Difference between revisions of "WarpPos"
Kireji Haiku (talk | contribs) m (should be a tiny bit faster...changed from while to do...while) |
(The last change broke warpPos. Undo revision 1173893 by Kireji Haiku (Talk)) |
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WarpPos is a method by which the 10m limit on non-physical movement can be avoided, by exploiting a misfeature in [[llSetPrimitiveParams]] in which multiple parameters of the same flag type are executed in a single server frame. | WarpPos is a method by which the 10m limit on non-physical movement can be avoided, by exploiting a misfeature in [[llSetPrimitiveParams]] in which multiple parameters of the same flag type are executed in a single server frame. | ||
<lsl> | <lsl> | ||
// | warpPos( vector destinationRootPosition ) | ||
// | { | ||
// | //R&D by Keknehv Psaltery, 05/25/2006 | ||
// | //with a little poking by Strife, and a bit more | ||
// | //some more munging by Talarus Luan | ||
// | //Final cleanup by Keknehv Psaltery | ||
//Changed jump value to 411 (4096 ceiling) by Jesse Barnett | |||
// Compute the number of jumps necessary | |||
vector currentRootPosition = llGetRootPosition(); | vector currentRootPosition = llGetRootPosition(); | ||
integer jumps = (integer)(llVecDist(destinationRootPosition, currentRootPosition) / 10.0); | integer jumps = (integer)(llVecDist(destinationRootPosition, currentRootPosition) / 10.0) + 1; | ||
// Try and avoid stack/heap collisions | // Try and avoid stack/heap collisions | ||
if (jumps > | if (jumps > 411) | ||
jumps = | jumps = 411; | ||
// The start for the rules list | // The start for the rules list | ||
list rules = [PRIM_POSITION, destinationRootPosition]; | list rules = [ PRIM_POSITION, destinationRootPosition ]; | ||
integer count = 1; | integer count = 1; | ||
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currentRootPosition = llGetRootPosition(); | currentRootPosition = llGetRootPosition(); | ||
if ( llVecDist( currentRootPosition, destinationRootPosition ) > .001 ) | if ( llVecDist( currentRootPosition, destinationRootPosition ) > .001 ) | ||
while ( --jumps ) | |||
llSetLinkPrimitiveParamsFast(LINK_ROOT, [PRIM_POSITION, destinationRootPosition] ); | llSetLinkPrimitiveParamsFast(LINK_ROOT, [PRIM_POSITION, destinationRootPosition] ); | ||
} | } | ||
</lsl> | </lsl> | ||
Revision as of 01:30, 30 November 2012
WarpPos is a method by which the 10m limit on non-physical movement can be avoided, by exploiting a misfeature in llSetPrimitiveParams in which multiple parameters of the same flag type are executed in a single server frame. <lsl> warpPos( vector destinationRootPosition ) {
//R&D by Keknehv Psaltery, 05/25/2006 //with a little poking by Strife, and a bit more //some more munging by Talarus Luan //Final cleanup by Keknehv Psaltery //Changed jump value to 411 (4096 ceiling) by Jesse Barnett // Compute the number of jumps necessary
vector currentRootPosition = llGetRootPosition();
integer jumps = (integer)(llVecDist(destinationRootPosition, currentRootPosition) / 10.0) + 1;
// Try and avoid stack/heap collisions
if (jumps > 411)
jumps = 411;
// The start for the rules list list rules = [ PRIM_POSITION, destinationRootPosition ];
integer count = 1;
while ( ( count = count << 1 ) < jumps)
rules = (rules=[]) + rules + rules;// should tighten memory use.
llSetLinkPrimitiveParamsFast(LINK_ROOT,
rules + llList2List( rules, (count - jumps) << 1, count) );
//Failsafe
currentRootPosition = llGetRootPosition();
if ( llVecDist( currentRootPosition, destinationRootPosition ) > .001 )
while ( --jumps )
llSetLinkPrimitiveParamsFast(LINK_ROOT, [PRIM_POSITION, destinationRootPosition] );
} </lsl>
Quote: warpPos -- llSetPos without the limits ~~ Keknehv Psaltery
A few observations:
Sim crossings are perilous for AVs. Depending on connection speed and whether or not you are connected to the sim (can see it on the mini-map), it may screw up your client. However, it seems like objects, by themselves, can cross great distances. I managed to send an object 4 sims away diagonally. Further testing would help us to understand these things.
...
The average time this function takes to execute is under .2 seconds, which is barely noticeable at all, and can easily be attributed to general lag. A simple optimization for an object with a known destination might be to calculate the list beforehand, and then call llSetPrimitiveParams with that list.
...
a Linden ... response ... go ahead and find a workaround - I'd love to see it, I'm sure it is usefull, but it might not work very well across sim borders