Interpolation/Examples

From Second Life Wiki

Moves linearly upwards, then slides down speeding up and slowing down as well, then it takes a curvy path using a cubic curve to the beginning. Each step activated with a touch to show it in practice.

 
vector vLin(vector v0, vector v1,float t){
    return v0*(1-t) + v1*t;}
 
vector vCos(vector v0,vector v1,float t){
    float F = (1 - llCos(t*PI))/2;
    return v0*(1-F)+v1*F;}
 
vector vCub(vector v0,vector v1,vector v2,vector v3,float t){
    vector P = (v3-v2)-(v0-v1);vector Q = (v0-v1)-P;vector R = v2-v0;vector S = v1;
    return P*llPow(t,3) + Q*llPow(t,2) + R*t + S;}
 
default{
    touch_start( integer d ){
        vector A = llGetPos();
        vector B = A + < 0, 0, 2>;
 
        float x;
        while( x <= 1.0 ){
            llSetPos( vLin( A, B, x += 0.05 ) );
        }
        state Two;
    }
}
 
state Two{
    touch_start( integer d ){
        vector A = llGetPos();
        vector B = A + < 2, 0,-2>;
 
        float x;
        while( x <= 1.0 ){
            llSetPos( vCos( A, B, x += 0.05 ) );
        }
        state Three;
    }
}
 
state Three{
    touch_start( integer d ){
        vector A = llGetPos();
        vector B = A + <-2, 0, 0>;
        vector C = A + < 0, 4, 0>;
        vector D = A + <-2,-4, 0>;
 
        float x;
        while( x <= 1.0 ){
            llSetPos( vCub( C, A, B, D, x += 0.05 ) );
        }
        state default;
    }
}