Hi,
Is there a way to modify the initial Lattice Points without Affecting the Deformed Object?
By default, when you creating a Lattice Deformer, it will confirm to a default world-axis bounding box figure.
You can see the illustration of the problem here (15 sec video):
https://www.dropbox.com/s/p73ot7ph02w2s76/mya079_modify_initial_ffd_to_match_deformed_object.mp4?dl=0
Regards,
Ben
When creating a lattice, you can set a custom matrix. So you can input your own. You just have to make sure you set the matrix of both the lattice and its base.
import pymel.core as pm
selection = pm.selected()
for mesh in selection:
matrix = mesh.matrix.get()
lat = pm.lattice(divisions=[2,2,2])
for x in lat[1:]:
x.setMatrix(matrix.matrix)
x.scale.set(x.scale.get()*100) # the scale is just the conversion to meters, since my Maya is set to meters
I found this a really long time ago, which might also be of interest to you.
And if you want to make a “custom lattice”, have a look at Maya’s wrap deformer 
Hope that helps!
If you select both the lattice and the base together you can translate, rotate and/or scale them to fit as you like.