/usr/share/radiance/page2.txt is in radiance-materials 4R0+20110410-1build1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 | be read by the program getinfo.
2. Scene Description
A scene description file represents a three-dimensional
physical environment in Cartesian (rectilinear) world coor-
dinates. It is stored as ascii text, with the following
basic format:
# comment
modifier type identifier
n S1 S2 S3 ... Sn
0
m R1 R2 R3 ... Rm
! command
...
A comment line begins with a pound sign, `#'.
The scene description primitives all have the same gen-
eral format, and can be either surfaces or modifiers. A
primitive has a modifier, a type, and an identifier. A
modifier is either the identifier of a previously defined
primitive, or void. An identifier can be any string (ie.
sequence of non-blank characters). The arguments associated
with a primitive can be strings or real numbers. The first
integer following the identifier is the number of string
arguments, and it is followed by the arguments themselves.
The next integer is the number of integer arguments, and is
followed by the integer arguments. (There are currently no
primitives that use them, however.) The next integer is the
real argument count, and it is followed by the real argu-
ments.
A line beginning with an exclamation point, `!', is
interpreted as a command. It is executed by the shell, and
its output is read as input to the program. The command
must not try to read from its standard input, or confusion
will result.
Blank space is generally ignored, except as a separa-
tor. The exception is the newline character after a command
or comment. Commands, comments and primitives may appear in
any combination, so long as they are not intermingled.
2.1. Primitive Types
Primitives can be surfaces, materials, textures or pat-
terns. Materials modify surfaces, textures and patterns
modify textures, patterns and materials.
2.1.1. Surfaces
A scene description will consist mostly of surfaces.
The basic types are given below.
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