WriteGeo

Writes out geometry to a specified file. You can export:

• OBJ files

• FBX files containing meshes, point clouds, cameras, lights, and axes.

• Alembic (.abc) files containing meshes, point clouds, cameras, or axes. For more information on Alembic, see http://code.google.com/p/alembic/.

You can write the geometry by clicking the Execute button and specifying a range of frames you want written or by running the Nuke script with the -x switch.

Inputs and Controls

Connection Type	Connection Name	Function
Input	unnamed	The geometry or scene you want to write out to a specified file.

Control (UI)	Knob (Scripting)	Default Value	Function
WriteGeo Tab
file	file	none	Enter the file path and file name or use the folder icon to browse to the required location.
Execute	Execute	N/A	Click to write the input geometry to the file specified in the file control.
frame range	first	1	When limit to range is enabled, enter the first frame to write to the specified file.
frame range	last	1	When limit to range is enabled, enter the last frame to write to the specified file.
limit to range	use_limit	disabled	When enabled, enter the first and last frames to write to the specified file.
views	views	main	When you’re working with stereo footage, select the required view.
file type	file_type	none	Select the file type you intend to write: • none - Nuke attempts to guess the file type from the file name, but you cannot set any type-specific controls. • abc - when the WriteGeo node is connected to a Scene node, writes to an .abc file and exposes the Alembic-specific controls (see abc Options). • fbx - when the WriteGeo node is connected to a Scene node, writes to an .fbx file and exposes the FBX-specific controls (see fbx Options). • obj - write to an .obj file.
abc Options (These controls are only exposed when file type is set to abc.)
geometries	writeGeometries	enabled	When enabled, write the scene geometries into the .abc file.
pointClouds	writePointClouds	enabled	When enabled, write the scene point clouds into the .abc file.
cameras	writeCameras	enabled	When enabled, write the scene cameras to the .abc file.
axes	writeAxes	enabled	When enabled, write the scene axes into the .abc file.
storage format	storageFormat	HDF	Select the storage format to use when writing the file: • HDF - A storage format that maintains backwards compatibility. • Ogawa - A storage format that offers faster file reading and smaller files.
fbx Options (These controls are only exposed when file type is set to fbx.)
geometries	writeGeometries	enabled	When enabled, write the scene geometries into the .fbx file.
cameras	writeCameras	enabled	When enabled, write the scene cameras to the .fbx file.
lights	writeLights	enabled	When enabled, write the scene lights into the .fbx file.
axes	writeAxes	enabled	When enabled, write the scene axes into the .fbx file.
point clouds	writePointClouds	enabled	When enabled, write the scene point clouds into the .fbx file.
ascii file format	asciiFileFormat	disabled	When disabled, a binary .fbx file is written. Check ascii file format to write the scene as an ascii .fbx file.
animate mesh vertices	animateMeshVertices	disabled	When enabled, the mesh vertices are animated and keyframes created at every frame. The animated meshes use vertex point cache for the data and a directory with _fpc appended to the file name is created to contain the point caches.
Python Tab (These controls are for Python callbacks and can be used to have Python functions automatically called when various events happen in Nuke.)
before render	beforeRender	none	These functions run prior to starting rendering in execute(). If they throw an exception, the render aborts.
before each frame	beforeFrameRender	none	These functions run prior to starting rendering of each individual frame. If they throw an exception, the render aborts.
after each frame	afterFrameRender	none	These functions run after each frame is finished rendering. They are not called if the render aborts. If they throw an exception, the render aborts.
after render	afterRender	none	These functions run after rendering of all frames is finished. If they throw an error, the render aborts.
render progress	renderProgress	none	These functions run during rendering to determine progress or failure.

Step-by-Step Guides

Exporting Geometry, Cameras, Lights, Axes, or Point Clouds