Need help using the Simple_Hair_UV script for creating hair uvs

mickeal_alex

Im using the Simple_Hair_UV script found in the Xgen UE documentation however when i imported my IGS alembic file that i exported, it has 3 different description and multiple splinegrp .
How do i add multiple groups and curves in the script?
Tried using " ; " and " , " in between each group and it doesn’t work.

https://docs.unrealengine.com/4.26/en-US/WorkingWithContent/Hair/XgenGuidelines/

Here is the part i am having trouble with, it's using Python.

curve_top_group= 'Herc_Flyaways|Herc_Hair_SplineGrp0 , Herc_HairBlend|Herc_Hair_SplineGrp0 , Herc_Hair|Herc_Hair_SplineGrp0'

It keeps giving me error, here is how the outliner looks like

  

Herer is the default script:

from maya import OpenMaya
import os

def create_root_uv_attribute(curves_group, mesh_node, uv_set='map1'):
    '''
    Create "groom_root_uv" attribute on group of curves.
    '''

    # check curves group
    if not cmds.objExists(curves_group):
        raise RuntimeError('Group not found: "{}"'.format(curves_group))

    # get curves in group
    curve_shapes = cmds.listRelatives(curves_group, shapes=True, noIntermediate=True)
    curve_shapes = cmds.ls(curve_shapes, type='nurbsCurve')
    if not curve_shapes:
        raise RuntimeError('Invalid curves group. No nurbs-curves found in group.')
    else:
        print "found curves"
        print curve_shapes

    # get curve roots
    points = list()
    for curve_shape in curve_shapes:
        point = cmds.pointPosition('{}.cv[0]'.format(curve_shape), world=True)
        points.append(point)

    # get uvs
    values = list()
    uvs = find_closest_uv_point(points, mesh_node, uv_set=uv_set)
    for u, v in uvs:
        values.append([u, v, 0])
        #print (str(u) + " , " + str(v)  )

    # create attribute
    name = 'groom_root_uv'
    cmds.addAttr(curves_group, ln=name, dt='vectorArray')
    cmds.addAttr(curves_group, ln='{}_AbcGeomScope'.format(name), dt='string')
    cmds.addAttr(curves_group, ln='{}_AbcType'.format(name), dt='string')

    cmds.setAttr('{}.{}'.format(curves_group, name), len(values), *values, type='vectorArray')
    cmds.setAttr('{}.{}_AbcGeomScope'.format(curves_group, name), 'uni', type='string')
    cmds.setAttr('{}.{}_AbcType'.format(curves_group, name), 'vector2', type='string')

    return uvs

def find_closest_uv_point(points, mesh_node, uv_set='map1'):
    '''
    Find mesh UV-coordinates at given points.
    '''

    # check mesh
    if not cmds.objExists(mesh_node):
        raise RuntimeError('Node not found: "{}"'.format(mesh_node))

    # check uv_set
    uv_sets = cmds.polyUVSet(mesh_node, q=True, allUVSets=True)
    if uv_set not in uv_sets:
        raise RuntimeError('Invalid uv_set provided: "{}"'.format(uv_set))

    # get mesh as dag-path
    selection_list = OpenMaya.MSelectionList()
    selection_list.add(mesh_node)

    mesh_dagpath = OpenMaya.MDagPath()
    selection_list.getDagPath(0, mesh_dagpath)
    mesh_dagpath.extendToShape()

    # get mesh function set
    fn_mesh = OpenMaya.MFnMesh(mesh_dagpath)

    uvs = list()
    for i in range(len(points)):

        script_util = OpenMaya.MScriptUtil()
        script_util.createFromDouble(0.0, 0.0)
        uv_point = script_util.asFloat2Ptr()

        point = OpenMaya.MPoint(*points[i])
        fn_mesh.getUVAtPoint(point, uv_point, OpenMaya.MSpace.kWorld, uv_set)

        u = OpenMaya.MScriptUtil.getFloat2ArrayItem(uv_point, 0, 0)
        v = OpenMaya.MScriptUtil.getFloat2ArrayItem(uv_point, 0, 1)

        uvs.append((u, v))

    return uvs

def abc_export(filepath, node=None, start_frame=1, end_frame=1, data_format='otawa', uv_write=True):

    job_command = '-frameRange {} {} '.format(start_frame, end_frame)
    job_command += '-dataFormat {} '.format(data_format)

    job_command += '-attr groom_root_uv '

    if uv_write:
        job_command += '-uvWrite '

    job_command += '-root {} '.format(node)   

    job_command += '-file {} '.format(filepath) 

    cmds.AbcExport(verbose=True, j=job_command)

def main():

    export_directory = 'D:/Dev/Ref'
    hair_file = os.path.join(export_directory, 'hair_export.abc')
    curve_top_group= 'description1|SplineGrp0'
    uv_mesh='pPlane1'

    create_root_uv_attribute( curve_top_group , uv_mesh)
    abc_export(hair_file, curve_top_group)

main()

mickeal_alex

Well as it turns out this script is limited and i found an alternate exporter that works better.

Juniaharambae

What alternate exporter did you end up using? I've tried all manner of different methods to get this script to work, but all attempts end in failure.

mickeal_alex

https://polycount.com/discussion/comment/2778099#Comment_2778099

Well the script from Epic games is the best however it's only up to Maya 2020, the simple hair uv script works as a script so it should work in every version of maya, these scripts are only if you want root hair uv's.