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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.
311 lines
9.4 KiB
Plaintext
311 lines
9.4 KiB
Plaintext
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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