DragonWhisperer Posted August 30, 2011 Share Posted August 30, 2011 I know llWind returns a vector from which llVecMag, or your own math, can be used to determine the wind's strength, but what range of magnitudes will SL generate?I'm working on something that will react based on wind magnitude and need to know what the average SL wind speed is and to what extreme magnitude values my code should consider.Adding this info to the LSL functionh description page would be nice too. Link to comment Share on other sites More sharing options...
Rolig Loon Posted August 30, 2011 Share Posted August 30, 2011 The only way we ever know things like that is when someone sits down and does an experiment. Tag, you're it. :smileytongue: Link to comment Share on other sites More sharing options...
Void Singer Posted August 30, 2011 Share Posted August 30, 2011 no clue, but the weather page contains quotes from Andrew Linden, who seems fairly familiar with the implementation, so he'd be the one to ask.... I believe he still holds weekly office hours Link to comment Share on other sites More sharing options...
Cid Jacobs Posted August 30, 2011 Share Posted August 30, 2011 I did a lot of experiments on wind years ago, and as far as I know it still uses the same Jos Stam's Navier-Stokes equations. Over the course of several months the fastest wind I ever recorded, while polling every 15 minutes or so in multiple locations, was 31.800045 MPS, the slowest was 0.000440 MPS. I believe their is some pseudo-math to cap the maximum value for wind at 32 MPS to keep the wind from becoming unstable, this is based solely on interactions with Andrew Linden where he said that he was not "100% sure." 1 Link to comment Share on other sites More sharing options...
PeterCanessa Oh Posted August 30, 2011 Share Posted August 30, 2011 Cid Jacobs wrote: Over the course of several months ... polling every 15 minutes or so in multiple locations Sounds pretty definitive to me! Well done, it's always good to find someone who's actually done the research and compiled the figures. Link to comment Share on other sites More sharing options...
Rolig Loon Posted August 30, 2011 Share Posted August 30, 2011 Very nicely done. Would you put that info on the llWind wiki page? Link to comment Share on other sites More sharing options...
DragonWhisperer Posted August 31, 2011 Author Share Posted August 31, 2011 Thanks for sharing your research, Cid. Exactl what I needed...almost. What would you gather an average wind speed might be based on your research? Link to comment Share on other sites More sharing options...
Cid Jacobs Posted August 31, 2011 Share Posted August 31, 2011 I think most of the weather info on the wiki page is already authored by me, and I doubt anyone would be interested in raw data. The numbers appear random, but actually use the equations I mentioned before, just on a much larger scale. And I have not put the minimum and maximum just because it has not been "100%" verified yet. If someone can get Andrew to confirm that it is capped at 32, that would be great. Right now I am only 99.9% sure it is. Link to comment Share on other sites More sharing options...
Cid Jacobs Posted August 31, 2011 Share Posted August 31, 2011 As for the average, it really was fairly random, but usually it would hit large "patches" in the 8MPS range for a while, and in the 15MPS range for a while, but this may have been due to pseudo random number generation rather than any sort of pattern. Link to comment Share on other sites More sharing options...
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