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[Jan Stránský <question681105@xxxxxxxxxxxxxxxxxxxxx>]

Question #681105 on Yade changed:
https://answers.launchpad.net/yade/+question/681105

Jan Stránský proposed the following answer:
> think is there a function in yade that calculates the displacement?

of course there is :-)

### script saving current position, reference position and displacement
# a simple case to save
from yade import export
s1,s2 = sphs = (
   sphere((1,2,3),4),
   sphere((5,6,7),8),
)
s1.state.vel = (2,3,4)
s2.state.vel = (5,6,7)
O.bodies.append(sphs)
O.step()
# actual save
export.textExt( # [1]
   "dspl.dat", # file name
   format="x_y_z_r_attrs", # if you would like to load it again
   comment="xr yr zr dx dy dz", # 1st line of the file (x y z radius is there by default)
   attrs=["b.state.refPos","b.state.displ()"] # saving reference position and displacement vector
)
###

cheers
Jan

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