A point represents both, a spatial coordinate as well as an angular orientation on stage. This dual nature stems from the close ties with the TUIO protocol itself.
<x>: specifies the position in horizontal direction. Defaults to 0 if omitted.
<y>: specifies the position in vertical direction. Defaults to 0 if omitted.
<z>: specifies the angular orientation either in degrees (suffix
deg) or radiants (default, optional suffix
rad). Defaults to 0 if omitted. You may also use the tags
unitattribute to specify the angular unit
<state>: specifies the coordinate system that the offset is expressed in. Possible values are:
- ScreenCoordinates: coordinates are expressed in pixels.
- CameraCoordinates: coordinates are expressed in normalized camera coordinates, i.e. coordinate in the range 0 <= coordinate <= 1. Default
- TableCoordinates: coordinates are expressed in millimeters.
When talking about coordinates it is important to know what the reference system looks like. The TULIP coordinates system uses the same convention as the one used by the TUIO protocol itself.