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.RDT (Resident Evil 3)

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Patrice Mandin edited this page May 7, 2020 · 13 revisions

Table of Contents

Games

The .RDT file format is used to stored the description of a room in Resident Evil 3. It should contain the camera position (to correctly display 3D objects), the background images and sprites used to draw the scene, description of when to change camera, position of enemies when entering room, and so on...

Structure

The structure is the same as the one for Resident Evil 2 .RDT. However there are some differences, listed below.

Offset 6 (*.SCA)

The header is 16 bytes. 

typedef struct {
	unsigned long Amount;
	unsigned long unknown0[3];
} rdt_offset6_t;

Immediately following is an array of elements which contain attributes for each collision. Subtract 1 from Amount for the real total. 

typedef struct {
	signed short int X1;
	signed short int Z1;
	signed short int X2;
	signed short int Z2;
	unsigned short unknown[4];
} rdt_offset6elt_t;

rdt_offset6elt_t Collision[Amount-1];

Offset 16, initialization script

This is the initialization script for the room. It starts with an array of unsigned short, giving offset to each function of the script. Thus, the first offset listed / 2 gives you the number of functions in the script. Then follows the script, in bytecode-style.

0x00-0x0f

Byte Instruction Length Description
0x00 Nop 1
0x01 Return 2 Exit current function
0x02 Sleep 1 1 Sleep for 1 game tick.
0x03 EVT_CHAIN 2
0x04 EVT_EXEC 4 Execute an instruction when a precise event occurs. 
typedef struct {
	unsigned char opcode; /* 0x04 */
	unsigned char event;
	unsigned short instruction;	/* Most likely a function call, 0x19xx */
} script_evt_exec_t;
0x05 EVT_KILL 2 
typedef struct {
	unsigned char opcode; /* 0x05 */
	unsigned char event;
} script_evt_kill_t;
0x06 If 4 
typedef struct {
	unsigned char opcode; /* 0x06 */
	unsigned char dummy;
	unsigned short block_length;
} script_if_t;
This structure is followed by one or several conditions for the if (condition) instruction. Any condition evaluated to false will end the if () block.
0x07 Else 4 
typedef struct {
	unsigned char opcode; /* 0x07 */
	unsigned char dummy;
	unsigned short block_length;
} script_else_t;
Note: it's either If/Endif, or If/Else; there is no If/Else/Endif sequence.
0x08 EndIf 2
0x09 Sleep 1
0x0a Sleeping 3 Sleep for N game ticks 
typedef struct {
	unsigned char opcode; /* 0x0a */
	unsigned char ticks; /* Number of game ticks to sleep */
	unsigned char unknown;
} script_sleep_t;
0x0b SleepW 1
0x0c SleepingW 1
0x0d For 6 
typedef struct {
	unsigned char opcode; /* 0x0d */
	unsigned char dummy;
	unsigned short block_length;
	unsigned short count;	/* Number of times to execute the loop */
} script_for_t;
0x0e ? 5
0x0f EndFor 2

0x10-0x1f

Byte Instruction Length Description
0x10 While 4 
typedef struct {
	unsigned char opcode; /* 0x10 */
	unsigned char dummy;
	unsigned short block_length;
} script_while_t;
This structure is followed by one or several conditions for the while (condition) instruction. Any condition evaluated to false will end the while () block.
0x11 EndWhile 2
0x12 Do 4 
typedef struct {
	unsigned char opcode; /* 0x12 */
	unsigned char dummy;
	unsigned short block_length;
} script_do_t;
0x13 EndDo 2 This structure is followed by one or several conditions for the do { } while (condition) instruction. Any condition evaluated to false will end the while () block.
0x14 Switch 4 
typedef struct {
	unsigned char opcode; /* 0x14 */
	unsigned char unknown0;
	unsigned char unknown1;
	unsigned char dummy;
} script_switch_t;
0x15 Case 2 
typedef struct {
	unsigned char opcode; /* 0x15 */
	unsigned char dummy;
} script_case_t;
This structure is followed by the condition to evaluate (See instruction 0x4c or 0x4e for example).
0x16 Default 2
0x17 EndSwitch 2
0x18 Goto 6
0x19 Call 2 
typedef struct {
	unsigned char opcode; /* 0x19 */
	unsigned char func_number; /* Function number of the script to call */
} script_call_t;
0x1a Return 4
0x1b Break 2
0x1c Breakpoint 1
0x1d EVAL_CC 4
0x1e Set 4 
typedef struct {
	unsigned char opcode; /* 0x1e */
	unsigned char object;
	unsigned short value;
} script_set1e_t;
0x1f Set 4

0x20-0x2f

Byte Instruction Length Description
0x20 CALC_OP 6 Math operation on accumulator 
typedef struct {
	unsigned char opcode; /* 0x20 */
	unsigned char dummy;
	unsigned char op;	/* 0x00: ADD, 0x01: SUB, 0x04: MODULO, 0x05: OR, 0x06: AND, 0x07: XOR */
	unsigned char accum_id;
	short value;
} script_calc_op_t;
0x21 ? 4
0x22 EVT_CUT 4
0x23 ? 1
0x24 CHASER_EVT_CLR 2
0x25 MAP_OPEN 4
0x26 POINT_ADD 6
0x27 DOOR_CK 1
0x28 DIEDEMO_ON 1
0x29 DIR_CK 8
0x2a PARTS_SET 6
0x2b VLOOP_SET 2
0x2c OTA_BE_SET 4
0x2d LINE_BEGIN 4
0x2e LINE_MAIN 6
0x2f LINE_END 2

0x30-0x3f

Byte Instruction Length Description
0x30 LIGHT_POS_SET 6
0x31 LIGHT_KIDO_SET 6
0x32 LIGHT_COLOR_SET 6
0x33 AHEAD_ROOM_SET 4 
typedef struct {
	unsigned char opcode; /* 0x33 */
	unsigned char dummy;
	unsigned short value;
} script_ahead_room_set_t;
0x34 ESPR_CTR 10
0x35 EVAL_BGM_TBL_CK 6
0x36 ITEM_GET_CK 3
0x37 OM_REV 2
0x38 CHASER_LIFE_INIT 2
0x39 PARTS_BOMB 16
0x3a PARTS_DOWN 16
0x3b CHASER_ITEM_SET 3
0x3c WEAPON_CHG_OLD 1
0x3d SEL_EVT_ON 2
0x3e ITEM_LOST 2
0x3f FLOOR_SET 3 
typedef struct {
	unsigned char opcode; /* 0x3f */
	unsigned char id;	/* Number of floor */
	unsigned char value;	/* 0x00: off, 0x01: on */
} script_floor_set_t;

0x40-0x4f

Byte Instruction Length Description
0x40 MEMB_SET 4
0x41 MEMB_SET2 3 Save accumulator in variable 
typedef struct {
	unsigned char opcode; /* 0x41 */
	unsigned char num_variable;
	unsigned char accum_id;
} script_calc_save_t;
0x42 MEMB_CPY 3 Load variable value into an accumulator 
typedef struct {
	unsigned char opcode; /* 0x42 */
	unsigned char accum_id;
	unsigned char num_variable;
} script_calc_load_t;
0x43 MEMB_CMP 6
0x44 MEMB_CALC 6
0x45 MEMB_CALC2 4
0x46 FADE_SET 11 
typedef struct {
	unsigned char opcode; /* 0x46 */
	unsigned char unknown[10];
} script_fade_set_t;
0x47 WORK_SET 3 
typedef struct {
	unsigned char opcode; /* 0x47 */
	unsigned char unknown;
	unsigned char object;
} script_work_set_t;
0x48 SPD_SET 4
0x49 ADD_SPD 1
0x4a ADD_ASPD 1
0x4b ADD_VSPD 1
0x4c EVAL_CK 4 Check flag 
typedef struct {
	unsigned char opcode; /* 0x4c */
	unsigned char flag;	/* Flag to check */
	unsigned char object;	/* Object in which to check flag */
	unsigned char value;	/* 0x00: off, 0x01: on */
} script_condition_ck_t;
0x4d SET 4 
typedef struct {
	unsigned char opcode; /* 0x4d */
	unsigned char flag;	/* Flag */
	unsigned char object;	/* Object */
	unsigned char value;	/* 0x00: off, 0x01: on */
} script_set_t;
0x4e EVAL_CMP 6 Evaluate a comparison. 
typedef struct {
	unsigned char opcode; /* 0x4e */
	unsigned char dummy;
	unsigned char variable;	/* Variable to compare */
	unsigned char func;	/* Comparison function */
		/* 0x00: EQ, 0x02: GE, 0x05: NE */
	unsigned short value;	/* Value to compare */
} script_condition_cmp_t;
0x4f RND 1

0x50-0x5f

Byte Instruction Length Description
0x50 CUT_CHG 2 In a cutscene, change camera angle. 
typedef struct {
	unsigned char opcode; /* 0x50 */
	unsigned char camera;	/* New camera angle to use */
} script_cut_chg_t;
0x51 CUT_OLD 1
0x52 CUT_AUTO 2
0x53 CUT_REPLACE 3
0x54 CUT_BE_SET 4
0x55 POS_SET 8 
typedef struct {
	unsigned char opcode; /* 0x55 */
	unsigned char dummy;
	short x,y,z;	/* Position */
} script_pos_set_t;
0x56 DIR_SET 8 
typedef struct {
	unsigned char opcode; /* 0x56 */
	unsigned char dummy;
	short x,y,z;	/* Direction */
} script_dir_set_t;
0x57 SET_VIB0 6
0x58 SET_VIB1 6
0x59 SET_VIB_FADE 8
0x5a RBJ_SET 2
0x5b MESSAGE_ON 6 
typedef struct {
	unsigned char opcode; /* 0x5b */
	unsigned char id;	/* Message id */
	unsigned short unknown[2];
} script_message_on_t;
0x5c RAIN_SET 2
0x5d MESSAGE_OFF 1
0x5e SHAKE_ON 3
0x5f WEAPON_CHG 2

0x60-0x6f

Byte Instruction Length Description
0x60 ? 22
0x61 DOOR_SET 32
0x62 DOOR_AOT_SET_4P 40
0x63 AOT_SET 20 Message ? 
typedef struct {
	unsigned char opcode; /* 0x63 */
	unsigned char event_type;
	unsigned char event_flag;
	unsigned char unknown0[3];
	short x,y,w,h;
	short unknown1[3];	/* unknown1[1] can be result of calling a function */
} script_aot_set_t;
0x64 AOT_SET_4P 28
0x65 AOT_RESET 10 
typedef struct {
	unsigned char opcode; /* 0x65 */
	unsigned char event_type;
	unsigned char event_flag;
	unsigned char unknown[7];
} script_aot_reset_t;
0x66 AOT_ON 2
0x67 ITEM_AOT_SET 22
0x68 ITEM_AOT_SET_4P 30
0x69 KAGE_SET 14
0x6a SUPER_SET 16 
typedef struct {
	unsigned char opcode; /* 0x6a */
	unsigned char unknown[15];
} script_super_set_t;
0x6b KEEP_ITEM_CK 2
0x6c KEY_CK 4
0x6d TRG_CK 4
0x6e SCA_ID_SET 4
0x6f OM_BOMB 2

0x70-0x7f

Byte Instruction Length Description
0x70 ESPR_ON 16 
typedef struct {
	unsigned char opcode; /* 0x70 */
	unsigned char unknown0[5];
	short unknown1[5];
} script_espr_on_t;
0x71 ESPR_ON2 18
0x72 ESPR3D_ON 22
0x73 ESPR3D_ON2 24 
typedef struct {
	unsigned char opcode; /* 0x73 */
	unsigned char unknown[23];
} script_espr3d_on2_t;
0x74 ESPR_KILL 5
0x75 ESPR_KILL2 2 
typedef struct {
	unsigned char opcode; /* 0x75 */
	unsigned char unknown;
} script_espr_kill2_t;
0x76 ESPR_KILL_ALL 3
0x77 SE_ON 12 
typedef struct {
	unsigned char opcode; /* 0x77 */
	unsigned char sound_type;
	unsigned char unknown[10];
} script_se_on_t;
0x78 BGM_CTL 6 
typedef struct {
	unsigned char opcode; /* 0x78 */
	unsigned char unknown[5];
} script_bgm_ctl_t;
0x79 XA_ON 4
0x7a MOVIE_ON 2
0x7b BGM_TBL_SET 6
0x7c STATUS_ON 1
0x7d EM_SET 24 Entity model (enemy, other character) 
typedef struct {
	unsigned char opcode; /* 0x7d */
	unsigned char unknown0[11];
	short x,y,z, dir;
	unsigned short unknown1[2];
} script_em_set_t;
0x7e MIZU_DIV 2
0x7f OM_SET 40 Object model (pickable item) 
typedef struct {
	unsigned char opcode; /* 0x7f */
	unsigned char unknown[39];
} script_om_set_t;

0x80-0x8f

Byte Instruction Length Description
0x80 PLC_MOTION 4
0x81 PLC_DEST 8 
typedef struct {
	unsigned char opcode; /* 0x81 */
	unsigned char dummy;
	unsigned char unknown0[2];
	unsigned short unknown1[2];
} script_plc_dest_t;
0x82 PLC_NECK 10 
typedef struct {
	unsigned char opcode; /* 0x82 */
	unsigned char unknown0;
	unsigned short unknown1[3];
	unsigned char unknown2[2];
} script_plc_neck_t;
0x83 PLC_RET 1
0x84 PLC_FLG 4
0x85 PLC_GUN 2
0x86 PLC_GUN_EFF 1
0x87 PLC_STOP 1
0x88 PLC_ROT 4
0x89 PLC_CNT 2 
typedef struct {
	unsigned char opcode; /* 0x89 */
	unsigned char unknown0;
} script_plc_cnt_t;
0x8a SPLC_RET 1
0x8b SPLC_SCE 1
0x8c PLC_SCE 1
0x8d SPL_WEAPON_CHG 1
0x8e PLC_MOT_NUM 4
0x8f EM_RESET 2

Offset 17, execution script

This script is run regularly to update stuff in current room. It follows same structure as the one at offset 16.

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