subtracting coordinate values from seperate lists python API

[s...@weacceptyou.com]

hello i have some python code that subtracts corresponding coordinates from two separate lists and then appends the result to a new list:

def findDiff(scan1_verts, scan2_verts):

diff_list=[]

for (v1,v2) in zip(scan2_verts,scan1_verts):
diff=(v1[0]-v2[0]),(v1[1]-v2[1]),(v1[2]-v2[2])
diff_list.append(diff)

return diff_list

what i want to know is if this can be done easily with the maya python API. I later want to use setPoints to set the verts of a new piece of mesh with this list. so for that reason i think they need to be OpenMaya.MFloatPoint values or something.

sorry im so confused by how the API does things. If someone could show me how to set it up i would really appreciate it.

thanks,
Sam

[Justin Israel]

Have you read up on the MFloatPoint in the docs? It shouldn't be too confusing to use. 

http://help.autodesk.com/view/MAYAUL/2016/ENU/?guid=__cpp_ref_class_m_float_point_html

Assuming your verts are normal tuples and you want to convert them to MFloatPoint,

import maya.OpenMaya as om

def findDiff(scan1_verts, scan2_verts):
    diff_list = om.MFloatPointArray()

    for v1, v2 in zip(scan2_verts, scan1_verts):
        p1 = om.MFloatPoint(*v1)
        p2 = om.MFloatPoint(*v2)
        diff_list.append(om.MFloatPoint(p2 - p1))

    return diff_list

​

Justin

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[s...@weacceptyou.com]

Thanks Justin,

I did read this page. But i still find it hard to make sense of how things are worded sometimes. Ill try and learn from this example

thanks,
Sam