BVH ==＞SMPL for Unified

BVH to SMPL

将BVH文件转换为SMPL模型，需要使用专业的3D建模软件。

例如
Blender或Maya。

Steps

1. 导入BVH文件到建模软件中。
2. 将BVH文件应用于一个适当的人体模型。
3. 将人体模型转换为SMPL模型。
4. 导出SMPL模型文件。

Realization

https://github.com/Meshcapade/SMPL_blender_addon

https://smpl-x.is.tue.mpg.de/

https://github.com/Rokoko/rokoko-studio-live-blender

• 下载 SMPL Model
• 安装 (edit–>preference)
• 应用（add ons）

SMPL ==> Frame 保存

Realize SMPL to Frame.npy through Scripting

Import

• NumPy
• Blender Python

import bpy
import numpy as np

SMPL list

SMPLX_JOINT_NAMES = [
    'pelvis','left_hip','right_hip','spine1','left_knee','right_knee','spine2','left_ankle','right_ankle','spine3', 
]

Frame list

frame_len = bpy.context.scene.frame_end

frames = []

Frame Synthesis

for fIdx in range(frame_len):
    print(fIdx)
    bpy.context.scene.frame_set(fIdx)

    ################################
    obj = bpy.data.objects.get('SMPLX-mesh-female')
    if obj is None:
        print("WARN: no obj {}".format(tar_name))
        break

    if obj.type == 'MESH':
        armature = obj.parent
    else:
        armature = obj

    # Get armature pose in rodrigues representation
    pose = [0.0] * (NUM_SMPLX_JOINTS * 3)

    for index in range(NUM_SMPLX_JOINTS):
        joint_name = SMPLX_JOINT_NAMES[index]
        joint_pose = rodrigues_from_pose(armature, joint_name)
        pose[index*3 + 0] = joint_pose[0]
        pose[index*3 + 1] = joint_pose[1]
        pose[index*3 + 2] = joint_pose[2]
    ################################

    frames.append(pose)

Save

seq_name = "ABCD."
np.save("PATH{}.npy".format(seq_name), frames)