[Camino-users] Camino trajectories generation

[K V. Nguyen]

Dear all,
I am a new user of Camino. I would like to use Camino to generate the
trajectories (inside the closed cylinder PLY mesh).
1. From Camino tutorial: The simple command to generate trajectories is:
datasynth -walkers 100000 -tmax 1000 -p 0.0 -voxels 1 -initial uniform
-duration 0.2 -trajfile mytraj.traj
I am wondering about the particles stepping size in this case. The
particles stepping size should be sigma = sqrt(6*D0*dt), where D0 is
diffusivity coefficient and dt is time step. But in the above command,
there is no D0 value. So, how it works? Is there specify defaults value for
D0?

2. Now, I would like to generate trajectories inside *only one closed
cylinder* (defined by PLY mesh). The command is:
datasynth -walkers ${WALKERS} -tmax ${TVAL} -p 0.0 -voxels 1 -initial intra
-voxelsizefrac 1 -diffusivity 0.5E-9 -duration 0.05 -substrate ply -plyfile
${plyfile} -trajfile ${mytrajfile}

Where ${WALKERS}=131072 and ${TVAL}=1000. The header of my plyfile is
ply
comment closed surface
format ascii 1.0
element vertex *8071*
property float x
property float y
property float z
element face *16138*
property list uchar uint vertex_indices
end_header

The question are:
2.a. Is this command correct?
2.b. Why is the generation running very very slowly? (just 1% finished for
more than 12 hours running)

Thank you so much.
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