Only ASCII material files are supported. The default extension for the name of a material file is .mtr. Three main types of materials are supported: conductors, dielectrics, and scatterer.
[header] { [rest material] } <end>
The type of the file must be material. An empty material file, i.e., no [rest material] is contained, is allowed and can be used to reset all materials to the default material (perfect conductor).
[materials]
[material] | [materials]
[conductor] | [dielectric] | [scatterer]
<conductor> | <conductor> "material name"
Indicates a perfect conductor.
( <dielectric> | <dielectric> "material name" ) <{> <EPSILON> $float$:64 <COND> $float$:64 <RMS> $float$:64 <}>
The value for <EPSILON> is the relative dielectricity, the value for <COND> is the conductivity in [S], and the value for <RMS> the root mean square roughness in [m].
( <scatterer> | <scatterer> "material name" ) <{> <RCS> $float$:64 <}>
The value for <RCS> is the radar cross section.
The "material name" may be any name not containing newlines nor the character ", however, blanks and tabulators are allowed. Implicitly, the materials in the file get indexed according to the order they appear in the file.
Example of a material file:
radiotracer version 1 material ascii
conductor "conductor"
dielectric "code_21" { epsilon 3 cond 0.2 rms 0 }
scatterer "tree" { rcs 40 }
scatterer "pine" { rcs 30 }
end