The PDC file is used by Maya's particle
disk caching and startup cache. It is a binary file that holds one
frame's worth of data for a single particle object. The readpdb program
cannot read this format, but we provide this information here in
case you want to write your own readers.
4 Characters indicating
that this is a PDC file. These 4 characters are:
“P”,
“D”, “C”, “ “.
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1 Integer indicating
the file format version number.
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1 Integer holding bit
information about whether the values stored in the file are BIG_ENDIAN
or LITTLE_ENDIAN.
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2 Integers holding extra
bit information that various file format version might decide to
use.
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1 Integer indicating
the number of particles represented in this file.
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1 Integer indicating
the number of attributes that have values stored in this file.
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N records, where N is
the number of attributes. Each record holds all of the particles'
data. The record is formatted as follows:
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- 1 Integer indicating the length of the
attribute's name
- M Characters indicating the name of the
attribute, where M is the length of the name.
- 1 Integer indicating the type of data
for the current attribute. The following maps the values to the
data types:
- 0 ---> Integer
- 1 ---> Integer Array
- 2 ---> Double
- 3 ---> Double Array
- 4 ---> Vector
- 5 ---> Vector Array
- P * B Bytes representing the data for
this attribute, where P is the number of particles or 1 for non-array
data and B is the number of bytes needed to represent the data type.
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