Impostare le preferenze

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Il sistema delle preferenze di FreeCAD si trova nel menu Modifica → Preferenze.

Le funzionalità di FreeCAD sono suddivise in moduli separati, ciascun modulo si occupa della lavorazione in uno specifico Ambiente. FreeCAD utilizza il caricamento tardivo (late loading), questo significa che i componenti vengono caricati solo quando sono necessari. Come si può notare, un ambiente di lavoro con tutti i suoi componenti viene caricato solo al momento in cui l'ambiente viene selezionato nella barra degli strumenti di FreeCAD. Questo vale anche per le impostazioni delle preferenze (ndt le preferenze sono trattate come un componente dell'ambiente).

Senza alcun modulo caricato, si ha accesso a due sezioni di configurazione, responsabili delle impostazioni generali dell'applicazione e delle impostazioni della visualizzazione. Quando ci si trova in un certo ambiente, le preferenze di questo ambiente appaiono come nuove sezioni ed i formati di file supportati dall'ambiente sono visualizzati come nuova scheda nella sezione Importazione-Esportazione.

Facendo clic sul pulsante Reset nell'angolo in basso a sinistra di qualsiasi visualizzazione delle preferenze, tutte le preferenze di FreeCAD vengono reimpostate sui valori predefiniti.

Impostazioni generali

Questa sezione delle preferenze ha 6 schede:

Generale

Nella scheda Generale si può specificare quanto segue:

Nome	Descrizione
Cambia lingua	Seleziona la lingua dell'interfaccia utente di FreeCAD
Dimensione della lista dei file recenti	Specifica quanti file devono essere elencati nella lista dei file recenti
Abilita lo sfondo a mosaico	Se selezionato, lo sfondo della finestra principale di FreeCAD sarà composto per default da piastrelle di questa immagine: Questa opzione ha effetto solo se in Foglio di stile è selezionato Nessun foglio di stile. L'immagine può essere cambiata aggiungendo le cartelle Gui/Images nella cartella %APPDATA%/FreeCAD (su Windows), $HOME/.FreeCAD (su Linux) o $HOME/Library/Preferences/FreeCAD (su MacOS). Inserire un file chiamato background.png e disattivare o attivare questo opzione per vedere il file modificato.
Foglio di stile	Selezione di un foglio di stile. I fogli di stile definiscono l'aspetto dell'interfaccia utente di FreeCAD.
Dimensione dele icone della brra degli strumenti	Selezione della dimensione per le icone della barra degli strumenti
Modulo da caricare automaticamente dopo l'avvio	Selezione di quale ambiente verrà utilizzato direttamente dopo l'avvio di FreeCAD
Abilita la schermata iniziale all'avvio	Se selezionato, all'avvio viene visualizzata la schermata iniziale di FreeCAD. L'immagine della schermata iniziale può essere modificata aggiungendo le cartelle Gui/Images nella cartella %APPDATA%/FreeCAD (dove %APPDATA% è la cartella dell'applicazione specifica dell'utente di FreeCAD nel proprio sistema operativo). Inserire un file chiamato splash_image.png e riavviare FreeCAD per vedere la schermata iniziale modificata.
Abilita il ritorno a capo automatico	I testi vanno a capo automaticamente quando superano lo spazio orizzontale disponibile nella console Python. Questa console è visualizzabile usando il menu Visualizza → Pannelli → Console Python.

Documento

Nella scheda Documento si può specificare quanto segue:

Nome	Descrizione
Crea un nuovo documento all'avvio	Se selezionato, FreeCAD crea un nuovo documento quando viene avviato
Livello di compressione di salvataggio del documento	Specifica del livello di compressione per i file FCStd. I file FCStd sono file compressi ZIP. Quindi puoi rinominare il loro suffisso .FCStd in .zip e aprirli con un programma di archivio ZIP.
Utlizza Annulla/Ripristina sui documenti	Se selezionato, tutti i cambiamenti nei documenti sono memorizzati in modo che possano essere annullati o ripristinati
Massimo numero di passaggi Annulla/Ripristina	Specifica quanti passaggi Annulla/Ripristina devono essere registrati
Esegui il salvataggio automatico all'avvio	Se è disponibile un file di ripristino FreeCAD esegue automaticamente un ripristino del file all'avvio. In questo modo è possibile ripristinare i file in caso di arresto anomalo.
Salva le informazioni di autorecupero ogni	Specifica la frequenza con cui viene scritto un file di ripristino.
Salva la miniatura nel file del progetto al salvataggio del documento	Se selezionato, quando il documento viene salvato viene salvata anche una miniatura. Ad esempio, la miniatura viene visualizzata nell'elenco dei file recenti nell'ambiente Start.
Aggiungi il logo del programma alla miniatura generata	Se selezionato, il logo del programma FreeCAD viene aggiunto alla miniatura. Questa opzione ha effetto solo se viene usato Salva la miniatura nel file del progetto al salvataggio del documento.
Massimo numero di file di backup da conservare quando si salva nuovamente il documento	Se selezionato, i file di backup vengono conservati quando si salva il documento. È possibile specificare il numero di file di backup da conservare. Contengono la versione del documento salvata in precedenza. Il primo file di backup ha il suffisso del file .FCStd1, il secondo .FCStd2 e così via.
Consenti la duplicazione delleetichette degli oggetti nello stesso documento	Se selezionato, gli oggetti possono avere la stessa etichetta o nome. Ad esempio, parti o caratteristiche diverse possono avere lo stesso nome nello stesso documento.
Nome autore	Tutti i documenti che vengono creati ottengono il nome dell'autore specificato. Lasciare il campo dell'autore vuoto per un autore anonimo. Se viene selezionata l'opzione Imposta su salva, il campo Ultima modifica effettuata da: sarà impostato sull'autore specificato al momento del salvataggio del file. Questo campo può essere visualizzato utilizzando il menu File → Informazioni sul progetto.
Azienda	Tutti i documenti creati ottengono il nome della società specificata
Licenza di default	Selezione di una licenza predefinita per nuovi documenti. Per la licenza predefinita, URL della licenza viene automaticamente impostato di conseguenza. Selezionare 'Altro' per una licenza propria o speciale.
URL della licenza	Specifica un URL che descrive la licenza selezionata in Licenza di default

Editore

Le impostazioni delle preferenze dell'editor influiscono sul comportamento dell'editor delle macro. Questo editor può essere aperto usando il menu Macro → Macros... → Modifica/Crea.
Nota: le impostazioni di colore e carattere influenzano anche la console Python. Questa console viene mostrata usando il menu Visualizza → Pannelli → Console Python.

In the Editor tab you can specify the following:

Name	Description
Display Items	Selection of the code type. The color and font settings will be applied to the selected type. The result can be seen in the Preview field.
Family	Specification of the font family that should be used for the selected code type
Size	Specification of the font size that should be used for the selected code type
Enable line numbers	If checked, the code lines will be numbered
Tab size	Specification of the tabulator raster (how many spaces). If it is for example set to '6', pressing Tab will jump to character 7 or 13 or 19 etc., depending the current cursor position. This setting is only used if Keep tabs is selected.
Indent size	Specification of how many spaces will be inserted when pressing Tab. This setting is only used if Insert spaces is selected.
Keep tabs	If selected, pressing Tab will insert a tabulator with the raster defined by Tab size
Insert spaces	If selected, pressing Tab will insert the amount of spaces defined by Indent size

Finestra di output

In the Output tab you can specify the following:

Name	Description
Record log messages	If checked, also log messages will be recorded. They will be output in the Report view panel with the color set in Log messages. This panel is shown using the menu View → Panels → Report view.
Record warnings	If checked, warnings will be recorded. They will be output in the Report view panel with the color set in Warnings.
Record error messages	If checked, error messages will be recorded. They will be output in the Report view panel with the color set in Errors
Normal messages	Specification of the font color for normal messages in the Report view panel.
Log messages	Specification of the font color for log messages in the Report view panel.
Warnings	Specification of the font color for warning messages in the Report view panel.
Errors	Specification of the font color for error messages in the Report view panel.
Redirect internal Python output to report view	If checked, internal Python output will be redirected from the Python console to the Report view panel. The Python console is shown using the menu View → Panels → Python console
Redirect internal Python errors to report view	If checked, Python error messages will be redirected from the Python console to the Report view panel.

Macro

In the Macro tab you can specify the following:

Name	Description
Run macros in local environment	If checked, variables defined by macros are created as local variables, otherwise as global Python variable
Macro path	Specification of a path to macro files
Recording GUI commands	If checked, recorded macros will also contain user interface commands
Record as comment	If checked, recorded macros will also contain user interface commands but as comments. This is useful if you don't want to execute visible actions when running the macro but to see what could be done visibly.
Show script commands in python console	If checked, the commands executed by the macro scripts are shown in the Python console. This console is shown using the menu View → Panels → Python console.

Unità

In the Units tab you can specify the following:

Name	Description
User system	Selection of a unit system that should be used for all parts of FreeCAD
Number of decimals	The number of decimals that should be shown for numbers and dimensions in FreeCAD
Minimum fractional inch	Minimum fractional inch that should be displayed. This setting is only available if the unit system Building US (ft-in/sqft/cuft) is used.

Impostazioni di visualizzazione

Questa sezione delle preferenze ha 3 schede:

Vista 3D

In the 3D View tab you can specify the following:

Name	Description
Show coordinate system in the corner	If checked, the main coordinate system will always be shown at the lower right in opened files
Show counter of frames per second	If checked, the time needed for the last operation and the resulting frame rate will always be shown at the lower left in opened files
Show navigation cube	If checked, the navigation cube will always be shown at the selected Corner in opened files
Use OpenGL Vertex Buffer Object	If checked, Vertex Buffer Objects (VBO) will be used. A VBO is an OpenGL feature that provides methods for uploading vertex data (position, normal vector, color, etc.) to the video device. VBOs offer substantial performance gains because the data resides in the video device memory rather than the system memory and so it can be rendered directly by the video device. For more background info see this webpage.
Enable animation	If checked, rotations can be animated. If for example the 3D Navigation set CAD is used and the mouse is moved while the scroll wheel and the right mouse button is pressed, parts are rotated. If one keeps the mouse moving while releasing e.g. the right mouse button, the rotation will continue as animation. To end the animation left-click with the mouse.
3D Navigation	Selection of a navigation settings set. To see what each set defines, select a set and press the button Mouse....
Orbit style	Selection of the rotation orbit style. When viewing a part in the x-y plane an being in the rotation mode of the 3D navigation, the difference is: If Trackball is selected, moving the mouse horizontally will rotate the part around the y-axis, if Turntable is selected the part will be rotated around the z-axis.
Anti-Aliasing	Selection if and what kind of Multisample anti-aliasing is used
New Document Camera Orientation	Selection of the camera orientation for new documents
Zoom at cursor	If checked, zoom operations will be performed at the position of the mouse pointer. Otherwise zoom operations will be performed at the center of the current view. The Zoom step defines how much will be zoomed. A zoom step of '1' means a factor of 7.5 for every zoom step.
Invert zoom	If checked, the direction of zoom operations will be inverted.
Disable touchscreen tilt gesture	If checked, the tilting gesture will be disabled for pinch-zooming (two-finger zooming). This only affects the 3D Navigation set Gesture.
Drag at cursor	If checked, rotations in 3D will use the current cursor position as center for the rotation. Otherwise always the center of the screen will be used.
Marker size	Selection of the size of vertices (points) in the Sketcher workbench
Eye to eye distance for stereo modes	Specification of the eye-to-eye distance used for stereo projections. The specified value is a factor that will be multiplied with the bounding box size of the 3D object that is currently displayed.
Enable backlight color	If checked, backlight is enabled with the defined color
Intensity of backlight	Specification of the intensity of the backlight. This setting is only enabled if Enable backlight color is checked.
Camera type	Selection of the camera projection type. If Perspective rendering is selected, objects will appear in a perspective projection. If Orthographic rendering is selected, objects will be projected in orthographic projection.

Colori

In the Colors tab you can specify the following:

Name	Description
Enable preselection highlighting	If checked, preselection is turned on and will be highlighted by the specified color. Preselection means that for example edges in parts will be highlighted while hovering with the mouse over them to indicate that they can be selected.
Enable selection highlighting	If checked, selection highlighting is turned on and the specified color will be used for it
Pick radius	Sets the area of confusion for picking elements in 3D view. Larger value makes it easier to pick stuff, but will make some small features impossible to select.
Simple color	If selected, the background for parts will have the selected color
Color gradient	If selected, the background for parts will have the selected color gradient
Middle color	Is only enabled if Color gradient is selected. If checked, the color gradient will get the selected color as middle color.
Object being edited	Selection of the background color for objects in the tree view that are currently edited
Active container	Selection of the background color for active containers in the tree view. For example if there are several parts in the tree view and one part is toggled as active body, it will get the selected background color in the tree view.

Colori della parte

Questa scheda viene mostrata solo se ci si trova nell'ambiente Part o PartDesign o se si è già stati prima in questi ambienti di lavoro.

In the Part colors tab you can specify the following:

Name	Description
Default shape color	Selection of the default color for new shapes. If the option Random shape color is set, a random color is used instead.
Default line color	Selection of the default line color for new shapes
Default line width	Specification of the default line thickness for new shapes
Default vertex color	Selection of the default color for new vertices
Default vertex size	Specification of the default size for new vertices
Bounding box color	Selection of the color of bounding boxes in the 3D view
Default text color	Selection of the default text color for document annotations. There is currently no dialog to add annotations to documents. Annotations can only be added using the Python console with this command: obj=App.ActiveDocument.addObject("App::Annotation","Label") This console is shown using the menu View → Panels → Python console.

Impostazioni di importazione e esportazione

Le impostazioni di Import-Export influenzano il modo in cui i file vengono importati ed esportati in e da FreeCAD. Si noti che la finestra di dialogo delle preferenze di importazione e esportazione offre le impostazioni del tipo di file per la maggior parte dei workbench ma non tutti gli ambienti di lavoro sono in grado di importare e esportare tutti i tipi di file.

FreeCAD supporta molti formati di file. Per i seguenti formati di file offre l'applicazione di impostazioni speciali:

DAE

The Collada DAE (Digital Asset Exchange) format is a standard file format for exchange of Mesh data. The Arch workbench can import meshes from .dae files, and export Arch and other Shape-based objects to the .dae format. The Collada import functionality in the Arch module depends on pycollada. If it is not installed on your system, Collada import/export will be disabled.

For the DAE format you can specify the following:

Name	Description
Scaling factor	All dimensions in the file will be scaled with the specified factor
Mesher	Sets the meshing program that should be used. If using Netgen, make sure that it is available. This can be checked by using the Mesh module and creating a mesh using Netgen. If it is not available another version of FreeCAD, compiled with Netgen, must be installed.
Tessellation	The tessellation value to use with the Builtin and the Mefisto meshing program.
Grading	The grading value to use for meshing using Netgen. This value describes how fast the mesh size decreases. The gradient of the local mesh size h(x) is bounded by \|Δh(x)\| ≤ 1/value.
Segments per edge	The maximum number of segments per edge
Segments per radius	The number of segments per radius
Second order	Allow a second order mesh
Optimize	Allows optimization
Allow quads	Allow quadrilateral faces

DWG

DWG (from drawing) is a proprietary binary file format used for storing two- and three- dimensional design data and metadata. Since it is a closed source file format it cannot be directly supported by FreeCAD. Therefore the external file converter ODA is required.

For the DWG format you can only specify the path to ODA. note: All settings for DXF file format also apply to DWG.

Name	Description
Path to ODA (formerly Teigha) File Converter	Sets the path to the ODA file converter

DXF

AutoCAD DXF (Drawing eXchange Format) is a proprietary format to exchange CAD data between AutoCAD and other programs.

For the DXF format you can specify the following:

Name	Description
Show this dialog when importing and exporting	This preferences dialog will be shown when importing or exporting DXF files
Use legacy python importer	If checked, the Python importer is used, otherwise the newer C++ one. The C++ importer is faster, but has not as many features yet.
Allow FreeCAD to automatically download and update the DXF libraries	By checking this, you will allow FreeCAD to download the Python converter for DXF import and export. This converter cannot be bundled with FreeCAD because it has a different software license.
Import	Select what will be imported. If texts and dimensions is unchecked, texts and mtexts won't be imported. If layouts is checked, paper space objects will be imported too. Check blocks if you want the non-named blocks (beginning with a ) to be imported too.
Create	Select what will be created. If simple Part shapes is selected, only standard Part objects will be created. This is the fastest. If Draft objects is selected, parametric Draft objects will be created whenever possible. If Sketches is selected, sketches will be created whenever possible.
Scale factor to apply to imported files	Scale factor to apply to DXF files on import. The factor is the conversion between the unit of your DXF file and millimeters. Example: for files in millimeters: 1, in centimeters: 10, in meters: 1000, in inches: 25.4, in feet: 304.8
Get original colors from the DXF file	If checked, colors will be retrieved from the DXF objects whenever possible. Otherwise default colors will be applied.
Join geometry	If checked, FreeCAD will try to join coincident objects into wires. Note that this can take a while.
Group layers into blocks	If checked, objects from the same layers will be joined into Draft Blocks, turning the display faster, but making them less easily editable ??The Draft Wiki pages don't mention Draft blocks??
Use standard font size for texts	If checked, imported texts will get the standard Draft Text size, instead of the size they have in the DXF document
Use VisGroups	If checked, DXF layers will be imported as Draft VisGroups
Import hatch boundaries as wires	If checked, hatches will be converted into simple wires
Render polylines with width	If checked, when polylines have a width defined, they will be rendered as closed wires with the correct width
Treat ellipses and splines as polylines	The export of ellipses and splines is poorly supported. ??Still the case?? Use this option to export them as polylines instead. The setting Max Spline Segment is then the maximum length of each of the polyline segments. If it is set to '0' the whole spline is treated as a straight segment.
Export 3D objects as polyface meshes	If checked, all objects containing faces will be exported as 3D polyfaces
Export Drawing Views as blocks	If this is checked, Drawing Views will be exported as blocks. This might fail for post DXF R12 templates.
Project exported objects along current view direction	If checked, the exported objects will be projected to reflect the current view direction

IGES

The Initial Graphics Exchange Specification (IGES) file format is a file format that allows the digital exchange of information among CAD systems. Since the specification for the STEP file format was published, the development of IGES was stopped in 1996. It is nevertheless still supported by many CAD programs.

The tab IGES is only shown in the preferences if you are in the Part or PartDesign workbench or if you have been in these workbenches before.
For the IGES format you can specify the following:

Name	Description
Units for export of IGES	Selection what unit will be used when exporting IGES files
Write solids and shells as	Selection how solids and shells should be output. If Groups of Trimmed Surfaces (type 144) is selected, they will be exported as trimmed surface. If Solids (type 186) and Shells (type 514) / B-REP mode is selected, solids will be exported as manifold solid B-Rep object, shells as shell.
Skip blank entities	If checked, blank entities will not be imported
Company	If not empty, the entered text will be used in the IGES file header for the company
Author	If not empty, the entered text will be used in the IGES file header for the author
Product	If not empty, the entered text will be used in the IGES file header for the product

IFC

Industry Foundation Classes (IFC) is a wide spread format to interchange data between BIM applications, used in architecture and engineering.

For the IFC format you can specify the following:

Name	Description
Show debug messages	Shows verbose debug messages during import and export of IFC files in the Report view panel
Create clones when objects have shared geometry	IFC objects can share a same geometry definition between several objects, only their placement is different. So when this option is enabled, clones are used to achieve the same result in FreeCAD. One object is the base object, the others are clones.
Import arch IFC objects as	What will be created in FreeCAD for arch IFC objects
Import struct IFC objects as	What will be created in FreeCAD for struct IFC objects
Root element	Only subtypes of the specified element will be imported. Keep the predefied element IfcProduct to import all building elements.
Separate openings	If checked, openings will be imported as subtractions, otherwise wall shapes will already have their openings subtracted
Detect extrusions	If checked, the importer will try to detect extrusions. Note that this might slow things down.
Split multilayer walls	Split walls made of multiple layers
Prefix names with ID number	If checked, object names will be prefixed with the IFC ID number
Merge materials with same name	If several materials with the same name are found in the IFC file, they will be treated as one.
Import Ifc Properties in spreadsheet	If checked, each object will have their IFC properties stored in a spreadsheet object.
Exclude list	A comma-separated list of IFC entities to be excluded from imports
Fit view while importing	Fit view during import on the imported objects. This will slow down the import, but one can watch the import.
Force export as Brep	Some IFC viewers don't like objects exported as extrusions. Use this to force all objects to be exported as BREP geometry.
Use DAE triangulation options	Use triangulation options set in the DAE options page
Join coplanar facets when triangulating	Curved shapes that cannot be represented as curves in IFC are decomposed into flat facets. If this is checked, some additional calculation is done to join coplanar facets.
Store IFC universal ID in FreeCAD objects	When exporting objects without universal ID (UID), the generated UID will be stored inside the FreeCAD object for reuse next time that object is exported. This leads to smaller differences between file versions.
Use IfcOpenShell serializer if available	IFCOpenShell is a library that allows to import IFC files. Its serializer functionality allows to give it an OCC shape and it will produce an adequate IFC geometry: NURBS, faceted, or anything else. Note that the serializer this is still an experimental feature.
Export 2D objects as IfcAnnotations	If checked, 2D objects will be exported as IfcAnnotation
Export full FreeCAD parametric model	If checked, all FreeCAD object properties will be stored inside the exported objects, allowing to recreate a full parametric model on reimport.
Reuse similar entities	If checked, similar entities will be used only once in the file if possible. This can reduce the file size a lot, but will make it less easily readable by humans.
Disable IfcRectangleProfileDef	When possible, IFC objects that are extruded rectangles are exported as IfcRectangleProfileDef. However, some other applications have problems importing that entity. If this is your case, you can disable this and then all profiles will be exported as IfcArbitraryClosedProfileDef.

INP

INP is the input file format for the FEM software Abaqus. It is used for the solver CalculiX in the FEM workbench.

The tab Abaqus INP is only shown in the preferences if you are or if you have been in the FEM workbench before.
For the INP format you can specify the following:

Name	Description
Which mesh elements to export	Selection what mesh element parameters should be exported. If All is selected, all elements will be exported. If Highest is selected, only the highest elements will be exported. This means for means volumes for a volume mesh and faces for a shell mesh. If FEM is selected, only FEM elements will be exported. This means only edges not belonging to faces and faces not belonging to volumes.
Export group data	If checked, mesh groups are exported too. Every constraint and, if there are different materials, material consists of two mesh groups, faces and nodes where the constraint or material is applied.

Formati Mesh

Meshes are a special type of 3D object, composed of triangular faces connected by their vertices and edges. They are widely used for additive manufacturing. The FreeCAD provides the Mesh workbench to create and handle meshes. FreeCAD supports the file formats AMF and its predecessor STL, OBJ, OFF, PLY and SMF.

The tab Mesh formats is only shown in the preferences if you are in the Mesh workbench or if you have been in this workbench before.
For the Mesh formats you can specify the following:

Name	Description
Maximum mesh deviation	Specification of the maximal deviation between the mesh and the object
Export AMF files using compression	If checked, ZIP compression is used when writing a mesh file in AMF format

OCA

The OCA file format is a community project to create a free, simple and open CAD file format. OCA is largely based on the GCAD file format generated by gCAD3D. Both formats can be imported in FreeCAD and the OCA files exported by FreeCAD can be opened in gCAD3D.

For the OCA format you can specify the following:

Name	Description
Import OCA areas	If checked, the areas (3D faces) will be imported too

STEP

The standard for the exchange of product model data (STEP) file format is an ISO standard for the computer-interpretable representation and exchange of product manufacturing information. STEP is therefore commonly used to exchange 3D data between CAD software. STEP files have the suffix .step or sometimes .stp.

The tab STEP is only shown in the preferences if you are in the Part or PartDesign workbench or if you have been in these workbenches before.
For the STEP format you can specify the following:

Name	Description
Units for export of STEP	Selection what unit will be used when exporting STEP files
Write out curves in parametric space of surface	If checked, parametric curves (curves in parametric space of surface) will be written into the STEP file. Unchecking the option can be helpful to minimize the size of the resulting STEP file.
Scheme	Selection what STEP application protocol (AP) will be used for the export. AP 203 is the protocol for configuration controlled 3D designs of mechanical parts and assemblies. AP 204 is the protocol for core data for automotive mechanical design processes.
Enable STEP Compound merge	If checked, a compound merge will be done during file reading. This is slower but results in higher details.
Company	If not empty, the entered text will be used in the STEP file header for the company
Author	If not empty, the entered text will be used in the STEP file header for the author
Product	If not empty, the entered text will be used in the STEP file header for the product

SVG

Scalable Vector Graphics (SVG) is a vector image format for two-dimensional graphics. The vectors make SVG are very useful for technical drawing programs like FreeCAD's TechDraw because a vector image can be scaled to any size without losing its shape or amount of details. SVG can be scaled to any required resolution and converted to bitmap formats like PNG or JPEG for printing.

For the SVG format you can specify the following:

Name	Description
Import style	Selection how SVG object colors and line widths will be imported. If None (fastest) is selected no color and line width settings will be imported. If Use default color and linewidth is selected FreeCAD will use its default color and line width. If Original color and linewidth is selected FreeCAD will use the color and linewidth from the SVG objects.
Disable units scaling	If checked, no units conversion will occur. One unit in the SVG file will translate as one millimeter.
Export style	Selection how Sketches are exported to SVG. If Translated (for print & display) is selected, SVG objects are encapsulated in a group that is scaled and moved to the correct place in the SVG document to fit into a printable area. If Raw (for CAM) is selected, SVG objects are placed as they are - at the same coordinates as in the FreeCAD model (1:1 export).
Translate white line color to black	If checked, all white lines will appear in black in the SVG for better readability against white backgrounds
Max segment length for discretized arcs	Older versions of Open CASCADE than version 6.8 don't support arc projection. In this case arcs will be discretized into small line segments. This value is the maximum segment length.

VTK

The Visualization Toolkit (VTK) is an open-source, freely available software system for 3D computer graphics, image processing and visualization. VTK files are used by the FEM workbench for the post processing of simulation results.

The tab VTK is only shown in the preferences if you are or if you have been in the FEM workbench before.
For the VTK format you can specify the following:

Name	Description
Which object to import into	Selection what objects should be imported. If VTK result object is selected, a FreeCAD FEM VTK result object will be imported (equals to the object which was exported). If FEM mesh object is selected, the results in the VTK file will be omitted, only the mesh data will be imported and a FreeCAD FEM mesh object will be created. If FreeCAD result object is selected, the imported data will be converted into a FreeCAD FEM Result object. Note: this setting needs the exact result component names and thus it only works properly with VTK files exported from FreeCAD.