llSetLinkPrimitiveParams and flexibility

[Postmark Jensen]

I'm reworking a wing flapping script I found online.  The original script was overly complicated so I pared it down to the following.  Problem is it doesn't work.  The child prims *are* set to flexible and the gravity is indeed changed, but nothing happens.  Well, it appears that there is a small amount of tapering going on, but it's sporadic...

Any help would be appreciated!

 

// Gravity settings for the flaps
float UP = 1.0;
float DOWN = -1.0;
float MID = 0.0;
// Looping order of the flaps
list FLAPS;
// internal values
integer current_flap = 0;

 
default
{
    state_entry() {
        FLAPS = [ UP, DOWN, UP, DOWN, UP, DOWN, MID, MID, MID, MID ];
        llSetTimerEvent( 1.0 );
    }
 
    timer() {
        if ( current_flap >= 9 ) current_flap = 0;
        {
          
           llSetLinkPrimitiveParams( LINK_ALL_CHILDREN, 
                                     [PRIM_FLEXIBLE, TRUE,
                                     3, 
                                     llList2Integer(FLAPS, current_flap), 
                                     0.0, 
                                     0.0, 
                                     1.0 , 
                                     <0, 0, 0>]);
                }
 
        ++current_flap;
    } 
}

 

[Innula Zenovka]

I am not sure what the effect is supposed to be, but I think it should be llList2Float(FLAPS, current_flap),

[Postmark Jensen]

True that float, thank you, but the child prims still just stay there statically.  I believe that the intended result is to have the two child prims droop via gravity, then rise via gravity, mimicing wings.

[prim2](prim1)[prim3]

I might just have to make three sets of wings and cycle through their transparencies.

[Rolig Loon]

Well, for one thing, you are using llSetLinkPrimitiveParams, which has a 0.2 second delay and then you are switching its parameters once a second with your timer event.  I'd use llSetLinkPrimitiveParamsFast, which has no bulit-in delay at all. Even with SLPPF, though, you may not get a big effect unless you also apply a little impulse each time you switch from UP to DOWN.  I'd have to experiment a bit, but you may not be able to get a good response by just switching the gravity parameter in PRIM_FLEXIBLE that quickly.

[Postmark Jensen]

I tried a little, then a lot, of force with no luck.  I'm just going to use three sets of wings, which may be better since I'll be using llSetBouyancy on the root.

 

Thanks for your time, both of you

[Innula Zenovka]

This tutorial looks quite interesting: http://metaverse.mitsi.com/secondlife/posts/tandy/Part%206%20-%20Wings.htm

 

[Postmark Jensen]

Oddly enough, I stole the wing's texture from that, but glossed over anything about getting them to flap!  Thanks for pointing that out!

[Innula Zenovka]

The idea seems to be that you combine the two methods to get the best of both worlds; you have the flexible wings flexing gently while you're standing or walking, and then they become invisible and the sculpted wings start rapidly changing their visibility once you're in flight.