Re: [Plib-users] doubts about the struct sgCoords

[Steve B. <sjb...@ai...>]

Andreia R de Assuncao Schneider wrote:
> Hi,
> I'd like to know what is the meaning of the parameters passed to the 
> struct sgCoords (x,y,z and p,h,r).
> As far as I know, x,y,z are the parametes of the translation and the 
> rotation is executed before the translation, but I dont't understand what 
> p, r, z mean...
xyz is the translation (positive Z is up, X is to the right, Y is forwards)
and hpr is the rotation.

  h == Heading (rotation about the Z axis)
  p == Pitch   (rotation about the X axis)
  r == Roll    (rotation about the Y axis).

Some people use the word 'Yaw' instead of 'Heading' - but Yaw begins
with a 'Y' and it gets confused with the Y axis.

The array indices go in the same order as the letters, so hpr[0]
is heading, hpr[1] is pitch and hpr[2] is roll.
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