 'Stereolithography format',
'SurfaceTesselationLanguage ', 'StandardTriangulationLanguage', and
This format stores triangles and triangle normals. However, as
triangle normals are not supported by HALCON 3D object models and
point normals (which are, for example, calculated by
surface_normals_object_model_3d) are not supported by the STL
format, no normals are written to file. If the 3D object model contains
polygons, they are converted to triangles before before writing them to
disc. If the file type is set to 'stl' or 'stl_binary',
the binary version of STL is written while 'stl_ascii' selects
the ASCII version. The default file extension for this format is 'stl'.
A set of additional optional parameters can be set. The names and values
of the parameters are passed in
GenParamValue, respectively. Some of the optional parameters
can only be set for a certain file type. The following values for
GenParamName are possible:
Invert normals and face orientation before saving the 3D object model. If this value is set to 'true', for the formats 'off', 'ply', 'obj', and 'stl' the orientation of faces (triangles and polygons) is inverted . For formats that support point normals ('ply','obj'), all normals are inverted before writing them to disc. Note that for the types 'om3' and 'dxf' the parameter has no effect.
List of values: 'true', 'false'.
Default value: 'false'.
Valid for formats: 'off', 'ply', 'obj', 'stl'.
Handle of the 3D object model.
Type of the file that is written.
Default value: 'om3'
List of values: 'dxf', 'obj', 'off', 'om3', 'ply', 'ply_binary', 'stl', 'stl_ascii', 'stl_binary'
Name of the file that is written.
File extension: .
Names of the generic parameters.
Default value: 
List of values: 'invert_normals'
→(string / real / integer)
Values of the generic parameters.
Default value: 
Suggested values: 'true', 'false'
write_object_model_3d returns the value
2 (H_MSG_TRUE) if the given parameters are correct and the file can be written.
If necessary, an exception will be raised.