How to rotate a chid prim relative to another child?

[Poltergeist Azarov]

When it comes to rotate child prims relative to root, its ok but what about relative rotate to a child prim? 

[Poltergeist Azarov]

Solved, ty... 

[Poltergeist Azarov]

I thought I solved it but I was wrong. Can anyone help me please?

[Rolig Loon]

Depending on exactly what you are planning to do, that can be challenging computationally.  Essentially, what you need to do is daisy-chain the rotation of Child #1 relative to the root and then calculate Child #2 relative to Child #1, as in

llSetLocalRot (NewRot * LRot1 * llGetRot());

where NewRot is your proposed rotation .... Say llEuler2Rot(<0.0,0.0,10.0*DEG_TO_RAD>)

and you get LRot1 from

llGetLinkPrimitiveParams(2,[PRIM_ROT_LOCAL])

It gets complicated and slow when you are changing all rotations in a time step, so you need to adjust the root, then adjust LRot1 as necessary, and then NewRot.

 EDIT:  If your script is not in Child #2, then you want to use SLPPF to set PRIM_ROT_LOCAL instead of using llSetLocalRot

[Poltergeist Azarov]

Thanks, I am gonna take a look at that. How to calculate also relative pos? (by keeping the original distance between these two prims)

I actually made something but it doesnt keep the original distance between two prims. Just moves 3. prim 3 meters away and faces it on a flat line:

    touch_start(integer total_number)    {            rotation MiddleRot=llList2Rot(llGetLinkPrimitiveParams(2,[PRIM_ROTATION]),0);            vector   MiddlePos=llList2Vector(llGetLinkPrimitiveParams(2,[PRIM_POS_LOCAL]),0);            llSetLinkPrimitiveParamsFast(3,[PRIM_POS_LOCAL,MiddlePos+ llRot2Up(MiddleRot) * 3,                                            PRIM_ROT_LOCAL,MiddleRot]);    }

 Works by 3 linked prims and considers 2. prim as relative point for 3. prim.