Each line of a text file describes a single object or specific scene property and can have the following format:

IDENTIFIER OBJ_ID OBJ_TYPE_IDENT OBJ_TYPE OBJ_GEOM_IDENT OBJ_GEOM OBJ_MATERIAL_IDENT MATERIAL_ID OBJ_ACTIVITY_IDENT OBJECT_ACTIVITY OBJ_TIME_IDENT OBJECT_TIME OBJ_COORD_IDENT OBJECT_COORD …

Each line starts with one of the following indicators, which define the type of information stored in this line. There exist eight possible types of main identifiers:

IDENTIFIER	Description
0	Line with one of the physical objects (Particle, Wall, Solid bond, etc.)
22	Line with simulation domain (more information about simulation domain is given here )
25	Line with main description of a geometrical object
26	Line with time-dependent properties of specific geometrical object
27	Line with the number of planes and indexes of walls included into this geometry
28	Line with information about periodic boundary conditions
29	A flag indicating whether anisotropy of particles is taken into account during the simulation
30	A flag indicating whether particles have increased contact radius
32	Line with compound
33	Line with compound interaction
34	Line with compound mixture
38	Line with information about analysis volume
39	Line with main description of package generator
40	Line with additional configuration of package generator
41	Line with description of bonds generator

Each line starting with the main identifier equal to 0 contains complete information about a particular physical object. This information is separated by internal identifiers (marked as blue) and for all objects have a similar format:

Information about a sphere:
0 | OBJ_ID 1 1 5 RADIUS CONTACT-RADIUS 23 MATERIAL_ID 24 START_ACTIV END_ACTIV 2 TP_1 16 ANGL_VEL 12 COORD 20 FORCE 18 FORCE_AMPL 31 ORIENTATION 42 PRINC_STRESS 36 STRESS_TENSOR 37 TEMPERATURE 15 VEL 2 TP_2 …

Information about a solid bond:
0 | OBJ_ID 1 9 5 ID1 ID2 DIAMETER INIT_LENGTH 23 MATERIAL_ID 24 START_ACTIV END_ACTIV 2 TP_1 12 COORD 20 FORCE 18 FORCE_AMPL 45 TANG_OVERLAP 37 TEMPERATURE 43 TOT_TORQUE 15 VEL 2 TP_2 …

Information about a wall:
0 | OBJ_ID 1 14 5 _ 23 MATERIAL_ID 24 START_ACTIV END_ACTIV2 TP_1 44 PLANE_COORD 20 FORCE 18 FORCE_AMPL 15 VEL 2 TP_2 …

Lines that do not start from 0 describe specific properties of the scene and have the following format:

Information about the simulation domain:

22 | coordMin coordMax

Information about a geometrical object:

25 GeometryName GeometryKey Mass FreeMotionX FreeMotionY FreeMotionZ RotateAroundCenterFlag

26 | Time-dependent velocity properties

27 | NumberOfPlanes IndexesOfPlanesInTheGeometry

Information about boundary conditions:

28 | Boundary conditions

Information about anisotropy:

29 | Flag

Information about contact radius:

30 | Flag

Information about materials:

32 | compound_key compound_name 0 density 2 dynamic_viscosity 7 young_modulus 8 normal_strength 9 tangential_strength 10 poisson_ratio 11 surface_energy 12 atomic_volume 13 surface_tension 14 time_therm_exp_coeff 15 yield_strength

33 | compound_key_1 compound_key_2 200 restitution_coefficient 201 static_friction 202 rolling_friction |

34 | mixture_key mixture_name 0 compound diameter contact_diameter fraction 1 compound diameter contact_diameter fraction 2 …

Table 2. Description of properties.

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ID	Name	Value	Description
Time-independent data:
	OBJ_ID	ID	Unique identifier of the object
1	OBJ_TYPE	1	Sphere
		9	Solid bond
		14	Triangular wall
5	OBJ_GEOM	R, CR	Radius and contact radius of a sphere
		ID1, ID2, D, L	Unique identifiers of connected particles, diameter and initial length of a solid bond
		-	Triangular wall
23	MATERIAL_ID	key	Material identifier of an object
24	START_ACTIV END_ACTIV	t1 t2	Two time points which define activity interval of an object
Time-dependent data:
2	TP_X	t	New time point
12	COORD	X Y Z	Object coordinates
15	VEL	X Y Z	Velocity
16	ANGL_VEL	X Y Z	Angular velocity
18	FORCE_AMPL	F	Magnitude of force (for bonds can be negative)
20	FORCE	X Y Z	Vector of force
31	ORIENTATION	q0 q1 q2 q3	Quaternion of orientation
36	STRESS_TENSOR	t[0][0] t[0][1] t[0][2] t[1][0] t[1][1] t[1][2] t[2][0] t[2][1] t[2][2]	Stress tensor of particles
37	TEMPERATURE	T	Temperature of object
42	PRINCIPAL_STRESS	X Y Z	Principal stress
43	TOT_TORQUE	X Y Z	Total torque
44	PLANE_COORD	X1 Y1 Z1 X2 Y2 Z2 X3 Y3 Z3	Corrdinates of each vertex of a wall
45	TANG_OVERLAP	X Y Z	Vector of tangential overlap

Examples:
Several examples of text files are given in the MUSEN installation folder at PathToMUSEN\Examples\InitScenes\.