Creating a geometry

The geometry used by the simulator consists of triangles with an inner and outer material.

Geometry file

Geometries are defined in text files consisting of lines with 9 columns:

mat_in mat_out Ax Ay Az Bx By Bz Cx Cy Cz

Each line describes a single triangle. mat_in and mat_out are integers material indices defining which material is inside (in the direction against the normal) and outside (in the direction with the normal) of the triangle. Ax through Cz are the x, y and z components of the vertices A, B and C of the triangle. The normal is defined as n = (B-A)⋅(C-A).

The materials mat_in and mat_out must be a 8-bit signed integer between -128 and 127. The values below zero have a special meaning. The numbers zero and above are materials.

ID	type
-128	NOP
-127	TERMINATOR
-126	DETECTOR
-125	DETECTOR_LT50
-124	DETECTOR_GE50
-123	VACUUM
-122	MIRROR
...	...
0	material 0
1	material 1
2	material 2
...	...
127	material 127

Create a geometry

Run bin/line-gen > geometry.tri to generate a sample geometry consisting of lines and spaced. Use the --help flag to see what options are available.