Adds a force that will act at a given time in every particle's life. For example a force set to start at time 2 and end at time 3 will start influencing particles when they have been alive for 2 seconds. It will continue to act on those particles until they have been alive for 3 seconds. The force's influence is defined by an x, y, and z value that represent acceleration in units per second. For example a force with x=5 will adjust a particle's horizontal speed by adding 5 units for every second the force is active, if the force is only active for 0.5 seconds the particle would then be moving 2.5 units per second faster in the X direction. Multiple forces can be acting on a particle at the same time if their timings overlap.
Add3DParticlesForce( ID, starttime, endtime, x, y, z )
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