John Denker wrote: > On 08/17/2008 10:01 AM, Ron Jensen wrote: > >>> This particular patch was greatly discussed > > Yes, it was greatly discussed. > >>> and the decision was made >>> not to include it in the main code base. > > There was no consensus on that point. > That's my reading of the discussion, but in any event, I didn't mean to imply that this was a patch I would be committing straight away, just that it wouldn't merge with current CVS because the texture animation code has changed to use expressions.
Tim >>> The <bias> tag was added as >>> the fix for this "problem". > > There was no consensus that the <bias> tag made much sense. Here is > a good summary of the discussion: > > > On 03/09/2007 01:18 PM, Jim Wilson wrote: >> Hi Everybody, >> >> >> Just to clarify, I wrote the textranslate and texrotate animations >> (they are animations) while doing the displays for the 747. They are >> for sliding and rotating texture mappings on an 3D object, and have >> nothing per se to do with digits. The first problem I was trying to >> solve was sliding the ASI and Altitude tapes on the PFD. Then it was >> the rose animation. >> >> The problem of producing the alpha and digital displays (it was never >> about "numbers") had been dogging me, and in the end I never got >> around to really solving the issue. It just so happend that I was >> able to use the texture translation for placing numeric values by >> creating a texture that had a bunch of digits and sliding it around. >> By adding the step parameter I was able to make it either scroll >> smoothly like the altitude value or just snap the digit in place as >> on most digital displays. IIRC the IAS display also has a sort of >> odometer "drum" behavior even though it is a flat electronic display. >> Note that the animations were also used for displaying some >> alphanumeric NAV data. >> >> Essentially, I'm saying that Andy was right. Also, there really was >> no intention to handle fractional numeric values or digits for that >> matter. It just happened that other modelers picked up on the >> technique, as there was no other method available, and it went quite >> a bit farther than was ever intended. >> >> In that context, the addition of the bias tag doesn't really make a >> whole lot of sense, but if it helps someone out, that's fine. These >> functions are a useful way to do all kinds of things with sliding and >> rotating textures, but they are a very cumbersome way of doing >> alphanumeric data displays. > > I agree with Jim Wilson and Andy Ross that the <bias> tag doesn't > make a whole lot of sense. If you want to use it, go ahead, but > don't pretend it "fixes" the problem ... and don't use it as a > pretext for derailing efforts to really fix the problem. > > The only thing that really makes sense is to implement a set of > formatting directives that is actually suitable for digits. > *) This will make the code for digit displays much much more > compact. Writing the code will be less laborious and less > error-prone. > *) Then textranslate can be restricted to its intended purpose, > namely tapes and drums. > *) Beware that real instruments /round/ some things and then > /truncate/ other things, so a one-size-fits-all approach will > not work, as I pointed out a year and a half ago. The formatting > directives will need to include some things that are documented > to do rounding (such as sprintf) and some things that are documented > to do truncation (such as substr). > > > ------------------------------------------------------------------------- > This SF.Net email is sponsored by the Moblin Your Move Developer's challenge > Build the coolest Linux based applications with Moblin SDK & win great prizes > Grand prize is a trip for two to an Open Source event anywhere in the world > http://moblin-contest.org/redirect.php?banner_id=100&url=/ > _______________________________________________ > Flightgear-devel mailing list > Flightgear-devel@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/flightgear-devel > ------------------------------------------------------------------------- This SF.Net email is sponsored by the Moblin Your Move Developer's challenge Build the coolest Linux based applications with Moblin SDK & win great prizes Grand prize is a trip for two to an Open Source event anywhere in the world http://moblin-contest.org/redirect.php?banner_id=100&url=/ _______________________________________________ Flightgear-devel mailing list Flightgear-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/flightgear-devel
