A Child Group references its Parent"s Position. The Origin of the Child Group is located by default at the center of the Parent"s Position.
Position Rules have the following syntax:
{ origin: p(x, y, z),
xdir: v(x, y, z),
ydir: v(x, y, z),
}
where:
p(x,y,z) indicates the origin point with regard to the parent
xdir: v(x,y,z) indicates the vector of x direction with regard to the parent
ydir: v(x,y,z) indicates the vector of y direction with regard to the parent
We call this position syntax a "position spec."
•xdir and ydir are optional. You can just specify the origin if you don’t need an orientation change.
•There are more details to position specs that will be covered in a later unit. This is the most basic syntax.
