Find vertex index from uv value

[Rémi Deletrain]

Hello everyone,

I have a question just being stupid.

Is it possible to retrieve the index of a vertex with u and v values.

Or find the index of a uv with u and v values to then find the index of the vertex.

The objectif is to make a symmetry with the points by uv.

[Rémi Deletrain]

I have a solution but it is very long in python. Easy to reproduce in cpp but I would like as much as possible try to make a quick trick in python ...

---------------------------------------------------------------------------------------------------------------------------------------

#    Get All UVs

u_values = OpenMaya.MFloatArray()

v_values = OpenMaya.MFloatArray()

mfn_mesh.getUVs(u_values, v_values, "SKIN")

#    Sort UVs left / right

r_list = {}

l_list = {}

for idx, (u, v) in enumerate(zip(u_values, v_values)):

    if u < 0.5:

        r_list[str(idx)] = [u, v]

    if u > 0.5:

        l_list[str(idx)] = [u, v]

#    Get UVs sym map

sym_map = {}

for rk, rv in r_list.items():

    sym_uv = pmc.dt.Vector(1 - rv[0], rv[1], 0)

    tmp_length = None

    for lk, lv in  l_list.items():

        l_uv = pmc.dt.Vector(lv[0], lv[1], 0)

        distance = sym_uv.distanceTo(sym_uv)

        if tmp_length is None or distance < tmp_length:

            tmp_length = distance

            sym_map[rk] = lk

            del l_list[lk]

#    R vertices

r_vertices = []

for idx in sym_map.keys():

    uv_name = mesh_node.name() + ".map[" + str(idx) + "]"

    v = pmc.polyListComponentConversion(uv_name, fromUV=True, toVertex=True)

    r_vertices.extend(v)

pmc.select(vertices)

#    L vertices

l_vertices = []

for idx in sym_map.values():

    uv_name = mesh_node.name() + ".map[" + str(idx) + "]"

    v = pmc.polyListComponentConversion(uv_name, fromUV=True, toVertex=True)

    l_vertices.extend(v)

pmc.select(r_vertices)

pmc.select(l_vertices)

---------------------------------------------------------------------------------------------------------------------------------------

[Rémi Deletrain]

Hello everyone,

I found a solution to optimize a little time calcul.

I split UVs to reduce the search field.

I share with you the python script.

https://github.com/RDelet/Maya_Tools/blob/master/Divers_Tools/sym_map.py

It's possible you have small problem when you launch script, I have split fwe function of my scripts

[Doktor Weeny]

You could have use cmds.polyListComponentConversion  (even if it is a quite slow command)

[Rémi Deletrain]

This command convert element index to another element index. Not found symetric index of an element.

And this command is very slow. I think it's possible to recreate this command for convert uv index to vertex index in api.
Today i try to convert this code to cpp and the result is very interesting.
Tomorrow i try to create command for convert uv index to vertex.