how long does llSetAlpha take to execute?
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Innula Zenovka
Registered User
Join date: 20 Jun 2007
Posts: 1,825
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05-11-2009 14:40
I'm trying to fade something in and out between alpha values of float max = 0.85 and float min = 0.0 using touch_start(integer total_number)
{
toggle =!toggle;
if(toggle){
counter = 0.0;
while(counter<max){
llSetAlpha(llGetAlpha(0)+increment,ALL_SIDES);
counter+=increment;
}
llSetAlpha(max, ALL_SIDES); //just to be on the safe side
}
else {
counter = max;
while(counter>min){
llSetAlpha(llGetAlpha(0)-increment,ALL_SIDES);
counter-=increment;
}
llSetAlpha(min, ALL_SIDES);//just to be on the safe side
}
} How, other than trial and error, should I calculate increment so as to get from max to min in x seconds? |
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Argent Stonecutter
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Join date: 20 Sep 2005
Posts: 20,263
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05-11-2009 15:02
llSetAlpha gets sent as prim state updates to the client, so how long it takes to take effect depends on the network latency, jitter, and bandwidth, and the bandwidth settings you're using.
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Strife Onizuka
Moonchild
Join date: 3 Mar 2004
Posts: 5,887
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05-11-2009 18:18
llSetAlpha also causes the script to sleep 0.1 seconds.
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Innula Zenovka
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Join date: 20 Jun 2007
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05-11-2009 20:07
Thanks, both.. I wasn't at all certain about whether it slept the script or not; it seems the sort of thing that should, but there's nothing in the tool-tip about it and the SL wiki specifically says it doesn't, so I wasn't sure.
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Sindy Tsure
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Join date: 18 Sep 2006
Posts: 4,103
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05-11-2009 20:27
From: Strife Onizuka llSetAlpha also causes the script to sleep 0.1 seconds. /me adds SVC-4244 before noticing that the wiki says there's no delay. I'm guessing this wiki is incorrect because llSetAlpha does a (full?) object update. https://jira.secondlife.com/browse/SVC-4244From: someone New llFunction to fade to/from transparent, please
It would be nice to have a new function that would cause a prim face to change to some desired % transparent over time. This would be a much nicer effect than the instant changes we get now and would be a easier than working around the forced .1 delay scripts have now.
Maybe something like llFade (integer face, integer desiredPercentTransparent, float seconds)
If it made it easier to implement, I think maxing the time to something under 10 seconds would be ok. Certainly under 1 minute.
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DrDoug Pennell
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Join date: 13 Mar 2007
Posts: 112
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05-13-2009 21:33
From: Sindy Tsure /me adds SVC-4244 before noticing that the wiki says there's no delay. I'm guessing this wiki is incorrect because llSetAlpha does a (full?) object update. https://jira.secondlife.com/browse/SVC-4244This is probably obvious, but in the mean time you can always script around the abruptness. while(alpha_num<=1) { llSetAlpha(alpha_num, ALL_SIDES); alpha_num=alpha_num-.01; } Doug |
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Argent Stonecutter
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05-14-2009 03:48
From: DrDoug Pennell This is probably obvious, but in the mean time you can always script around the abruptness.
while(alpha_num<=1)
{
llSetAlpha(alpha_num, ALL_SIDES);
alpha_num=alpha_num-.01;
}
Might take a while to finish there. |
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Viktoria Dovgal
…
Join date: 29 Jul 2007
Posts: 3,593
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05-14-2009 04:08
If there is supposed to be a delay on llSetAlpha, it's missing. Either runtime will run through 100 alpha levels in about half a second. From: Sindy I'm guessing this wiki is incorrect because llSetAlpha does a (full?) object update. An update for sure, but a partial one. |
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Meade Paravane
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Join date: 21 Nov 2006
Posts: 4,845
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05-14-2009 08:34
/me also thinks llSetAlpha does a full object update - I thought partials were just for position/rotation changes.. Easy enough to test except that I'm not in-world.
Even if it is only a partial update, doing it in a loop seems pretty expensive.
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Void Singer
Int vSelf = Sing(void);
Join date: 24 Sep 2005
Posts: 6,973
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05-14-2009 09:31
From: DrDoug Pennell
alpha_num = 1.0
while(alpha_num)
{
llSetAlpha(alpha_num, ALL_SIDES);
alpha_num=alpha_num - .01;
}
fixed (inifinite loop = bad) (100 shades of alpha? holy shitake mushrooms batman) I know it USED to be a full update, because it's one of the old suggested tricks for forcing other partial updates to register (like setRot under a certain limit) ETA: GDMFSABS forum parsing algorithm, I hate Hate HATE you
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Jesse Barnett
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05-14-2009 10:06
From: Void Singer ETA:
GDMFSABS forum parsing algorithm, I hate Hate HATE you You forgot the LL on the end: GDMFSABSLL
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Argent Stonecutter
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05-14-2009 10:12
From: Void Singer fixed (inifinite loop = bad) Maybe. You shouldn't compare a floating point number for exact equality, because all floating point calculations are approximate. It is possible that the value of alpha will never equal zero. Always compare floating point numbers with <, <=, >, >=. |
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Void Singer
Int vSelf = Sing(void);
Join date: 24 Sep 2005
Posts: 6,973
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05-14-2009 11:00
From: Argent Stonecutter Maybe.
You shouldn't compare a floating point number for exact equality, because all floating point calculations are approximate. It is possible that the value of alpha will never equal zero. Always compare floating point numbers with <, <=, >, >=. good point... although I do think hundredths properly map. but some values won't so yeah. actually the best case would be to start at 100 and count down, and use counter/100 to get the right value (and you can still cap at 0=false) although the extra overhead may not be worth it...
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Argent Stonecutter
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05-14-2009 12:36
From: Void Singer good point... although I do think hundredths properly map. 100 is not a power of two. |
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Viktoria Dovgal
…
Join date: 29 Jul 2007
Posts: 3,593
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05-14-2009 13:58
It is a partial update, that came from taking a few seconds to check.
A tight loop is silly for a much simpler reason, you aren't going to get that many evenly spaced steps in that time. In the half second it takes to loop through 100 alpha levels, you're being split up into roughly 23 time slices with all the other sim activity happening in between. Scripts aren't going to provide the resolution to do a lot better. It's a waste of effort. llSetTextureAnim with a stepped gradient might be able to deliver.
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Void Singer
Int vSelf = Sing(void);
Join date: 24 Sep 2005
Posts: 6,973
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05-14-2009 14:46
From: Viktoria Dovgal It is a partial update, that came from taking a few seconds to check.
A tight loop is silly for a much simpler reason, you aren't going to get that many evenly spaced steps in that time. In the half second it takes to loop through 100 alpha levels, you're being split up into roughly 23 time slices with all the other sim activity happening in between. Scripts aren't going to provide the resolution to do a lot better. It's a waste of effort. llSetTextureAnim with a stepped gradient might be able to deliver. could timer loop it, but 100 is probably overkill.
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Sindy Tsure
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Join date: 18 Sep 2006
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05-14-2009 18:20
Wow.. I didn't believe it until I saw it myself - it IS just a partial update. Nothing but blue with Show Updates on.
It would be nice to have a list of what changes cause full updates and which cause partials..
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Argent Stonecutter
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05-14-2009 18:24
From: Sindy Tsure Wow.. I didn't believe it until I saw it myself - it IS just a partial update. Nothing but blue with Show Updates on.
It would be nice to have a list of what changes cause full updates and which cause partials.. It probably changes from one server version to the next. |
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Sindy Tsure
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05-14-2009 18:52
From: Argent Stonecutter It probably changes from one server version to the next. /me bets it doesn't change very often at all.
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Argent Stonecutter
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05-14-2009 18:59
From: Sindy Tsure /me bets it doesn't change very often at all. If LL was doing it right, full updates would happen based on how long it had been since that specific prim had sent a full update, and not on what specific calls had been made. |
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Sindy Tsure
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05-14-2009 19:22
From: Argent Stonecutter If LL was doing it right... You keep saying that..
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Argent Stonecutter
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05-14-2009 19:30
From: Sindy Tsure You keep saying that.. It's not inconceivable. |
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Sindy Tsure
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05-14-2009 19:35
Lol
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Void Singer
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05-15-2009 09:01
I do not think that word means what you think it means...
actually it should be easy enough to test.. find something that does a full update, and spam it... if it sticks with a full update, there ya go.
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DrDoug Pennell
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05-22-2009 10:55
From: Void Singer fixed (inifinite loop = bad) (100 shades of alpha? holy shitake mushrooms batman)
Oops - just caught back up with this. Shoulda been while alpha_num =>0.1 (or whatever). I actually use this script all the time (the correct one, not the infinite loop version  ) It makes for a nice smooth transition from opaque to transparent (and back if you need it). Doug |