Difference between revisions of "Talk:FA1C39F7"
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(Discussion of my efforts to parse this record format.) |
(I know more now, so I updated my description and commentary to match.) |
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==Say What?== | ==Say What?== | ||
| − | I`ve been investigating this record format because it is one of the most numerous formats in a lot file that I believe is corrupted. Unfortunately, I have been having some difficulty with the record format as described. Still, I have been able to decode * | + | I`ve been investigating this record format because it is one of the most numerous formats in a lot file that I believe is corrupted. Unfortunately, I have been having some difficulty with the record format as described. Still, I have been able to decode *most* of it. However, as my understanding of the record format has improved, I have discovered that the data I am seeing does not quite match the description. In the hope that someone could help me, and that my experience might help others, and not wanting to mess up the existing description with my misunderstandings, I documented my observations here. Even though my understanding of the format has improved considerably since originaly posting this commentary, and I have updated my description to match, I am still working on this record at the time of writing. |
I start with some relatively simple structures that occur a variable number of times in the record, and build my way up towards the full description: | I start with some relatively simple structures that occur a variable number of times in the record, and build my way up towards the full description: | ||
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*[[7BITSTR]]: Name | *[[7BITSTR]]: Name | ||
*CoOrdinates block | *CoOrdinates block | ||
| + | |||
| + | I call these blocks "Slot" blocks because some of the "Name" entries actually have the word "slot" as part of their value. | ||
==cObjectBlock blocks== | ==cObjectBlock blocks== | ||
*[[7BITSTR]]: Unknown [Name?] | *[[7BITSTR]]: Unknown [Name?] | ||
| Line 23: | Line 25: | ||
*DWORD: Count | *DWORD: Count | ||
*MaterialMesh block: Repeat Count times | *MaterialMesh block: Repeat Count times | ||
| + | |||
| + | I had to invent a name for these blocks, but was singularly uninspired at the time. Any suggestions? | ||
==cObject blocks== | ==cObject blocks== | ||
*[[7BITSTR]]: Model | *[[7BITSTR]]: Model | ||
| Line 30: | Line 34: | ||
*DWORD: Count | *DWORD: Count | ||
*Slot block: Repeat Count times | *Slot block: Repeat Count times | ||
| − | |||
| − | |||
==cAnimatable blocks== | ==cAnimatable blocks== | ||
| − | *DWORD: BlockID | + | *DWORD: BlockID; always the BlockID for cObject blocks |
| − | *DWORD: | + | *DWORD: Version of embedded cObject block |
| − | *[[7BITSTR]]: Name | + | *[[7BITSTR]]: Name; always "cObject", matching the BlockID |
| − | * | + | *cObject block |
| − | + | ||
| − | + | ||
| − | + | ||
| − | + | ||
| − | + | ||
| − | + | ||
*DWORD: Count | *DWORD: Count | ||
| − | * | + | *Blend block: Repeat Count times |
| + | *Float: Unknown, always 1.0 | ||
| + | *DWORD: Unknown, always 1 | ||
| + | *CoOrdinates block: Occurs twice | ||
| + | *Unknown, 24 bytes long for Version<16, 28 bytes for Version>15; apparently cannot be a CoOrdinates block, not only because of the size, but because some values decode into "Not A Number" | ||
*CoOrdinates block | *CoOrdinates block | ||
| − | |||
| − | |||
| − | |||
| − | |||
| − | + | The Anim block described on the main page has not been seen for Version<17, but no blocks Version>16 have been observed yet either. | |
==Full Record== | ==Full Record== | ||
*64 BYTEs: Unknown, always zeroes | *64 BYTEs: Unknown, always zeroes | ||
| Line 60: | Line 56: | ||
*cAnimatable block: Only if Block ID matches cAnimatable BlockID | *cAnimatable block: Only if Block ID matches cAnimatable BlockID | ||
*cPerson block: Only if BlockID matches cPerson BlockID | *cPerson block: Only if BlockID matches cPerson BlockID | ||
| + | *DWORD: Unknown, apparently always 0x00000000 or 0x00FE0000 | ||
==Notes== | ==Notes== | ||
| − | The inexplicably-varying portions of the record | + | The formerly inexplicably-varying portions of the record suspected to depend on the fields labeled "(Version?)" [as reported in the first version of this page] has been confirmed: the cAnimatable blocks actualy *do* contain cObject blocks, and it seems highly probable that the cPerson blocks also contain cAnimatable blocks. At this time, however, I have not yet attempted to analyse the cPerson blocks. --GeneralOperationsDirector |
Revision as of 02:36, 13 October 2010
Contents |
Say What?
I`ve been investigating this record format because it is one of the most numerous formats in a lot file that I believe is corrupted. Unfortunately, I have been having some difficulty with the record format as described. Still, I have been able to decode *most* of it. However, as my understanding of the record format has improved, I have discovered that the data I am seeing does not quite match the description. In the hope that someone could help me, and that my experience might help others, and not wanting to mess up the existing description with my misunderstandings, I documented my observations here. Even though my understanding of the format has improved considerably since originaly posting this commentary, and I have updated my description to match, I am still working on this record at the time of writing.
I start with some relatively simple structures that occur a variable number of times in the record, and build my way up towards the full description:
Blend blocks
MaterialMesh blocks
CoOrdinates blocks
- FLOAT: X
- FLOAT: Y
- FLOAT: Height
- 16 Bytes: Quaternion
Slot blocks
- 7BITSTR: Name
- CoOrdinates block
I call these blocks "Slot" blocks because some of the "Name" entries actually have the word "slot" as part of their value.
cObjectBlock blocks
- 7BITSTR: Unknown [Name?]
- DWORD: Unknown, only present for Version=17
- DWORD: Count
- MaterialMesh block: Repeat Count times
I had to invent a name for these blocks, but was singularly uninspired at the time. Any suggestions?
cObject blocks
- 7BITSTR: Model
- DWORD: Count
- cObjectBlock block: Repeat Count times
- CoOrdinates block
- DWORD: Count
- Slot block: Repeat Count times
cAnimatable blocks
- DWORD: BlockID; always the BlockID for cObject blocks
- DWORD: Version of embedded cObject block
- 7BITSTR: Name; always "cObject", matching the BlockID
- cObject block
- DWORD: Count
- Blend block: Repeat Count times
- Float: Unknown, always 1.0
- DWORD: Unknown, always 1
- CoOrdinates block: Occurs twice
- Unknown, 24 bytes long for Version<16, 28 bytes for Version>15; apparently cannot be a CoOrdinates block, not only because of the size, but because some values decode into "Not A Number"
- CoOrdinates block
The Anim block described on the main page has not been seen for Version<17, but no blocks Version>16 have been observed yet either.
Full Record
- 64 BYTEs: Unknown, always zeroes
- DWORD: BlockID
- DWORD: Version
- 7BITSTR: Name; always matches BlockID
- cObject block: Only if BlockID matches cObject BlockID
- cAnimatable block: Only if Block ID matches cAnimatable BlockID
- cPerson block: Only if BlockID matches cPerson BlockID
- DWORD: Unknown, apparently always 0x00000000 or 0x00FE0000
Notes
The formerly inexplicably-varying portions of the record suspected to depend on the fields labeled "(Version?)" [as reported in the first version of this page] has been confirmed: the cAnimatable blocks actualy *do* contain cObject blocks, and it seems highly probable that the cPerson blocks also contain cAnimatable blocks. At this time, however, I have not yet attempted to analyse the cPerson blocks. --GeneralOperationsDirector
