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  Coordinate System  (Read 764 times)
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Offline williamsellick

Senior Newbie





« Posted 2006-02-07 13:36:58 »

Hi,

I have been wondering about the coordinate system used in xith and what the default setup is when you create a blank canvas. It
seems to me (from some small programs I have written) the default for the axis is objects appear on the x / z plane and the height
is the y axis. Is this the standard? From most of the things I have read about mathmatics it is general practise for objects to be on
the x / y plane and the height on the z axis. Is it just my examples or is this the default setup? if so why is it not implemented the
other way round?

Thanks
William
Offline arne

Senior Devvie




money is the worst drug- we should not let it rule


« Reply #1 - Posted 2006-02-07 14:07:42 »

It's simply a thing of definition. I for example use Xith3d and have z up, simply because I'm used to having z up.
And for a default setup you'll simply have to define it and this is the way xith3d developers decided to do it.
I would simply set the View-Position always at the beginning with View.getTransform().lookAt(), so you're independent on the default setup.

Arne

:: JOODE :: Xith3d :: OdeJava ::
Offline croft

Junior Devvie




Java, Java, Java


« Reply #2 - Posted 2006-02-07 17:39:47 »

I have been wondering about the coordinate system used in xith and what the default setup is when you create a blank canvas. It
seems to me (from some small programs I have written) the default for the axis is objects appear on the x / z plane and the height
is the y axis. Is this the standard? From most of the things I have read about mathmatics it is general practise for objects to be on
the x / y plane and the height on the z axis. Is it just my examples or is this the default setup? if so why is it not implemented the
other way round?

I found this but the graphs are not quite right:
http://en.wikipedia.org/wiki/Cartesian_coordinate_system#Orientation_and_.22handedness.22

By default, both Xith and COLLADA use a right-handed coordinate system with y up.

Perhaps this is graphed properly in the Java3D or Xith tutorial documentation?

David Wallace Croft / www.CroftSoft.com / (214) 636-3790 m / Advanced Java Game Programming
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