Attractor4DPull Actionscript
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Compute the pull from an attractor on this particle.
author Olaf Havnes
version Revision: 1.2 Date: 2003/03/17 22:53:05
since SWFIT1.0
dx = _parent.ax - px;
dy = _parent.ay - py;
dz = _parent.az - pz;
dq = _parent.aq - pq;
Eliminate the 4th dimension
dq = 0;
a_len_sq = dx * dx + dy * dy + dz * dz + dq * dq;
a_len = (a_len + a_len_sq / a_len) / 2;
a_f = _parent.pull / (a_len * a_len_sq);
a_f = _parent.pull / a_len_sq;
The force is F = Constant / a_len_sq along the vector (dx, dy, dz, dq) / a_len
vx += a_f * dx;
vy += a_f * dy;
vz += a_f * dz;
vq += a_f * dq;
px += vx;
py += vy;
pz += vz;
pq += vq;
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