Command line options

F3D behavior can be fully controlled from the command line using the following options.

Applicative Options

Options Default Description
--output=<png file>   Instead of showing a render view and render into it, render directly into a png file. When used with --ref option, only outputs on failure.
--no-background   Use with --output to output a png file with a transparent background.
-h, --help   Print help and exit. Ignore --verbose.
--version   Show version information and exit. Ignore --verbose.
--readers-list   List available readers and exit. Ignore --verbose.
--config=<config file path/name/stem> config Specify the configuration file to use. Supports absolute/relative path but also filename/filestem to search for in standard configuration file locations.
--dry-run   Do not read any configuration file and consider only the command line options.
--no-render   Do not render anything and quit just after loading the first file, use with --verbose to recover information about a file.
--max-size=<size in MiB> -1 Prevent F3D to load a file bigger than the provided size in Mib, negative value means unlimited, useful for thumbnails.
--load-plugins=<paths or names>   List of plugins to load separated with a comma. Official plugins are alembic, assimp, draco, exodus, occt, usd, vdb. See usage for more info.

General Options

Options Default Description
--verbose=<[debug|info|warning|error|quiet]> info Set verbose level, in order to provide more information about the loaded data in the console output. If no level is providen, assume debug. Option parsing may ignore this flag.
--progress   Show a progress bar when loading the file.
--geometry-only   For certain full scene file formats (gltf/glb and obj),
reads only the geometry from the file and use default scene construction instead.
--group-geometries   When opening multiple files, show them all in the same scene.
Force geometry-only. The configuration file for the first file will be loaded.
--up=<[+|-][X|Y|Z]> +Y Define the Up direction.
-x, --axis   Show axes as a trihedron in the scene.
-g, --grid   Show a grid aligned with the horizontal (orthogonal to the Up direction) plane.
--grid-unit=<length>   Set the size of the unit square for the grid. If set to non-positive (the default) a suitable value will be automatically computed.
--grid-subdivisions=<count>   Set the number of subdivisions for the grid.
-e, --edges   Show the cell edges.
--camera-index=<idx> -1 Select the scene camera to use when available in the file.
Any negative value means automatic camera.
The default scene always uses automatic camera.
-k, --trackball   Enable trackball interaction.
--animation-autoplay   Automatically start animation.
--animation-index=<idx> 0 Select the animation to show.
Any negative value means all animations (glTF only).
The default scene always has at most one animation.
--animation-speed-factor=<factor> 1 Set the animation speed factor to slow, speed up or even invert animation time.
--animation-frame-rate=<factor> 60 Set the animation frame rate used when playing animation interactively.
--font-file=<font file>   Use the provided FreeType compatible font file to display text.
Can be useful to display non-ASCII filenames.

Material options

Options Default Description  
-o, --point-sprites   Show sphere points sprites instead of the geometry.  
--point-size=<size> 10.0 Set the size of points when showing vertices and point sprites.  
--point-type=<sphere gaussian> sphere Set the splat type when showing point sprites.
--line-width=<size> 1.0 Set the width of lines when showing edges.  
--color=<R,G,B> 1.0, 1.0, 1.0 Set a color on the geometry. Multiplied with the base color texture when present.
Requires a default scene.
 
--opacity=<opacity> 1.0 Set opacity on the geometry. Multiplied with the base color texture when present.
Requires a default scene. Usually used with Depth Peeling option.
 
--roughness=<roughness> 0.3 Set the roughness coefficient on the geometry (0.0-1.0). Multiplied with the material texture when present.
Requires a default scene.
 
--metallic=<metallic> 0.0 Set the metallic coefficient on the geometry (0.0-1.0). Multiplied with the material texture when present.
Requires a default scene.
 
--hdri-file=<HDRI file>   Set the HDRI image that can be used as ambient lighting and skybox.
Valid file format are hdr, exr, png, jpg, pnm, tiff, bmp.
If not set, a default is provided.
 
--hdri-ambient   Light the scene using the HDRI image as ambient lighting.
The environment act as a light source and is reflected on the material.
 
--texture-matcap=<texture file>   Set the texture file to control the material capture of the object. All other model options for surfaces are ignored if this is set. Must be in linear color space.  
--texture-base-color=<texture file>   Set the texture file to control the color of the object. Please note this will be multiplied with the color and opacity options. Must be in sRGB color space.  
--texture-material=<texture file>   Set the texture file to control the occlusion, roughness and metallic values of the object. Please note this will be multiplied with the roughness and metallic options, which have impactful default values. To obtain true results, use --roughness=1 --metallic=1. Must be in linear color space.  
--texture-emissive=<texture file>   Set the texture file to control the emitted light of the object. Please note this will be multiplied with the emissive factor. Must be in sRGB color space.  
--emissive-factor=<R,G,B> 1.0, 1.0, 1.0 Set the emissive factor. This value is multiplied with the emissive color when an emissive texture is present.  

Window options

Options Default Description
--bg-color=<R,G,B> 0.2, 0.2, 0.2 Set the window background color.
Ignored if hdri is set.
--resolution=<width,height> 1000, 600 Set the window resolution.
--position=<x,y>   Set the window position (top left corner) , in pixels, starting from the top left of your screens.
-z, --fps   Display a frame per second counter.
-n, --filename   Display the name of the file on top of the window.
-m, --metadata   Display the metadata.
Empty without a default scene.
--hdri-skybox   Show the HDRI as a skybox. Overrides --bg-color and --no-background.
-u, --blur-background   Blur background.
Useful with a HDRI skybox.
--blur-coc 20 Blur circle of confusion radius.
--light-intensity 1.0 Adjust the intensity of every light in the scene.

Scientific visualization options

Options Default Description
-s, --scalars=<array_name>   Specify an array to Color with if present in the file. If no array_name is provided, the first in alphabetical order will be picked if any are available.
Requires a default scene.
Use --verbose to recover the usable array names.
-y, --comp=<comp_index> -1 Specify the component from the scalar array to color with.
Use with the scalar option. -1 means magnitude. -2 or the short option, -y, means direct values.
When using direct values, components are used as L, LA, RGB, RGBA values depending on the number of components.
-c, --cells   Specify that the scalar array is to be found on the cells instead of on the points.
Use with the scalar option.
--range=<min,max>   Set a custom range for the coloring by the array.
Use with the scalar option.
-b, --bar   Show scalar bar of the coloring by array.
Use with the scalar option.
--colormap=<color_list>   Set a custom colormap for the coloring.
This is a list of colors in the format val1,red1,green1,blue1,...,valN,redN,greenN,blueN
where all values are in the range (0,1).
Use with the scalar option.
-v, --volume   Enable volume rendering. It is only available for 3D image data (vti, dcm, nrrd, mhd files) and will display nothing with other formats.
-i, --inverse   Inverse the linear opacity function used for volume rendering.

Camera configuration options

Options Default Description
--camera-position=<X,Y,Z>   Set the camera position, overrides –camera-direction and camera-zoom-factor.
--camera-focal-point=<X,Y,Z>   Set the camera focal point.
--camera-view-up=<X,Y,Z>   Set the camera view up vector. Will be orthogonalized.
--camera-view-angle=<angle>   Set the camera view angle, a strictly positive value in degrees.
--camera-direction=<X,Y,Z>   Set the camera direction, looking at the focal point.
--camera-zoom-factor=<factor>   Set the camera zoom factor relative to the autozoom on data, a strictly positive value.
--camera-azimuth-angle=<angle> 0.0 Apply an azimuth transformation to the camera, in degrees, added after other camera options.
--camera-elevation-angle=<angle> 0.0 Apply an elevation transformation to the camera, in degrees, added after other camera options.

Raytracing options

Options Default Description
-r, --raytracing   Enable OSPRay raytracing. Requires OSPRay raytracing to be enabled in the linked VTK dependency.
--samples=<samples> 5 Set the number of samples per pixel when using raytracing.
-d, --denoise   Denoise the image when using raytracing.

PostFX (OpenGL) options

Options Description
-p, --translucency-support Enable translucency support. This is a technique used to correctly render translucent objects.
-q, --ambient-occlusion Enable ambient occlusion. This is a technique used to improve the depth perception of the object.
-a, --anti-aliasing Enable anti-aliasing. This technique is used to reduce aliasing.
-t, --tone-mapping Enable generic filmic Tone Mapping Pass. This technique is used to map colors properly to the monitor colors.

Testing options

Options Default Description
--ref=<png file>   Render and compare with the provided reference image, for testing purposes. Use with output option to generate new baselines and diff images.
--ref-threshold=<threshold> 50 Set the comparison threshold to trigger a test failure or success. The default (50) correspond to almost visually identical images.
--interaction-test-record=<log file>   Path to an interaction log file to record interaction events to.
--interaction-test-play=<log file>   Path to an interaction log file to play interactions events from when loading a file.

Rendering options precedence

Some rendering options are not compatible between them, here is the precedence order if several are provided:

  • Raytracing (-r)
  • Volume (-v)
  • Point Sprites (-o)

Options syntax

The --options=value syntax is used everywhere in this documentation, however, the syntax --options value can also be used, with the exception of options that have implicit values, --verbose, --comp and --scalars.