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Add Kaitai Struct definition for animation files (.ani) (#1734)
Add animation.ksy documenting the binary format for LEGO Island's animation files, including keyframe data, actor references, and optional camera animation. Includes sample file pns065rd.ani.
This commit is contained in:
Christian Semmler
@@ -18,6 +18,7 @@ Kaitai Struct allows you to define binary formats in a YAML-based `.ksy` file, w
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| [`savegame.ksy`](/docs/savegame.ksy) | `.GS` | Main game save data (game state, progress, customizations) |
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| [`players.ksy`](/docs/players.ksy) | `.gsi` | Player profile save data (usernames) |
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| [`history.ksy`](/docs/history.ksy) | `.gsi` | Score history and high scores |
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| [`animation.ksy`](/docs/animation.ksy) | `.ani` | Animation data (keyframes, actor references, camera animation) |
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## Using the Tools
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@@ -38,6 +39,9 @@ ksv samples/Players.gsi players.ksy
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# View a History.gsi file
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ksv samples/History.gsi history.ksy
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# View an animation file
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ksv samples/pns065rd.ani animation.ksy
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```
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### Kaitai Struct Dump (ksdump)
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@@ -53,11 +57,15 @@ ksdump --format json samples/Players.gsi players.ksy
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# Dump History.gsi to YAML
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ksdump --format yaml samples/History.gsi history.ksy
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# Dump an animation file to JSON
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ksdump --format json samples/pns065rd.ani animation.ksy
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```
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## Sample Files
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The [`samples/`](/docs/samples/) directory contains example save files for testing:
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The [`samples/`](/docs/samples/) directory contains example files for testing:
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- `G0.GS`, `G1.GS`, `G2.GS` - Sample main game save files (slots 0, 1, 2)
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- `Players.gsi` - Sample player profile data
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- `History.gsi` - Sample score history data
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- `pns065rd.ani` - Sample animation file
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310
docs/animation.ksy
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310
docs/animation.ksy
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@@ -0,0 +1,310 @@
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meta:
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id: animation
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title: Animation File
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application: LEGO Island
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file-extension: ani
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license: CC0-1.0
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endian: le
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doc: |
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Animation file format for LEGO Island (1997). Contains skeletal animation
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data including actor references, keyframes for translation/rotation/scale,
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morph visibility keys, and optional camera animation data.
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Animation files are embedded within SI (Interleaf) files and
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parsed by LegoAnimPresenter. The format consists of a header with bounding
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information, an actor list, animation duration, optional camera animation,
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and a hierarchical tree of animation nodes.
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seq:
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- id: magic
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type: s4
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doc: |
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Magic number identifying the file format. Must be 0x11 (17 decimal).
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- id: bounding_radius
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type: f4
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doc: |
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Radius of the bounding sphere encompassing the entire animation.
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Used for visibility culling and collision detection.
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- id: center_x
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type: f4
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doc: X coordinate of the bounding sphere center point.
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- id: center_y
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type: f4
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doc: Y coordinate of the bounding sphere center point.
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- id: center_z
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type: f4
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doc: Z coordinate of the bounding sphere center point.
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- id: has_camera_anim
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type: s4
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doc: |
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Flag indicating whether camera animation data follows the actor list.
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If non-zero, a camera_anim structure is present after the duration field.
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- id: unused
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type: s4
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doc: |
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Unused field. Read by the parser but not used for anything.
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- id: num_actors
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type: u4
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doc: Number of actor entries in the actor list.
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- id: actors
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type: actor_entry
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repeat: expr
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repeat-expr: num_actors
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doc: |
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List of actors referenced by this animation. Each entry contains
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the actor name and type, which determines how the actor ROI is
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managed during animation playback.
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- id: duration
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type: s4
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doc: Total duration of the animation in milliseconds.
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- id: camera_anim
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type: camera_anim
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if: has_camera_anim != 0
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doc: |
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Camera animation data including position, target, and rotation keys.
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Only present if has_camera_anim is non-zero.
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- id: root_node
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type: tree_node
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doc: |
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Root node of the animation tree. The tree structure mirrors the
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skeletal hierarchy of the animated model, with each node containing
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keyframe data for its corresponding bone/part.
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types:
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actor_entry:
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doc: |
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An actor reference in the animation. The name identifies which ROI
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(Realtime Object Instance) to animate, and the type determines
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how the actor is managed by the character manager.
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seq:
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- id: name_length
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type: u4
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doc: Length of the actor name in bytes.
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- id: name
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type: str
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size: name_length
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encoding: ASCII
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if: name_length > 0
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doc: Actor name used to look up the ROI in the scene.
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- id: actor_type
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type: u4
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enum: actor_type
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if: name_length > 0
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doc: |
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Determines how the actor ROI is created and managed.
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See actor_type enum for possible values.
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camera_anim:
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doc: |
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Camera animation data (LegoAnimScene). Contains keyframes for camera
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position, look-at target position, and roll rotation around the
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view axis.
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seq:
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- id: num_translation_keys
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type: u2
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doc: Number of camera position keyframes.
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- id: translation_keys
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type: translation_key
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repeat: expr
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repeat-expr: num_translation_keys
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doc: Camera position keyframes.
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- id: num_target_keys
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type: u2
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doc: Number of look-at target position keyframes.
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- id: target_keys
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type: translation_key
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repeat: expr
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repeat-expr: num_target_keys
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doc: Look-at target position keyframes.
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- id: num_rotation_keys
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type: u2
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doc: Number of camera roll rotation keyframes.
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- id: rotation_keys
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type: rotation_z_key
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repeat: expr
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repeat-expr: num_rotation_keys
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doc: Camera roll rotation keyframes (rotation around view axis).
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tree_node:
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doc: |
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A node in the animation tree hierarchy. Each node contains animation
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data for one part of the model and references to child nodes.
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seq:
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- id: data
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type: node_data
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doc: Animation keyframe data for this node.
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- id: num_children
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type: u4
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doc: Number of child nodes.
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- id: children
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type: tree_node
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repeat: expr
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repeat-expr: num_children
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doc: Child nodes in the animation hierarchy.
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node_data:
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doc: |
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Animation data for a single node (LegoAnimNodeData). Contains the
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node name and arrays of keyframes for translation, rotation, scale,
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and morph (visibility) animations.
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seq:
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- id: name_length
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type: u4
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doc: Length of the node name in bytes.
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- id: name
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type: str
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size: name_length
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encoding: ASCII
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if: name_length > 0
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doc: |
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Node name used to match this animation data to a ROI in the scene.
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Names starting with '*' indicate special handling (actor name
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substitution). Names starting with '-' are ignored.
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- id: num_translation_keys
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type: u2
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doc: Number of translation keyframes.
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- id: translation_keys
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type: translation_key
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repeat: expr
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repeat-expr: num_translation_keys
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doc: Translation (position) keyframes.
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- id: num_rotation_keys
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type: u2
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doc: Number of rotation keyframes.
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- id: rotation_keys
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type: rotation_key
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repeat: expr
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repeat-expr: num_rotation_keys
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doc: Rotation keyframes (quaternion format).
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- id: num_scale_keys
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type: u2
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doc: Number of scale keyframes.
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- id: scale_keys
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type: scale_key
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repeat: expr
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repeat-expr: num_scale_keys
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doc: Scale keyframes.
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- id: num_morph_keys
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type: u2
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doc: Number of morph (visibility) keyframes.
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- id: morph_keys
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type: morph_key
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repeat: expr
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repeat-expr: num_morph_keys
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doc: Morph keyframes controlling visibility.
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anim_key:
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doc: |
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Base animation key containing time and flags. The time and flags
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are packed into a single 32-bit value: bits 0-23 contain the time
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in milliseconds, and bits 24-31 contain flags.
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seq:
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- id: time_and_flags
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type: s4
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doc: |
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Packed time and flags value.
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- Bits 0-23: Time in milliseconds (mask with 0xFFFFFF)
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- Bits 24-31: Flags (shift right by 24)
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instances:
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time:
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value: time_and_flags & 0xFFFFFF
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doc: Keyframe time in milliseconds.
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flags:
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value: (time_and_flags >> 24) & 0xFF
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doc: |
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Keyframe flags:
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- 0x01 (active): Key has meaningful data
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- 0x02 (negate_rotation): Negate quaternion for interpolation
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- 0x04 (skip_interpolation): Use this key's value without blending
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translation_key:
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doc: |
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Translation keyframe containing position offset (LegoTranslationKey).
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The translation is applied relative to the parent node's transform.
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seq:
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- id: key
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type: anim_key
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doc: Base key with time and flags.
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- id: x
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type: f4
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doc: X component of translation.
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- id: y
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type: f4
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doc: Y component of translation.
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- id: z
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type: f4
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doc: Z component of translation.
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rotation_key:
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doc: |
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Rotation keyframe containing a quaternion (LegoRotationKey).
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The quaternion is stored as (angle, x, y, z) where angle is the
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scalar/w component and (x, y, z) is the vector part.
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seq:
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- id: key
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type: anim_key
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doc: Base key with time and flags.
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- id: angle
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type: f4
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doc: |
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Quaternion scalar component (w). A value of 1.0 with x=y=z=0
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represents no rotation (identity quaternion).
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- id: x
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type: f4
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doc: Quaternion x component.
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- id: y
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type: f4
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doc: Quaternion y component.
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- id: z
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type: f4
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doc: Quaternion z component.
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scale_key:
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doc: |
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Scale keyframe containing scale factors (LegoScaleKey).
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Scale is applied relative to the local origin of the node.
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seq:
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- id: key
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type: anim_key
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doc: Base key with time and flags.
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- id: x
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type: f4
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doc: X scale factor (1.0 = no scaling).
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- id: y
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type: f4
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doc: Y scale factor (1.0 = no scaling).
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- id: z
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type: f4
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doc: Z scale factor (1.0 = no scaling).
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morph_key:
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doc: |
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Morph/visibility keyframe (LegoMorphKey). Controls whether the
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node's ROI is visible at a given time.
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seq:
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- id: key
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type: anim_key
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doc: Base key with time and flags.
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- id: visible
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type: u1
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doc: Visibility flag. Non-zero means visible.
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rotation_z_key:
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doc: |
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Z-axis rotation keyframe (LegoRotationZKey). Used for camera roll
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animation where only rotation around the view axis is needed.
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seq:
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- id: key
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type: anim_key
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doc: Base key with time and flags.
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- id: z
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type: f4
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doc: Rotation angle around the Z axis in radians.
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enums:
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actor_type:
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2: managed_lego_actor
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3: managed_invisible_roi_trimmed
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4: managed_invisible_roi
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5: scene_roi_1
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6: scene_roi_2
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BIN
docs/samples/pns065rd.ani
Normal file
BIN
docs/samples/pns065rd.ani
Normal file
Binary file not shown.
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