slowing a rotation to a stop

[Pedlar Decosta]

Hi, I'm looking for some tips on the best way to slow a rotation down until it stops, rather than just rotating or stopping. It is for someone who wants to make a ride. I'm using llEulerRot() to turn it for a certain amount of time, but don't want the stop to be so jarring.

Any help is appreciated.

[Quistess Alpha]

llEuler2Rot isn't really for turning things, did you mean llTargetOmega?

You can actually use llSetLinkPrimitiveParamsFast(link,[PRIM_ROT_LOCAL... on a timer or in a loop to do the rotation but it might be a bit "stuttery" for lack of a better term.

Another possibility is to look into llSetKeyframeMotion() for the rotation. You could loop a 90 degree rotation and when you want it to stop add keyframes with smaller and smaller angles for the same timestep.

integer gON;
 
default
{
    touch_start(integer total_number)
    {
        gON = !gON;
        if (gON)
        {
            // Make repeated rotations of PI/2 radians, each taking 0.5 seconds
            llSetKeyframedMotion(
            [  llAxisAngle2Rot(<0,0,1>,PI_BY_TWO), 0.5],
            [  KFM_DATA,KFM_ROTATION, KFM_MODE,KFM_LOOP]);
        }
        else
        {
            llSetKeyframedMotion(
            [  llAxisAngle2Rot(<0,0,1>,PI_BY_TWO), 0.5,
               llAxisAngle2Rot(<0,0,1>,PI_BY_TWO*0.8), 0.5,
               llAxisAngle2Rot(<0,0,1>,PI_BY_TWO*0.6), 0.5,
               llAxisAngle2Rot(<0,0,1>,PI_BY_TWO*0.4), 0.5,
               llAxisAngle2Rot(<0,0,1>,PI_BY_TWO*0.2), 0.5
            ],
            [  KFM_DATA,KFM_ROTATION, KFM_MODE,KFM_FORWARD]);
        }
    }
}

(wasn't going to do an example, but the example script from the wiki was easy to modify)

http://wiki.secondlife.com/wiki/LlSetKeyframedMotion

Edited June 17, 2021 by Quistessa
added example

[Pedlar Decosta]

4 hours ago, Quistessa said:

llEuler2Rot isn't really for turning things, did you mean llTargetOmega?

Yeah, sorry. I'm trying to stay productive with a dose of the flu. Can't think straight. llSetKeyFramedMotion() is what I should have said. I just wasn't sure how to degrade it and hopefully make it smooth. I figured it would be kind of jerky. So thanks so much for the example. It helps a lot.