global coords 
Author Message
 global coords

Is it possible to define placement of objects in a world using a global
coord system? Help would be much appreciated.

regards

Steve Carney



Wed, 08 Jan 2003 03:00:00 GMT  
 global coords

Quote:

> Is it possible to define placement of objects in a world using a global
> coord system? Help would be much appreciated.

Yes. ;)

Each object in vrml can have has its own set of coordinates (a lot of
modelers create objects centered on 0,0,0). Any good scene-assembly
program will place those objects inside Transform nodes. The Translation
field of the Transform will allow translating the child or children
anywhere in the global coordinate system. The Rotation field allows
rotating the object(s). [If the child is not centered on 0,0,0, you can
compensate with the Center field of the Transform]

The coordinate system is X="Left-Right, positive to right", Y="Up-Down,
positive Up", Z="Forward-Back, positive toward viewer". Rotations are
measured in vectors based on right-hand-rule rotation around each axis.
(Point thumb of right hand in direction of positive axis, curl fingers,
and direction of finger curl represents positive rotation direction.)

- Paul
***********************************
Paul S. Hoffman
Senior Interface Designer, Cognetics Corporation

Company URL - http://www.cognetics.com
Personal URL - http://pluto.njcc.com/~paulsam
609-799-5005 ext.237 - FAX 609-799-8555



Wed, 08 Jan 2003 03:00:00 GMT  
 global coords

Quote:

> Is it possible to define placement of objects in a world using a global
> coord system? Help would be much appreciated.

Yes. ;)

Each object in VRML can have has its own set of coordinates (a lot of
modelers create objects centered on 0,0,0). Any good scene-assembly
program will place those objects inside Transform nodes. The Translation
field of the Transform will allow translating the child or children
anywhere in the global coordinate system. The Rotation field allows
rotating the object(s). [If the child is not centered on 0,0,0, you can
compensate with the Center field of the Transform]

The coordinate system is X="Left-Right, positive to right", Y="Up-Down,
positive Up", Z="Forward-Back, positive toward viewer". Rotations are
measured in vectors based on right-hand-rule rotation around each axis.
(Point thumb of right hand in direction of positive axis, curl fingers,
and direction of finger curl represents positive rotation direction.)

- Paul
***********************************
Paul S. Hoffman
Senior Interface Designer, Cognetics Corporation

Company URL - http://www.cognetics.com
Personal URL - http://pluto.njcc.com/~paulsam
609-799-5005 ext.237 - FAX 609-799-8555



Wed, 08 Jan 2003 03:00:00 GMT  
 global coords
    If by global you mean UTM or long./lat. type coords have a look at:
http://www.geovrml.org


Quote:
> Is it possible to define placement of objects in a world using a global
> coord system? Help would be much appreciated.

> regards

> Steve Carney



Sun, 12 Jan 2003 03:00:00 GMT  
 
 [ 4 post ] 

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