vector filamentsample(<geometry>geometry, vector position)
Samples the velocity field defined by a set of vortex filaments at the
specified position
. The inputnum
or filename
parameter specifies the
geometry to fetch the filament curves from. The strength
and thickness
primitive attributes can be used on the geometry to customize the strength and
thickness of each filament. Returns the zero vector if inputnum
is out of
range or the filename
is invalid.
particles |