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Index › Programming Questions & Help › OpenGL and 3D Libraries › A right handed, Z "up" coord sys
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A right handed, Z "up" coord sys (Read 615 times)
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A right handed, Z "up" coord sys
May 13th, 2006, 7:57am  
Processing uses a left handed coordinate system, with XY being the 2D plane, and Z being out of the plane toward the viewer.

How would I convert this to a right handed system?  Can I simply do a scale(1,-1,1) to flip the Y axis?  Or scale(1,1,-1) to flip the Z axis?  Presumably I could then rotateX(radians(+/-90)) to get the Z axes pointed "up", right?

And if I do this, will it confuse camera/view systems like OCD which calculates azimuth from the X axis and elevation from the XZ plane?

Sorry to be dumb on this but its a bit confusing!

Owen
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mflux
Re: A right handed, Z "up" coord sys
Reply #1 - May 13th, 2006, 10:31pm  
All of the methods above will do what you describe (scale(1,-1,1) will flip Y, scale(1,1,-1) will flip Z).

And yes, I am fairly certain it will confuse OCD. However OCD provides you with a nice camera-up axis setting so you can set the orientation however you want!

Check out the documentation for OCD (look for its constructors).

Good luck.
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