Hi,

in this case if the object has a certain radius (I hope it's roudn in shape ) you can do this

remove the lines

r0 = at time t0 obj.radius -- previous radius
r1 = at time t1 obj.radius -- current radius

and then change the line

angle = 360*len/((r0+r1)*pi) -- rotation amount (in degs)

to

angle = 360*len/(**X***pi) -- rotation amount (in degs)

where **X** is the diameter (2 times the raidus) of your object.