gltfからUsdMeshを作る

import trimesh
from pxr import Usd, UsdGeom, Sdf

gltf_file = r"D:\work\data_sample\susanne.glb"
gltf = trimesh.load(gltf_file)
geo_name = list(gltf.geometry.keys())[0]
geo = gltf.geometry[geo_name]

# 頂点取得
vtx = []
for v in geo.vertices:
    vtx.append(list(v))

# Faceを構成するIndexとVertexCountを取得
indexes = []
vtxcount = []

for f in geo.faces:
    indexes += [int(x) for x in f]
    vtxcount.append(len(f))

# to USDMesh
stage = Usd.Stage.CreateInMemory()
UsdGeom.Xform.Define(stage, f'/{geo_name}')
mesh = UsdGeom.Mesh.Define(stage, f'/{geo_name}/{geo_name}Mesh')

mesh.CreatePointsAttr(vtx)
# 1FaceあたりのVertex数
mesh.CreateFaceVertexCountsAttr(vtxcount)
# 結線情報？
mesh.CreateFaceVertexIndicesAttr(indexes)
# BoundingBoxをセット？
mesh.CreateExtentAttr(UsdGeom.PointBased(mesh).ComputeExtent(mesh.GetPointsAttr().Get()))