trampoline help

I am building a weird kind of experiment which some may have been wondering at which has a trampoline at its base that should throw someone based on the velicity they hit it at. There is a giant spiral there that should give me enough hight but how would I have it detect the fall speed then give the faller a negitive velocity upon impact with it.

I used this script so far but it requires a touch. And ends once the initial lauch happens:

default
{
touch_start(integer num)
{
llPushObject(llGetOwner(), <0, 0, 100>, <0, 0, 0>, 0);
}
}

I don't mind a touch but I rather have people standing on it before it launches them.

Thanks

maybe try the "collision_start( integer num_detected )" event in place of touch?

thanks.

that works.

I notice that it plays the fall down and get up animation before it registers that i am in contact with it. Can I use this to actually bounce? I wanted to have it determine the velocity at impact to then bounce me back up.

I wanted the trampoline to based on the physics instead of just tossing me up a predetermined height each time.

I was looking at this code from the beach ball. How would I apply this as my vector

vector impulse = llGetPos() - llDetectedPos(0); // Vector between avatar and ball
impulse.z += 7.0; // always add some 'up'
impulse = llVecNorm(impulse) * 7.0;
llApplyImpulse(impulse, FALSE);
llApplyRotationalImpulse(impulse * 0.25, FALSE);
llTriggerSound("bounce_2", 0.5);