Path: csiph.com!x330-a1.tempe.blueboxinc.net!newsfeed.hal-mli.net!feeder1.hal-mli.net!border3.nntp.dca.giganews.com!Xl.tags.giganews.com!border1.nntp.dca.giganews.com!nntp.giganews.com!local2.nntp.dca.giganews.com!nntp.posted.palinacquisition!news.posted.palinacquisition.POSTED!not-for-mail NNTP-Posting-Date: Fri, 01 Apr 2011 19:51:17 -0500 Date: Fri, 01 Apr 2011 17:51:14 -0700 From: Peter Duniho User-Agent: Mozilla/5.0 (Macintosh; U; Intel Mac OS X 10.5; en-US; rv:1.9.2.13) Gecko/20101207 Thunderbird/3.1.7 MIME-Version: 1.0 Newsgroups: comp.lang.java.programmer Subject: Re: Android Sensor Coordinates References: In-Reply-To: Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Message-ID: Lines: 26 X-Usenet-Provider: http://www.giganews.com NNTP-Posting-Host: 50.46.118.188 X-Trace: sv3-ZQnDzey7pYyr+hJMqQH9TpUUDCTJXUhICp+DjnmDineK2hU6bAoUGBrj5hkZj2Tq/XBTnD0gFS4Nwn2!eTAkvEUGmelGe+ZJrPIdW7A2qTehfJOKPWVezSnr6i9lKBpY7Y+Y6M+tJGGfEJlkKkcG1rAjitha!y+KsxQT2xfaXZgDiyB7GTEgjxOA7wo1LjPgM/G3nHbU= X-Complaints-To: abuse@iinet.com X-DMCA-Complaints-To: abuse@iinet.com X-Abuse-and-DMCA-Info: Please be sure to forward a copy of ALL headers X-Abuse-and-DMCA-Info: Otherwise we will be unable to process your complaint properly X-Postfilter: 1.3.40 X-Original-Bytes: 2421 Xref: x330-a1.tempe.blueboxinc.net comp.lang.java.programmer:2705 On 4/1/11 11:02 AM, BGB wrote: > [...] > although... > > with the information provided thus far, once could still infer tilt via > the accelerometer... Absolutely. The information is there. It's just not being presented as such. If you make an assumption about the accelerometer-equipped device as a whole not being accelerated, and further assume that it's being used on the surface of the planet, the constant acceleration due to gravity provides a frame of reference from which tilt can be inferred from the observed acceleration. One can even filter the data (similar to seen in the documentation) to attempt to determine tilt from a device that is in fact being subject to some other (relatively constant) acceleration. But, all that inference comes at a price, both computationally and in precision. There's a reason that the Wiimote, in spite of having a reasonably accurate three-axis accelerometer, derives partial tilt information from the IR transmitter bar instead. ObJava: sorry, what? Pete