Re: Office Space ;) and coordinate systems
Robert.Foster@radiology.msu.edu
Fri, 9 Sep 94 15:36:16 EDT
:: From: unitcirc@netcom.com (Kevin Goldsmith)
:: Subject: Re: Office Space ;) and coordinate systems
:: To: Robert.Foster@radiology.msu.edu
:: Date: Fri, 2 Sep 1994 22:48:22 -0700 (PDT)
::
:: >
:: > By automatic scaling I meant that a person`s `current` VR environment
:: > would have a particular scale based on a metric unit such as a meter.
:: > When you link to another VR `location`, or import a VR object, the scale
:: > of the new object/location should be available via VRML. If the new object
:: > is say 1 meter by 1 meter by 1 meter then it would be placed visually so
:: > that it's size corresponds to the same area in your current environment.
:: > Moving to a new location would cause a change in the current scale.
:: >
:: this would not be an issue if there was a standard scale (1 unit
:: = 1 meter) and all objects were in those units. (or at least looked like
:: they were in those units to the rest of the world).
::
:: Kevin
::
In cartography, once you place a scale on a map, it is accurate even if
enlarged or reduced since the map is reduced or enlarged along with the
scale bar on the map. At the same time a scale notation must be on the
map to indicate what one segment of the scale represents. Such a notation
is all that would be necessary as one item of the VRML object definition
passed in a transaction. Example:
-This object has units equal to one meter-
Scaling would depend on views, behaviours, etc. which would see the
indicated scale and adjust the view to correspond to the current scale
in the viewer/browser/gui environment.
The standard scale that you refer to is simply a unit of measure in
the object itself.
Robert K. Foster
Analyst / Designer / Programmer
Mid-Michigan MRI, Inc., Lansing, MI, USA
rkf@rad.msu.edu