As far as I know, the trajectory path is a parabel.

You have to know how Source engine handles applying gravity to an object to correctly calculate the path. The required force you need is, again, as far as I know, calculated with the potential energy and kinetic energy formulas.

Goes like this: in a gravitational field, the potential energy an object has at a certain height, is calculated with the formula E =

*mgh*, and the kinetic energy of an object is calculated with the formula E = (1/2)*mv^2. ( m = mass, g = gravitational pull( 9,81m/s^2 on Earth ), h = height )

---> mgh = (1/2)*mv^2 <=> gh = (1/2)*v^2 <=> v = sqrt( 2gh )

So the velocity you need to apply for the object to reach the highest point of the parabel( from that moment it will just fall to the desired position by itself ), is calculated with v = sqrt( 2gh ).

I think the tangent of the parabel at the launching point has something to do with this too, but can't think of anything right now. I haven't even tested this, but I think this would be a good start for you.

If anything in this is wrong please do correct me.