OBD:OBOA

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Offset	Type	Raw Hex	Value	Description
0x00	res_id	01 55 02 00	597	00597-.OBOA
0x04	lev_id	01 00 00 06	3	level 3
0x08	char[22]	AD DE	dead	unused
0x1E	int16	62 00	98	arrray size
First element (black outline)
0x00	int32	01 56 02 00	1	link to 00598-.M3GA
0x04	link	00 00 00 00	unused	link to an OBAN file
0x08	link	00 00 00 00	unused	link to an ENVP file
0x0C	bitset32	00 12 00 00	0, 18, 0, 0	flags; the following bits are used: 0x00 02 00 00 - package used 0x00 04 00 00 - object is a blender 0x00 10 00 00 - object uses a bounding box for collision detection
0x10	int32	46 89 00 00	35142	unknown
0x14	int32	01 00 00 00	1	door ID; only used for doors; in the case of double doors both doors have the same id but one of the door identifiers has bit 12 set
0x18	int32	00 00 00 00	0	unknown; the following values are used: 0 - none 3 - OBAN link used (note: doors don't have OBAN links)
0x1C	int32	FF FF 00 00	65535	object ID (65535 = not used)
0x20	float	00 00 4F 43	207.000000	initial x-position
0x24	float	1F 05 F6 42	123.010002	initial y-position (height)
0x28	float	98 7F CC C3	-408.996826	initial z-position
0x2C	float	F2 04 35 3F	0.707107	x component of the initial rotation quaternion
0x30	float	74 BC 82 B9	-0.000249	y component of the initial rotation quaternion
0x34	float	74 BC 82 B9	-0.000249	z component of the initial rotation quaternion
0x38	float	F3 04 35 3F	0.707107	w component of the initial rotation quaternion
0x3C	float	00 00 80 3F	1.000000	initial scale of the object
0x40	float	FC FF 7F 3F	0.999999	m11 element of the initial position transform matrix
0x44	float	00 00 00 00	0.000000	m21 element of the initial position transform matrix
0x48	float	8A E3 38 BA	-0.000705	m31 element of the initial position transform matrix
0x4C	float	8A E3 38 BA	-0.000705	m12 element of the initial position transform matrix
0x50	float	2E DE 4C 32	0.000000...	m22 element of the initial position transform matrix
0x54	float	FC FF 7F BF	-0.999999	m32 element of the initial position transform matrix
0x58	float	C9 F5 13 2D	0.000000...	m13 element of the initial position transform matrix
0x5C	float	00 00 80 3F	1.000000	m23 element of the initial position transform matrix
0x60	float	2B DE 4C 32	0.000000...	m33 element of the initial position transform matrix
0x64	float	00 00 4F 43	207.000000	m14 element of the initial position transform matrix (x-position)
0x68	float	1F 05 F6 42	123.010002	m24 element of the initial position transform matrix (y-position, height)
0x6C	float	98 7F CC C3	-408.996826	m34 element of the initial position transform matrix (z-position)
0x70	char[64]	object_door_1		name of the object
0xB0	char[64]	L3_Gunk.ENV		internal object file name; maybe an old development relict

Elements m41, m42, m43, m44 of both transform matrices are missing. m41, m42 and m43 are the projection transform coefficients and they are not needed so they are 0.0 and the m44 element is always 1.0 for a transform matrix. (column major transform matrices like in Open GL, for Direct 3D they need to be transposed)

The initial position transform is used the place the object in the environment. For object that have an animation attached to them this is also the starting position of the animation sequence. The initial x,y and z position value together with the initial rotation quaternion and the initial scale factor contain basically the same information as the initial transform matrix and combining them in a transform matrix should result in the initial transform matrix (less the differences due to floating point computation errors)

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OBDC << Other file types >> OFGA
OBOA : Starting Object Array
Level file