SMOOTH


ID_NAME	= <`id_name`>	Unique ID name of the `SMOOTH` block, which is also used as the default output file name base.
TASK		Determines the task type.
	= ISO	Isosurface of a topology optimization result.
	= SURFACE	Surface of the result of a shape or bead optimization.
	= SURFACE_INITIAL	Surface of the initial model of a shape or bead optimization.
	= ALL_ITERATIONS	Isosurfaces for each iteration of topology optimization.
DATABASE	= <`opt_res_database`>	Name of the results-database to read from. The typical name is `opt_res_database`. If this parameter is provided, the parameters `MODEL`, `RESULT`, and `GROUP_FILE` are not allowed.
DESIGN_CYCLE	= ALL = LAST = <`value`>	Design-cycle to select the results for it from the results-database. Can be one of `ALL`, `LAST`, or a single numeric value specifying a design cycle. This parameter is taken into account only if the `DATABASE` parameter is in use.
MODEL	= <`ONF_file_name`>	Name of the ONF model file. This parameter is not allowed when a `DATABASE`-name is given.
RESULT	= <`ONF_result_file_name`>	ONF results file name containing the material distribution (for topology optimization with `TASK = iso` or `all_iterations`) or the optimization displacement (for bead or shape optimization). This parameter is not allowed when a `DATABASE-name` is given.
OUTPUT_FILE	= <`file_name_base`> = <value_of_id_name_parameter>	Base for the output file name.
ISO_VALUE	= <`value`> = 0.3	Isovalue; is used to determine the positions on the element edges where the new nodes are created. Larger values lead to models with smaller volume. Not used if `TASK = surface`. Value between 0 and 1.
SMOOTH_CYCLES	= <`value`> = 5	Number of smoothing cycles: if set to 0, no smoothing is performed. Larger values lead to smoother models, but might cause the narrowing of thin components. Not used if `TASK = surface`. Nonnegative integer value.
SHRINKAGE_CORRECTION	= YES = NO	Reduce the shrinkage effects caused by the Laplacian smoothing.
REDUCTION_RATE	= <`value`> = 0	Defines the percent of faces that should be removed during the data reduction: if set to 0, no data reduction occurs. If set to 100, the data reduction stops when no faces can be removed (that is checked using the `REDUCTION_ANGLE` parameter). Real value between 0 and 100.
REDUCTION_ANGLE	= <`value`> = 15	Defines the maximal angle between adjacent faces at a node such that the node might be removed during the data reduction. Real value in degrees between 0 and 90.
SELF_INTERSECTION_CHECK		Defines if the self-intersection checks are to be performed during the isocut, smoothing, and data reduction.
	= OFF	No checks.
	= CHECK	Check once.
	= RUNTIME	Check always.
	= ITERATIVE	First run without check, then rerun if self-intersections are found.
MIN_ANGLE	= <`value`> = 15	Defines the minimal angle of the triangles that result from the smoothing and data reduction. Triangles with smaller angles might be present if they are created during the isocut. Too large value might prevent the smoothing, too small value might lead to degenerated triangles. Real value in degrees between 0 and 90.
MIXED_MESH	= YES = NO	If set to `YES`, then the quadrilaterals are formed from adjacent triangles; applies to VTFX, ONF, and IGES output formats only.
FORMAT	See the section below	Output file format; one or more `FORMAT` entries can be specified. In case that the isosurfaces for all iterations are calculated, one file for each iteration in each mentioned format (except VTFX) is saved. In addition, a VTFX file containing the isosurfaces for all iterations is generated.
OUTPUT_SURFACE	= ORIGINAL = NEW = BOTH	Specifies what should be saved to the output files: the original surface (`ORIGINAL`), the surface generated by isocut (`NEW`), or the complete surface (`BOTH`). The parameter has no influence for shell element models, and is ignored for the generation of slices.
INVERT_SURFACE	= YES = NO	Show only the removed parts instead of the plain results if set to `YES`.
ORIGINAL_SURFACE_TOLERANCE	= 0.0,REL = 0.0,ABS	Add an offset to nodes on the original surface (3D only). This can either be done in absolute values (`ABS`) or relative to the element size (`REL`).
VTF_ORIGINAL_MODEL	= YES = NO	If set to `YES`, the original FEM model will be saved to the VTFX output file in addition to the (iso)surface.
APPEND_TO_VTFX	= YES = NO	Appends report to file specified with parameter `OUTPUT_FILE`.
IGES_UNIT	= IN (inches) = MM (millimeters) = FT (feet) = MI (miles) = M (meters) = KM (kilometers) = MIL (mils) = UM (microns) = CM (centimeters) = UIN (microinches)	Unit used for output in IGES format.Note that the same unit is used in the case that the slices are generated and saved in IGES format.
SLICE_NUMBER	= <`value`> = 0	Number of parallel section planes that define the slices. If set to 0, no slices are saved. Only used for solid models. Nonnegative integer value.
SLICE_NORMAL	= <`x_coord`>, <`y_coord`>,<`z_coord`> = 0,1,0	Normal to the section planes. The real values `x`, `y`, `z` that are not all equal to zero should be separated by commas; spaces before or after the commas are allowed.
SLICE_FORMAT
	= IGS_POLYGON	Save slices as polygons using cubic parametric splines for each segment (IGES block 112). File name: `<name>_slices.igs`.
	= IGS_CURVES	Save slices as curves obtained by interpolation using uniform cubic splines (IGES block 126). File name: <`name>_slices_ipl.igs`.
	= CLI	Save slices as polygons saved in common layer interface format. File name: `<name>_slices.cli`.
	= ALL	Save slices in all formats mentioned above.
BORDER	= YES = NO	If set to `YES`, the border of the shell element model will be saved according to the format defined by the `SLICE_FORMAT` parameter; the file name is the same as for slice output, with ’slices’ replaced with ’border.’ Only used for shell element models.
GROUP_FILE	= <`ONF_group_file_name`>	Name of the ONF file containing the groups. This parameter is not allowed when a `DATABASE`-name is given.
GROUP_EXCLUDE	= <`group_name`>	The elements of the group are ignored for all operations.
GROUP_INCLUDE	= <`group_name`>	The elements of the group are marked as normal and are used for the (iso)surface calculation.
GROUP_SURFACE	= <`group_name`>	The surface of the elements in the group will be calculated even if they would be deleted or cut otherwise.
ND_GROUP	= <`node_group_name`>	Remove elements from the smooth output that contain nodes not present in the specified node group.
TARGET_VOLUME	= <`value`> = 0	Defines the target volume that is to be achieved iteratively by varying the isovalue. If set to 0, the given isovalue is used for the generation of the isosurface. Not used if `TASK = surface`. Real value between 0 and 1.
ISO_VALUE_GROUP	= <`group`>,<`value`>	Defines the isovalue for a given group. Not used if `TASK = surface`. Value is between 0 and 1.
TARGET_VOLUME_GROUP	= <`group`>,<`value`>	Defines the target volume for a given group. Not used if `TASK = surface`. Value is between 0 and 1.
ISO_SEQUENCE		Only used if `TASK = all_iterations`.
	= CONST	Use the same isovalue for each iteration.
	= INCR	Use linearly increasing isovalues.
	= NO	The entire model is used for smoothing.
	= YES	The loaded elements will be removed from the smoothed result. Only available if `<jobname>_fem.onf` file is used as the input model file.
ORIGINAL_SURFACE_SMOOTHING		Defines if the original surface is to be smoothed or remain unchanged.
	= OFF	No changes to the original surface.
	= SHRINK	Allows its nodes to be moved toward the inside only.
	= FULL	Allows any modifications of the original surface.
RESULT_FILTERING	= OFF = MODERATE = FULL	Defines if the element material values are to be filtered (averaged locally) before the isocut, and to what extent.
KEEP_CONNECTION_NODES	= YES = NO	Keep nodes on the border toward an excluded area
KEEP_LOADED_ELEMENTS	= NO = YES	Keep loaded elements (gravity, accelerations, pressure loads)
COMPONENT_LIMITING_SIZE	= <`value`> = 0	Defines the minimal allowed relative size of a connected component (calculated using its number of faces). All components with the relative size below this value are removed.

Options for FORMAT parameter


Formats for transfer to post-processing
Program	`FORMAT` parameter	File name, comments
Abaqus/CAE	inp iges3	<`name`>.inp <`name`>_3.igs (IGES using block 128)
ANSYS®	cdb iges3	<`name`>.cdb <`name`>_3.igs (IGES using block 128)
CATIA	stl iges3	<`name`>.stl (STL recommended as design draft) <`name`>_3.igs (IGES using block 128)
GLView Inova	vtfx	<`name`>.vtfx
MSC Nastran®	bdf	<`name`>.bdf
Patran	out	<`name`>.out (Patran neutral format)
Pro/E	iges1	<`name`>.igs (IGES using block 114)
Rapid Prototyping applications	stl	<`name`>.stl
Solid Works	iges2	<`name`>_2.igs (IGES with explicit point information)
Tosca Structure.view	vtfx	<`name`>.vtfx
Graphic (animation) programs	obj	<`name`>.obj (Wavefront .obj file for 3D model exchange)
Other pre/post-processors	See above	Use `out`, `inp`, `bdf`, `cdb`; see above for file names.

Remarks

The parameter file might contain any number of SMOOTH blocks. To avoid having the output files be overwritten, different values of OUTPUT_FILE parameter for each SMOOTH block should be used, in case that this parameter is defined. If OUTPUT_FILE parameter is omitted, the value of ID_NAME parameter (that should be unique) is used and the files do not get overwritten.
If the TARGET_VOLUME parameter is set to a nonzero value, the ISO_VALUE parameter is ignored. In this case, the calculations will only result in an isosurface if the relative volume can be attained for some isovalue between 0 and 1. Moreover, for some models, the dependence of the relative volume on the isovalue has "jumps," therefore a certain target volume cannot be attained even if it lies between the minimal and maximal relative volumes. If this happens, it is recommended to choose another target relative volume, or run the calculation with a fixed isovalue instead.
Group name "all" representing all elements of the model can be used alongside actual group names loaded from an ONF group file. Group names are case-insensitive.
APPEND_TO_VTFX allows to combine reports with several smooth results into one vtfx archive. Note, if APPEND_TO_VTFX=NO and the file specified with parameter OUTPUT_FILE exists, it is overwritten. Otherwise a new file is created.