Difference between revisions of "ANIM (File Format)"

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(→‎Quaternion Array Format)
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|0x0
 
|0x0
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|[[#Quaternion Array Format|Quaternion array format]]
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|[[#Quaternion Array Format|Quaternion Array Format]]
 
|-
 
|-
 
|0x2
 
|0x2
−
|[[#Bitstream Format|Rotation vector bitstream format]]
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|[[#Rotation Vector Bitstream Format|Rotation Vector Bitstream Format]]
 
|}
 
|}
  
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|header‑>bone_entry_count
 
|header‑>bone_entry_count
 
|bone_entry_map
 
|bone_entry_map
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|The index-positions of this table correspond to the ''bone ids'' in the associated CINF. The value is 0xff if the bone is not animated by this ANIM or an index relating the ''bone_translation_map'' and ''quaternion_key_array'' below
+
|The index-positions of this table correspond to the ''bone ids'' in the associated [[CINF (File Format)|CINF]]. The value is 0xff if the bone is not animated by this ANIM or an index relating the ''bone_translation_map'' and ''quaternion_key_array'' below
 
|-
 
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|long
 
|long
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|}
 
|}
  
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== Bitstream Format ==
+
== Rotation Vector Bitstream Format ==
 +
 
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The '''Rotation Vector Bitstream Format''' is the most widely used animation format in ''Metroid Prime''.
 +
The format uses a compressed [[wikipedia:Bitstream|bitstream]] to store keys that have been
 +
[[wikipedia:Delta encoding|delta encoded]] and [[wikipedia:Quantization (signal processing)|quantized]]
 +
to make for a very compact, compressed animation. The data is processed sequentially to reconstruct the
 +
decompressed bone channel data.
 +
 
 +
In addition to the bitstream quantization, the format includes a bitmap specifying which frames of the animation have
 +
keys added. Consequently, the runtime constructs missing keys via interpolation (reducing animation size further).
 +
 
 +
=== Header2 ===
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 +
{| class="wikitable"
 +
!Offset
 +
!Length
 +
!Data Type
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!Identifier
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!Notes
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|-
 +
|0x0
 +
|4
 +
|long
 +
|scratch_size
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|Amount of memory that the animation system needs to allocate to process animation
 +
|-
 +
|0x4
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|4
 +
|long
 +
|evnt_ref
 +
|ID for this ANIM's [[EVNT (File Format)|EVNT]] resource, or 0xffffffff if no events triggered
 +
|-
 +
|0x8
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|4
 +
|long
 +
|unknown0
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|Always 0x1
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|-
 +
|0xC
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|4
 +
|float
 +
|duration
 +
|Time in seconds that the animation plays for
 +
|-
 +
|0x10
 +
|4
 +
|float
 +
|interval
 +
|Time in seconds between keys of each bone channel (reciprocal of frame-rate)
 +
|-
 +
|0x14
 +
|4
 +
|long
 +
|unknown1
 +
|Always 0x3
 +
|-
 +
|0x18
 +
|4
 +
|long
 +
|unknown2
 +
|Always 0x0
 +
|-
 +
|0x1C
 +
|4
 +
|long
 +
|rotation_divisor
 +
|Rotation vectors are divided by this value before being applied
 +
|-
 +
|0x20
 +
|4
 +
|float
 +
|translation_multiplier
 +
|Translation vectors are multiplied by this value before being applied
 +
|-
 +
|0x24
 +
|4
 +
|long
 +
|bone_channel_count
 +
|Count of bone channels present in ANIM
 +
|-
 +
|0x28
 +
|4
 +
|long
 +
|unknown3
 +
|Always 0x1
 +
|-
 +
|0x2C
 +
|4
 +
|long
 +
|key_bitmap_length
 +
|Number of bits in ''key bitmap''
 +
|}
 +
 
  
 
[[Category:File Formats]]
 
[[Category:File Formats]]

Revision as of 19:12, 22 February 2015

Morphball render.png This file format is almost completely documented
Having trouble with bone rotations +/- 180 degrees in format 2

The ANIM format is used in conjunction with the CINF and CSKR to animate rigged CMDL meshes.

There are two versions of the ANIM format in Metroid Prime (indicated by the file's first long value):

Version Description
0x0 Quaternion Array Format
0x2 Rotation Vector Bitstream Format

Quaternion Array Format

The Quaternion Array Format (0x0) is a less common animation format in Metroid Prime. It's only used in a Ridley intro animation and the rotating pirate data artifact hologram above the Impact Crater.

The format maps animation channels to bones and supplies rotations as an array of quaternion (WXYZ) keys. Optionally, translations may be specified for a subset of bones as an array of float3 keys.

Data Type Element Count Identifier Notes
Header0 1 header
char header‑>bone_entry_count bone_entry_map The index-positions of this table correspond to the bone ids in the associated CINF. The value is 0xff if the bone is not animated by this ANIM or an index relating the bone_translation_map and quaternion_key_array below
long 1 bone_channel_count Count of bone channels present in the bone_translation_map and quaternion_key_array below
char bone_channel_count bone_translation_map Each bone channel may be optionally augmented with translation vectors at the bottom of the file. The index-positions of this table correspond to the values in the bone_entry_map above. The value is 0xff if the bone is not translated by this ANIM or an index relating the quaternion_key_array below
long 1 quaternion_key_count Count of elements in quaternion_key_array below
float4 quaternion_key_count quaternion_key_array The quaternion keys are interleaved like such (bone-major): 
|------------|------------|-----|------------|
| bone0/key0 | bone0/key1 | ... | bone0/keyN |
| bone1/key0 | bone1/key1 | ... | bone1/keyN |
| .......... | .......... | ... | .......... |
| boneN/key0 | boneN/key1 | ... | boneN/keyN |
|------------|------------|-----|------------|
long 1 translation_key_count Count of elements in translation_key_array below
float3 translation_key_count translation_key_array The translation keys are interleaved like such (bone-major): 
|------------|------------|-----|------------|
| bone0/key0 | bone0/key1 | ... | bone0/keyN |
| bone1/key0 | bone1/key1 | ... | bone1/keyN |
| .......... | .......... | ... | .......... |
| boneN/key0 | boneN/key1 | ... | boneN/keyN |
|------------|------------|-----|------------|

Any bone channels that were marked 0xff in the bone_translation_map are skipped by this array

long 1 evnt_ref ID for this ANIM's EVNT resource, or 0xffffffff if no events triggered

Header0

Offset Length Data Type Identifier Notes
0x0 4 float duration Time in seconds that the animation plays for
0x4 4 float key_interval Time in seconds between keys of each bone channel (reciprocal of frame-rate)
0x8 4 long bone_entry_count Count of bone-channels in animation
0xC 4 long key_count Count of keys for each bone channel (keys are set for every frame of the animation)

Rotation Vector Bitstream Format

The Rotation Vector Bitstream Format is the most widely used animation format in Metroid Prime. The format uses a compressed bitstream to store keys that have been delta encoded and quantized to make for a very compact, compressed animation. The data is processed sequentially to reconstruct the decompressed bone channel data.

In addition to the bitstream quantization, the format includes a bitmap specifying which frames of the animation have keys added. Consequently, the runtime constructs missing keys via interpolation (reducing animation size further).

Header2

Offset Length Data Type Identifier Notes
0x0 4 long scratch_size Amount of memory that the animation system needs to allocate to process animation
0x4 4 long evnt_ref ID for this ANIM's EVNT resource, or 0xffffffff if no events triggered
0x8 4 long unknown0 Always 0x1
0xC 4 float duration Time in seconds that the animation plays for
0x10 4 float interval Time in seconds between keys of each bone channel (reciprocal of frame-rate)
0x14 4 long unknown1 Always 0x3
0x18 4 long unknown2 Always 0x0
0x1C 4 long rotation_divisor Rotation vectors are divided by this value before being applied
0x20 4 float translation_multiplier Translation vectors are multiplied by this value before being applied
0x24 4 long bone_channel_count Count of bone channels present in ANIM
0x28 4 long unknown3 Always 0x1
0x2C 4 long key_bitmap_length Number of bits in key bitmap
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