integer CHANNEL = -1;
//vector base_initial_pos;
rotation base_initial_rot;
vector object_initial_pos;
rotation object_initial_rot;
list parsecmd(string msg)
{
return llParseStringKeepNulls(msg,["|"],["|"]);
}
rotate_around_point(rotation rot, vector pos)
{
vector center = pos;
vector point = object_initial_pos;
// divide current rotation by the initial_rotation
// gives the actual rotation made
rotation diffrot = rot / base_initial_rot;
// get actual rotation in radians
vector eulero = llRot2Euler(diffrot);
float theta = eulero.z;
vector object_pos = llGetPos();
// according to https://academo.org/demos/rotation-about-point/
llOwnerSay("Rotating by "+(string)(RAD_TO_DEG*theta));
// 1) first we need to get transform such that center is the center of coordinate
float sin = llSin(theta);
float cos = llCos(theta);
// translate point back to origin:
float px = point.x - center.x;
float py = point.y - center.y;
// rotate point this is the core of rotation
float xnew = px * cos - py * sin;
float ynew = px * sin + py * cos;
// translate point back:
float px = xnew + center.x;
float py = ynew + center.y;
vector newpos = <px,py,point.z>;
//llOwnerSay("rotated by "+(string)(theta*RAD_TO_DEG)+" degrees ");
llSetLinkPrimitiveParamsFast( LINK_THIS, [
PRIM_POSITION, newpos,
PRIM_ROTATION, object_initial_rot*diffrot]);
}
default
{
state_entry()
{
llListen(CHANNEL,"","","");
}
listen(integer channel, string name, key id, string msg)
{
list result=parsecmd(msg);
llOwnerSay(llList2CSV(result));
string cmd = llList2String(result,0);
vector pos = llList2Vector(result,1);
rotation rot = llList2Rot(result,2);
if(cmd=="RESET")
{
llOwnerSay("Reset");
base_initial_rot = rot;
//base_initial_pos = pos;
object_initial_pos = llGetPos();
object_initial_rot = llGetRot();
}
if(cmd=="ROTATED")
{
//llOwnerSay("Rotated");
rotate_around_point(rot,pos);
}
}
}
Comments
0 B
|0 👍
/0 👎
0 B
|0 👍
/0 👎