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howiemnet/gist:b63f759c99475dcb347c6ee727995778

Created January 3, 2017 11:31
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After Effects: expressions for Particular - particles from thrust
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gistfile1.txt
// apply this to the PoI of a spot light to point it in the direction of its acceleration vector
nextVec = transform.position.valueAtTime(time+0.08)-transform.position.valueAtTime(time);
prevVec = transform.position.valueAtTime(time)-transform.position.valueAtTime(time-0.08);
theVec = prevVec-nextVec;
theVec = theVec * 10;
theVec = theVec + transform.position;
theVec
// apply this to the Particles/sec parameter
prevVel = length(thisComp.layer("TEAL").transform.position.valueAtTime(time+0.04) - thisComp.layer("TEAL").transform.position.valueAtTime(time));
nextVel = length(thisComp.layer("TEAL").transform.position.valueAtTime(time+0.08) - thisComp.layer("TEAL").transform.position.valueAtTime(time+0.04));
Math.abs(nextVel-prevVel)*750
// and this to the particle velocity param
prevVel = length(thisComp.layer("TEAL").transform.position.valueAtTime(time+0.08) - thisComp.layer("TEAL").transform.position.valueAtTime(time));
nextVel = length(thisComp.layer("TEAL").transform.position.valueAtTime(time+0.08) - thisComp.layer("TEAL").transform.position.valueAtTime(time+0.08));
Math.abs(nextVel-prevVel)*50 // change to a negative value to emit against thrust
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