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I have a clause from DirectX SDK as below:

The position, velocity, and orientation of sound sources and listeners in 3D space are represented by Cartesian coordinates

what's the range of world position, velocity and orientation? do they decorate only sound sources? or they decorate listeners too?

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Do you perhaps mean "do they modify"? ... If so, it's the other way round: all three appear (by ordinary rules of English syntax) to be modified by "of sources" and "[of] listeners". –  StoneyB Oct 12 '12 at 20:31
    
Yes, I mean modify, thanks. –  zdd Oct 13 '12 at 0:46

1 Answer 1

up vote 1 down vote accepted

Using mathematical parenthesis to clarify, the sentence can be broken up as follows:

The (position, velocity, and orientation) of (sound sources and listeners) in 3D space are represented by Cartesian coordinates

Therefore:

  • the position, velocity and orientation of sound sources are represented by Cartesian co-ordinates.
  • the position, velocity and orientation of listeners are represented by Cartesian co-ordinates.

I personally would have written it like this:

Cartesian co-ordinates are used to represent the position, velocity and orientation in 3D space of both sound sources and listeners.

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