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Overview

We Ideally, you'll want to have assets that take the lowest amount of memory, but that animate at the highest possible quality.

Uncompressed, an animation contains a key for every frame in the animation and for each joint that has been exported. We You'll usually want to reduce the amount of joints and keys to minimize the size. We have separate channels for rotation keys and position keys per joint.

To compress animations for characters we use the the Resource Compiler tool (RC).

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Choose your animation in the Animations tree in Asset Explorer. Note that both * .i_caf and *.animsettings should present and writable. (Not inside a *.pak file)

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The goal should be at this point to have an animation that takes as little as possible but looks good. Sometimes though, playing around with global values for a whole animation is not enough, and we will need to fix up individual joints that show choppy motion.

 


Per-Joint Setup

Per joint control over the epsilons removal process

  • For each joint, by default, the epsilon values are used to decide if they are removed or not.
  • We can force a joint to be removed by clicking the checkbox next to it. Position and Rotation channels will both be removed for the selected joints.

Per joint control over the compression value

  • For each joint we can specify a multiplier that is applied to the Compression value. By default this value is 1, so a joint uses the global Compression value.

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To remove a tag you can use the context menu (RMB on the tag name):


 

Tip

For curious readers: tags are case insensitive. I.e. the tag "CINEMATIC" will be treated the same way as "cinematic".

Batch-compression

Compression Presets can be used to apply the same set of compression rules to multiple animations at once. You can locate them in the Compression section of the Asset Explorer.

Each compression preset entry defines a filter that can match animations according to a certain filter, i.e. a set of criteria such as folder, filename or tags. Such criteria can be combined using logical operations into a complex condition, like "in folder and doesn't contain specific tag but has substring in name". When multiple presets match the same animation only the first one is used. You can always preview which compression setting entry was applied to animation in the animation properties (by selection a specific animation in the asset explorer).

DBA Creation

DBA files are bundles of animations which can be streamed in and out as one. They are typically smaller and take up less memory than individual animations. 


DBAs are created using the same filters as compression presets. I.e. you can define a combination of criteria, e.g. location, name or tags to select animations for a specific DBA.

DBA descriptions are saved into: <GameFolder>\Assets\Animations.pak\DBATable.json and used by the RC at build time to create actual DBA files.

The DBA Table can be found in the Compression section of the Asset Explorer.

Define Animation Filter (DBA or Compression Presets)

An Animation Filter allows you to choose a set of animation files for specific DBA or Compression Preset. An Animation Filter is defined as a tree of condition nodes.

These options are displayed in the Scene Parameters when you select Compression -> Compression Presets or Compression -> DBA Table.

Some of them are condition nodes that can be used to group other nodes, like "And" and "Or", the rest are used to check some of the criteria of the animation.

Condition

Description

Empty Filter

Creates an empty filter.

And

Succeeds when all of the child conditions succeed.

Or

Succeeds when at least one of the child conditions succeeds.

In Folder

Check if animation is located within a specific folder.

Has Tags

Checks if animation has all of the listed tags.

Tags are stored in ANIMSETTINGS and can be set in Animation Properties (see above).

Contains In Name

Checks for a substring within animation name.

Contains in Path

Checks for a substring within animation path.

Skeleton Alias

Checks if animation uses specific Skeleton Alias. Skeleton aliases are defined in the Skeleton Table.