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OBD:M3GM: Difference between revisions
PS2 implementation of M3GM (not yet fully understood)
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(PS2 implementation of M3GM (not yet fully understood)) |
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{{OBDtr|0x20|link |FFFFC8|01 11 01 00|273 | link to [[OBD:IDXA_M3GM_2|00273-.IDXA]] (face groupings) }} | {{OBDtr|0x20|link |FFFFC8|01 11 01 00|273 | link to [[OBD:IDXA_M3GM_2|00273-.IDXA]] (face groupings) }} | ||
{{OBDtr|0x24|link |FFFFC8|01 D8 00 00|216 | link to 00216-.[[OBD:TXMP|TXMP]] (texture) }} | {{OBDtr|0x24|link |FFFFC8|01 D8 00 00|216 | link to 00216-.[[OBD:TXMP|TXMP]] (texture) }} | ||
{{OBDtr|0x28|link |C8FFC8|00 00 00 00|unused| | {{OBDtr|0x28|link |C8FFC8|00 00 00 00|unused| obsolete GMAN (geometry animation) link; never used in Oni}} | ||
{{OBDtr|0x2C|char[20]|C8FFFF|AD DE |dead | unused}} | {{OBDtr|0x2C|char[20]|C8FFFF|AD DE |dead | unused}} | ||
|} | |} | ||
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;Face groupings | ;Face groupings | ||
:The second IDXA groups the triangles into faces (oriented by the second VCRA). | :The second IDXA groups the triangles into faces (oriented by the second VCRA). | ||
;Geometry animation | |||
:Geometry animation worked in a way similar to texture animation, by picking M3GMs from an array (GMAN) and displaying them at a specified frame rate, optionally with randomization. | |||
;PS2 implementation | |||
:PS2 M3GMs have the same data size as PC and Mac ones (0x24 bytes of actual data, 0x2C if counting the instance and level IDs), but the layout is different. Normals aren't stored at all, hence both VCRA and the second IDXA are simply missing. Instead the M3GM explicitly stores the number of vertices, as well as (apparently) the number of unique XYZ coordinates (a.k.a. control points). There is also a mysterious .sep part (not yet documented). | |||
:An an example, consider M3GMaxes of level0_Final (even though it is somewhat broken). | |||
{{Table}} | |||
{{OBDth}} | |||
{{OBDtr|0x00|res_id |FF0000|01 63 00 00|99 | 00099-axes.M3GM}} | |||
{{OBDtr|0x04|lev_id |FFFF00|01 00 00 00|0 | level 0}} | |||
{{OBDtr|0x08|int32 |FFC8C8|00 00 00 00|0 | runtime geometry flags (supposedly the same as for PC and Mac) }} | |||
{{OBDtr|0x0C|int32 |FFC8C8|60 00 00 00|96 | number of vertices with unique XYZ coordinates? }} | |||
{{OBDtr|0x10|int32 |FFFFC8|01 64 00 00|100 | link to [[OBD:PNTA|00100-.PNTA]] (vertex XYZs) }} | |||
{{OBDtr|0x14|link |FFFFC8|01 65 00 00|101 | link to [[OBD:TXCA|00101-.TXCA]] (vertex UVs) }} | |||
{{OBDtr|0x18|link |FFFFC8|01 66 00 00|240 | link to [[OBD:IDXA_M3GM_1|00268-.IDXA]] (triangle strips) }} | |||
{{OBDtr|0x1C|int32 |FFC8C8|6C 00 00 00|108 | number of vertices (same as in PNTA and TXCA); also size of .raw part? }} | |||
{{OBDtr|0x20|offset |FFFFC8|A0 8E 01 00| 0x00018EA0 | apparently an offset into the .raw file, purpose unknown (108 first bytes shown in bold) | |||
'''2D 2D 2D 2D 2D 2D 2D 2D 2D 2D 2D 2D F8 F8 C2 55''' | |||
'''40 40 10 D4 D4 09 C2 5F 6B 6B 6B 6B 6B 6B 6B 6B''' | |||
'''6B 82 82 D9 16 E3 E3 00 EB EB 6D 6D 6D 6D 6D 6D''' | |||
'''6D 6D 6D 6D AB AB EB 80 52 FC 95 30 30 EA EA EA''' | |||
'''EA EA A7 A7 24 EA EA EA EA 24 02 02 02 A7 A7 A7''' | |||
'''A7 EF EA EA EA EA 02 02 02 02 24 24 24 24 F8 2D''' | |||
'''2D 2D 2D A7 A7 A7 A7 EA EA EA EA 16''' 02 02 02 02 | |||
Current assumption is that they are color indices, but it is unclear what palette is referenced. | |||
}} | |||
{{OBDtr|0x24|link |FFFFC8|01 67 00 00|103 | broken texture link (there is no instance 103 (!) and the relevant texture is 00104-_axis.[[OBD:TXMP|TXMP]] }} | |||
{{OBDtr|0x28|link |C8FFC8|00 00 00 00|unused| supposedly the same GMAN link (geometry animation) as for PC and Mac }} | |||
{{OBDtr|0x2C|char[20]|C8FFFF|AD DE |dead | unused}} | |||
|} | |||
Even without a full understanding of the .raw part, the current knowledge is sufficient to extract M3GM data and even to export it to other formats (with missing or autogenerated normals). | |||