Double Precision in 2.0?
Gary Williams (gewillia++at++afit.af.mil)
Thu, 8 Feb 1996 16:37:01 EDT
I've been continuing work on a virtual Solar System Modeler which accurately
propagates the orbits of the planets, moons, man-made satellites, etc. We're
experiencing some difficulties with jitter in the moons and satellites in the
outer planet regions. The coordinate system is based on the Earth's location
so the numbers get pretty large. The calcuations must be precise and I suspect
our problem may be due to the mixing of doubles and floats (pfVec3, etc) in
Performer 1.2. I've been told Performer 2.0 was to support double precision in
its internal data structures. However, it appeared to me the pfVec3 and related
structures are still only floats (I looked at the pfLinMath.h file). I've
briefly looked at the FAQ page and the manual but haven't found any helpful
information. Would someone please let me know if Peformer 2.0 does support
doubles in its data structures and an appropriate reference for reading up on
this. Thanks for any help you can provide.
Gary
******************************************************
GARY E. WILLIAMS, Capt, USAF
Air Force Institute of Technology
MS Student in Computer Systems: Modeling & Simulation
http://www.afit.af.mil/Schools/EN/ENG/LABS/GRAPHICS/people/gewillia/index.html
gewillia++at++afit.af.mil (513) 255-3636 Ext. 6036
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