Simple floating script available?

I made a simple raft for the water on my beach.. if there a simple script I can drop into it, so it floats up and down a little, looking like it is floating on the water?

I tried a few things here, but nothing worked.

You might be able to just use something reallly basic like, depending how fancy you want it. This is just a rough outline, you could tweak it significantly for a more organic feel.. perhaps incorporate some random values and variance between waves etc. But just as a general idea:

// wave height
float BOB_DISTANCE = 0.1;

// estimate of time it takes to bob from top of wave to bottom of wave
// larger numbers will slow movement, smaller numbers will speed it
float BOB_TIME = 2;

// frequency that waves occur
float TIME_BETWEEN_BOBS = 5;

// current state information
integer UP = 1;
integer DOWN = 2;
integer CURRENT_POSITION = UP;

bob(integer direction)
{
if(direction == UP)
llMoveToTarget(llGetPos()+<0,0,BOB_DISTANCE>, BOB_TIME);
else
llMoveToTarget(llGetPos()+<0,0,-BOB_DISTANCE>, BOB_TIME);
}
default
{
state_entry()
{
//initial move to put raft at top of a wave
llMoveToTarget(llGetPos()+<0,0,BOB_DISTANCE/2>, 0.1);
llSetTimerEvent(TIME_BETWEEN_BOBS);
}
timer()
{
if(CURRENT_POSITION == UP)
bob(DOWN);
else
bob(UP);
}
}

I'll try this, and see how it looks. My scripting skills are more hacking existing ones that are out there, so they are pretty poor.

Basically, it would just need to raise and lower, and maybe tiilt back on the raise, and foreward a little on the decline.

I'll see how this looks...and thanks!

Hmm added that, and nothing happens at all.

llMoveToTarget works only on physical objects, if your object was not already physical and buoyant it would definitely not work.

add these lines to the state entry:

llSetBuoyancy(1.0);
llSetStatus(STATUS_PHYSICS,TRUE);

give that a go.

Tried this: but I get a syntax error.. did I add it improperly?

(I'm just dropping it into a prim for testing)

// wave height
float BOB_DISTANCE = 0.1;

// estimate of time it takes to bob from top of wave to bottom of wave
// larger numbers will slow movement, smaller numbers will speed it
float BOB_TIME = 2;

// frequency that waves occur
float TIME_BETWEEN_BOBS = 5;

// current state information
integer UP = 1;
integer DOWN = 2;
integer CURRENT_POSITION = UP;

bob(integer direction)
{
if(direction == UP)
llMoveToTarget(llGetPos()+<0,0,BOB_DISTANCE>, BOB_TIME);
else
llMoveToTarget(llGetPos()+<0,0,-BOB_DISTANCE>, BOB_TIME);
}
default
{
state_entry()
llSetBuoyancy(1.0);
llSetStatus(STATUS_PHYSICS,TRUE);
{
//initial move to put raft at top of a wave
llMoveToTarget(llGetPos()+<0,0,BOB_DISTANCE/2>, 0.1);
llSetTimerEvent(TIME_BETWEEN_BOBS);
}
timer()
{
if(CURRENT_POSITION == UP)
bob(DOWN);
else
bob(UP);
}
}

I just typed this up w/o trying inworld so there's likely just some braindead typos in there, what line is giving an error? If you click on the error in the script editor it should take you to the line.

I do see an error in the state_entry.

THIS
state_entry()
llSetBuoyancy(1.0);
llSetStatus(STATUS_PHYSICS,TRUE);
{
//initial move to put raft at top of a wave
llMoveToTarget(llGetPos()+<0,0,BOB_DISTANCE/2>, 0.1);
llSetTimerEvent(TIME_BETWEEN_BOBS);
}


SHOULD BE
state_entry()
{
//initial move to put raft at top of a wave
llSetBuoyancy(1.0);
llSetStatus(STATUS_PHYSICS,TRUE);
llMoveToTarget(llGetPos()+<0,0,BOB_DISTANCE/2>, 0.1);
llSetTimerEvent(TIME_BETWEEN_BOBS);
}

The {}'s encapsulate the code for a function or state.

I was curious to try out this script in world. But the raft doesnt bob, it slowly sinks lower and lower, never bobbing back up.

// wave height
float BOB_DISTANCE = 0.1;

// estimate of time it takes to bob from top of wave to bottom of wave
// larger numbers will slow movement, smaller numbers will speed it
float BOB_TIME = 1;

// frequency that waves occur
float TIME_BETWEEN_BOBS = 1;

// current state information
integer UP = 1;
integer DOWN = 2;
integer CURRENT_POSITION = UP;

bob(integer direction)
{
if(direction == UP)
llMoveToTarget(llGetPos()+<0,0,BOB_DISTANCE>, BOB_TIME);
else
llMoveToTarget(llGetPos()+<0,0,-BOB_DISTANCE>, BOB_TIME);
}
default
{
state_entry()
{
//initial move to put raft at top of a wave
llSetBuoyancy(1.0);
llSetStatus(STATUS_PHYSICS,TRUE);
llMoveToTarget(llGetPos()+<0,0,BOB_DISTANCE/2>, 0.1);
llSetTimerEvent(TIME_BETWEEN_BOBS);
}

timer()
{
if(CURRENT_POSITION == UP) 
bob(DOWN);
else 
bob(UP);
}
}

Try replacing the timer function with this.

timer()
{
if(CURRENT_POSITION == UP)
{
CURRENT_POSITION = DOWN;
bob(DOWN);
}
else
{
CURRENT_POSITION = UP;
bob(UP);
}
}

Thanks Sharp, That works much better, I'm going to leave it running awhile and see how it does.

glad this is being revisited. Is it possible to add a tilt back going down, and a tilt foreward going up, to more simulate wave movement?

Search for the balloon thread. Same problem exactly, with a simple solution.

I tried replacing the timer function, but get a syntax error.. here's what I have:

// wave height
float BOB_DISTANCE = 0.1;

// estimate of time it takes to bob from top of wave to bottom of wave
// larger numbers will slow movement, smaller numbers will speed it
float BOB_TIME = 1;

// frequency that waves occur
float TIME_BETWEEN_BOBS = 1;

// current state information
integer UP = 1;
integer DOWN = 2;
integer CURRENT_POSITION = UP;

bob(integer direction)
{
if(direction == UP)
llMoveToTarget(llGetPos()+<0,0,BOB_DISTANCE>, BOB_TIME);
else
llMoveToTarget(llGetPos()+<0,0,-BOB_DISTANCE>, BOB_TIME);
}
default
{
state_entry()
{
//initial move to put raft at top of a wave
llSetBuoyancy(1.0);
llSetStatus(STATUS_PHYSICS,TRUE);
llMoveToTarget(llGetPos()+<0,0,BOB_DISTANCE/2>, 0.1);
llSetTimerEvent(TIME_BETWEEN_BOBS);
}

timer()
{
if(CURRENT_POSITION == UP)
{
CURRENT_POSITION = DOWN;
bob(DOWN);
}
else
{
CURRENT_POSITION = UP;
bob(UP);
}
}

the error comes up at the last bracket in the script

I added an additional bracket at the bottom and it compiles, but still only goes down, not back up

I also just tried the baloon script, but it syntax errors when compiling.. if you ignore that, it drops like a rock, with a slight bounce

The bobbing works ok with this script now, but after I left it running for 3 or 4 hours it ended up floating 9.8 meters in the air. It gradually gains altitude as it bobs up and down.

// wave height
float BOB_DISTANCE = 0.1;

// estimate of time it takes to bob from top of wave to bottom of wave
// larger numbers will slow movement, smaller numbers will speed it
float BOB_TIME = 1;

// frequency that waves occur
float TIME_BETWEEN_BOBS = 1;

// current state information
integer UP = 1;
integer DOWN = 2;
integer CURRENT_POSITION = UP;

bob(integer direction)
{
if(direction == UP)
llMoveToTarget(llGetPos()+<0,0,BOB_DISTANCE>, BOB_TIME);
else
llMoveToTarget(llGetPos()+<0,0,-BOB_DISTANCE>, BOB_TIME);
}
default
{
state_entry()
{
//initial move to put raft at top of a wave
llSetBuoyancy(1.0);
llSetStatus(STATUS_PHYSICS,TRUE);
llMoveToTarget(llGetPos()+<0,0,BOB_DISTANCE/2>, 0.1);
llSetTimerEvent(TIME_BETWEEN_BOBS);
}


timer()
{
if(CURRENT_POSITION == UP)
{
CURRENT_POSITION = DOWN;
bob(DOWN);
}
else
{
CURRENT_POSITION = UP;
bob(UP);
}
}
}

that does work here, but the prim also rotates around randomly too much. My original idea was to put it in a prim floating chair, for our beachfront property, but if you sit on the prim as it is, you end up upside down in no time.

It would work though for a flaoting beach ball, maybe transmapped clouds, or something y
you want reletivly statiionary, but with some floating or random movement.

Might be interesting with some flexi parts attached as well.

One error with this, it seems the "down" or "up" is sometimes duplicated 2 or 3 times, before switching to the opposite, so over time, the prim "sinks' or rises.

I would think the safer thing to do (to avoid slowly creeping in one direction or the other) would be to set a global vector on rez that holds the position, and then use the llMoveToTarget to always use that global +/- the bob offset. There should never be any drift that way.

Since this script is always referencing the "current" position of the object, rather than the rezzed position, there will always be drift.

No one (to my knowledge) ever came up with a simple bobbing script at all.

I have made a ball of hollowed out plastic and used physics and llSetBuoyancy(1.0);

But the ball seems to float away slowly up until it reaches the end of the sim. Does anybody know what the proer value is. 0.95 makes it sink (and none too slowly) in the water.

This is pretty confusing.

Thanks for any advice.

Lordly

Have you given llSetHoverHeight() a try?

http://www.lslwiki.net/lslwiki/wakka.php?wakka=llSetHoverHeight