User talk:Fred Gandt/Scripts/Continued 4

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It seems like that having the text conversion in the function limits how reusable the function is.

I've spotted a couple of bugs and race conditions. Nothing serious but potentially bothersome non the less.

  • It should be faster to gen the list outside the loop as it changes the operation into a simple copy.
  • It's possible that the dest position is unachievable and your script will hang (hence the distance check).
  • -1 is the value for LINK_SET, which will cause llSetLinkPrimitiveParamsFast to try to move the seated avatar to that local position as well as the root prim to the same global position.
  • The script could end up in a non-root prim, which would cause it to still end up in an infinite loop as llGetPos returns local+root position. Hence llGetRootPosition.

<lsl>Zippadeedoodah(string dest_s) {

   vector dest = ((vector)("<" + dest_s + ">"));
   list pos = [PRIM_POSITION, dest];
   while(llVecDist(llGetRootPosition(), dest) > 0.001)
       llSetLinkPrimitiveParamsFast(LINK_ROOT, pos);

}</lsl> Random rambling addressing nobody: Using PRIM_POSITION with LINK_SET only makes sense as a bit of cleverness and with limited real world application. Wonder if I should write a note about about this? It might be useful in a (HUD) attachment? In any case you would probably want to use LINK_ALL_CHILDREN instead. Mixing global and local coord frames is unlikely to be wise. hmmm -- Strife (talk|contribs) 06:18, 16 May 2010 (UTC)

A bee or wasp just stung the top of my head while I was walking my dog. *whimpers* -- Fred Gandt (talk|contribs) 07:32, 16 May 2010 (UTC)
I'll be honest (I always am), I can't see how the tiny measure of llVecDist(llGetRootPosition(), dest) > 0.001 could ever be an issue (but seriously my head feels bloated and poopy). I fully understand the LINK_THING verses LINK_THING thing (Thank you. Now under belt). I assume that storing list pos = [PRIM_POSITION, dest]; before using it makes the use of it faster or more efficient? We don't have to create the list fresh each call of llSetTheThingies? Tried it in-world and it seemed about the same performance wise (too poopy to get into it...oooh I know....erm....llGetTime). -- Fred Gandt (talk|contribs) 08:02, 16 May 2010 (UTC)
2.623372 (V1) against 2.400593 (V2) seconds. Obviously the same rout traveled. That was ground to 4000m almost directly up. So yours is slightly quicker (in one test) *smiles* Thanks for the heads up Strife. It's nice to know someone is watching my back. I do mention on my main user page that I try but can fail. "It takes a village" and all that. TY -- Fred Gandt (talk|contribs) 08:18, 16 May 2010 (UTC)
What's a race condition? -- Fred Gandt (talk|contribs) 08:56, 16 May 2010 (UTC)
OK. Wikipedia has answered that one but...oh never mind. Damn buzzy flying thing. My head feels like mush. -- Fred Gandt (talk|contribs) 09:03, 16 May 2010 (UTC)

llVecDist because of float rounding? True equality with dest being occasionally but then repeatedly missed? lolz llSetPosKindaSorta. I really do get the LINK_ROOT stuff btw (not just saying that to seem smarter). I hadn't realized before your comment that -1 would attempt to move each prim to dest, rather I thought (stupidly I now realize) that I was asking that the set be moved *grins*

Sorry about my own ramblings. That sting made my head pound a bit. Just watched "Scanners" all the way through for the first time. Interestingly (for me at least) watching other peoples head swell and explode made my own swelling go down. -- Fred Gandt (talk|contribs) 13:27, 16 May 2010 (UTC)
It's all cool. The position thing is annoying, there should be a caveat about that somewhere. -- Strife (talk|contribs) 20:24, 16 May 2010 (UTC)