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Overview

FBX (sometimes called Filmbox) is an interchange file format used to move 3D animation data between software packages. It can contain entire scenes, including geometry, lights, cameras, NURBS, animation, and skinning.

  1. Choose File ▸ Export ▸ Filmbox FBX.

  2. Click the chooser button next to the File field and choose the file you want to export to.

  3. Click Export to perform the actual export.

Note

FBX format specification generally does not support animated objects with a changing number of points or changing connectivity, such as Houdini’s particle systems or fluids. It is only possible to export these types of objects by breaking them up into individual triangles (although still within one FBX object node).

To restore these objects to their original appearance when they are brought into another packages, their vertices have to welded together, and all appropriate mesh edges have to set to "smooth".

Export in ASCII

If checked, the exported FBX file will be in human-readable ASCII format. Otherwise, it will be exported as a binary FBX file.

Time Interval

Export With Take

Houdini take to export.

Valid Frame Range

Determines whether a static single frame or an animation segment is exported.

Export Current Frame

Only the current frame will be exported. The resulting FBX file will contain a static scene only with no animation.

Export Frame Range

A frame range will be exported, as determined by the "Start/End/Inc" option below. The resulting FBX file will contain one take of animation.

Start/End/Inc

Determines the start frame, end frame, and frame increment to be exported.

Source Objects

Export

Determines the node to start exporting at. Defaults to "/obj", meaning all objects and subnetworks under it will be exported. If a node to be exported is a network, only its contents will be written out, not the network itself.

Create Root for Subnet

Create an extra root for the Export node when it is a subnetwork. This causes the exporting subnetwork node itself to be represented in the FBX file.

General Options

FBX SDK Version

Allows the user to chose which version of the SDK to use to export the FBX file.

Vertex Cache Format

Determines which format vertex cache files will be exported in.

Maya Compatible (MC)

Maya’s native vertex cache format.

3DS MAX Compatible (PC2)

Vertex cache format compatible with 3DS MAX.

Export Invisible Objects

Determines how invisible objects are to be exported. This is convenient if a scene contains hidden objects that are highly complex but do not need to exported.

As Hidden Null Nodes

Each hidden objects will be represented as a hidden Null node in FBX. No time will be spent exporting its geometry.

As Hidden Full Nodes

Each hidden object will be represented as an appropriate type in FBX. Processing time will be the same as if the object were not hidden.

Conversion Level of Detail

This option determines the level of detail to use when converting non-polygonal objects to polygons. Higher values increase polygon subdivision level, lower values decrease it.

Detect Constant Point Count Dynamic Objects

If checked, the exporter will try to detect animated objects that do not change point count or point connectivity, and export them without breaking them up into individual triangles, as is done with particle systems and fluids. This allows for RBD or cloth objects to be exported as a single, smooth object, while still allowing topology-changing objects to be exported.

This may fail if a object with changing point connectivity happens to have exactly the same point count over all frames of exported animation. In these case, this option should be disabled.

Convert NURBS and Bezier Surfaces to Polygons

If checked, the exporter will convert all NURBS and Bezier surfaces to polygonal meshes using the level of detail below to determine mesh density. Otherwise, NURBS and Bezier surfaces will be exported as NURBS.

Conserve Memory at the Expense of Export Time

Affects only objects exported with vertex caches. If checked, internal vertex positions computed during export will be discarded, not cached, resulting in reduced overall memory use. However, this will increase the export time. If left unchecked, the exporter will run faster but use more memory.

Export Deforms as Vertex Caches

If checked, any geometry objects that contain Deform SOPs will be exported as vertex caches with no weight information. If unchecked, these nodes will be exported as objects with skinning and corresponding weights.

Force Blend Shapes Export

If checked, blend shapes SOPs found in geometry nodes will always be exported, potentially loosing information doing so, as any node modifying the geometry after the blend shapes will be ignored. If unchecked, blend shapes SOPs will only be exported if no modification is done to the geometry after them.

Force Skin Deform Export

If checked, Deform SOPs found in geometry nodes will always be exported, potentially losing information doing so, as any nodes modifying the geometry after the Deform will be ignored. Only Bone Deform, Bone Capture and Capture Override nodes are currently supported. If unchecked, these nodes will only be exported if no modification is done to the geometry after them.

Export End Effectors

If unchecked, additional end effectors null nodes at the end of each branch of a skeleton will not be exported. This will help in reducing the number of joints exported to a FBX file. However, the exported FBX file will not reimport properly in Houdini afterwards, effectively missing one joint/bone for each branch of the skeleton.

If checked, additional end effectors null nodes will be exported, allowing the FBX file to be reimported correctly.

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