fbx格式转换

本文主要是介绍fbx格式转换，希望对大家解决编程问题提供一定的参考价值，需要的开发者们随着小编来一起学习吧！

fbx转bvh

bvh转fbx

npz转换为fbx

npz转换为fbx代码：

convert2fbx.py

fbx转bvh

https://github.com/SinMDM/SinMDM/blob/0296efba20ae5875b6f1c092d277ea274e8ceda2/utils/fbx2bvh.py

"""
This code is a variation of https://github.com/rubenvillegas/cvpr2018nkn/blob/master/datasets/fbx2bvh.py
"""
from glob import glob
import os
import os.path as ospimport bpyprint('start')
in_dir = '<path to folder containing fbx file>'
out_dir = in_dir + '/fbx2bvh'  # in_dir.replace('fbx', 'bvh')
fbx_files = glob(osp.join(in_dir, '*.fbx'))
for idx, in_file in enumerate(fbx_files):print(in_file)in_file_no_path = osp.split(in_file)[1]motion_name = osp.splitext(in_file_no_path)[0]rel_in_file = osp.relpath(in_file, in_dir)rel_out_file = osp.join(osp.split(rel_in_file)[0], '{}'.format(motion_name), '{}.bvh'.format(motion_name))rel_dir = osp.split(rel_out_file)[0]out_file = osp.join(out_dir, rel_out_file)os.makedirs(osp.join(out_dir, rel_dir), exist_ok=True)bpy.ops.import_scene.fbx(filepath=in_file)action = bpy.data.actions[-1]assert action.frame_range[0] < 9999 and action.frame_range[1] > -9999  # checking because of Kfir's codebpy.ops.export_anim.bvh(filepath=out_file,frame_start=action.frame_range[0],frame_end=action.frame_range[1], root_transform_only=True)bpy.data.actions.remove(bpy.data.actions[-1])print('{} processed. #{} of {}'.format(out_file, idx, len(fbx_files)))

bvh转fbx

npy库：

import os.pathimport bpy
import sysbvh_in = r'D:\project\MHFormer-pose\baitao.bvh'
bvh_in = r'D:\project\MHFormer-pose\9_0122_mh.bvh'
fbx_out = "aa.fbx"filename=os.path.basename(bvh_in)file_name_with_extension = os.path.basename(bvh_in)# 使用 splitext 分割文件名和后缀
filename, file_extension = os.path.splitext(file_name_with_extension)fbx_out = filename+".fbx"
# Import the BVH file
# See https://docs.blender.org/api/current/bpy.ops.import_anim.html?highlight=import_anim#module-bpy.ops.import_animbpy.ops.wm.read_factory_settings(use_empty=True)bpy.ops.import_anim.bvh(filepath=bvh_in, filter_glob="*.bvh", global_scale=0.0001, frame_start=1, target='ARMATURE',use_fps_scale=False, use_cyclic=False, rotate_mode='NATIVE', axis_forward='Z', axis_up='Y')
#
# # Export as FBX
# # See https://docs.blender.org/api/current/bpy.ops.export_scene.html
# bpy.ops.export_scene.fbx(filepath=fbx_out, axis_forward='Z',
#                          axis_up='Y', use_selection=True, apply_scale_options='FBX_SCALE_NONE')# bpy.ops.import_anim.bvh(filepath=bvh_in, update_scene_fps=True, update_scene_duration=True)# Ensure correct scene frame range
assert len(bpy.data.actions) == 1
frame_range = bpy.data.actions[0].frame_range
bpy.context.scene.frame_start = int(frame_range[0])
bpy.context.scene.frame_end = int(frame_range[1])# Add some mesh data so UE allows import
bpy.data.objects[filename].name = "animation"
bpy.ops.mesh.primitive_plane_add()
bpy.data.objects["Plane"].name = filename
bpy.data.objects["animation"].select_set(True)
bpy.ops.object.parent_set()  # Parent the "animation" object to cube# Export
bpy.ops.export_scene.fbx(filepath=fbx_out, check_existing=False)

npz转换为fbx

https://github.com/Arthur151/ROMP/blob/4eebd3647f57d291d26423e51f0d514ff7197cb3/simple_romp/tools/convert2fbx.py

依赖项

mathutils

pip install mathutils

npz转换为fbx代码：

需要两个模板：

male_model_path = './models/SMPL_m_unityDoubleBlends_lbs_10_scale5_207_v1.0.0.fbx'
female_model_path = './models/SMPL_f_unityDoubleBlends_lbs_10_scale5_207_v1.0.0.fbx'

要求npz中有字典results和sequence_results

frame_results = np.load(input_path, allow_pickle=True)['results'][()] sequence_results = np.load(input_path, allow_pickle=True)['sequence_results'][()]

convert2fbx.py

import os
import sys
import time
import argparse
import numpy as np
from math import radianstry:import bpy
except:print('Missing bpy, install via pip, please install bpy by yourself if failed.')os.system('pip install future-fstrings')os.system('pip install tools/bpy-2.82.1 && post_install')import bpy
try:from mathutils import Matrix, Vector, Quaternion, Euler
except:os.system('pip install mathutils==2.81.2')from mathutils import Matrix, Vector, Quaternion, Euler# Globals
# Add your UNIX paths here!
male_model_path = './models/SMPL_m_unityDoubleBlends_lbs_10_scale5_207_v1.0.0.fbx'
female_model_path = './models/SMPL_f_unityDoubleBlends_lbs_10_scale5_207_v1.0.0.fbx'
character_model_path = None'''
python tools/convert2fbx.py --input=/home/yusun/BEV_results/video_results.npz --output=/home/yusun/BEV_results/dance.fbx --gender=female
'''fps_source = 24
fps_target = 24gender = 'male'  # femalesupport_formats = ['.fbx', '.glb', '.bvh']bone_name_from_index = {0: 'Pelvis', 1: 'L_Hip', 2: 'R_Hip', 3: 'Spine1', 4: 'L_Knee', 5: 'R_Knee', 6: 'Spine2', 7: 'L_Ankle', 8: 'R_Ankle', 9: 'Spine3', 10: 'L_Foot', 11: 'R_Foot', 12: 'Neck', 13: 'L_Collar', 14: 'R_Collar', 15: 'Head', 16: 'L_Shoulder', 17: 'R_Shoulder', 18: 'L_Elbow',19: 'R_Elbow', 20: 'L_Wrist', 21: 'R_Wrist', 22: 'L_Hand', 23: 'R_Hand'}# To use other avatar for animation, please define the corresponding 3D skeleton like this.
bone_name_from_index_character = {0: 'Hips', 1: 'RightUpLeg', 2: 'LeftUpLeg', 3: 'Spine', 4: 'RightLeg', 5: 'LeftLeg', 6: 'Spine1', 7: 'RightFoot', 8: 'LeftFoot', 9: 'Spine2', 10: 'LeftToeBase', 11: 'RightToeBase', 12: 'Neck', 13: 'LeftHandIndex1', 14: 'RightHandIndex1', 15: 'Head',16: 'LeftShoulder', 17: 'RightShoulder', 18: 'LeftArm', 19: 'RightArm', 20: 'LeftForeArm', 21: 'RightForeArm', 22: 'LeftHand', 23: 'RightHand'}# Helper functions# Computes rotation matrix through Rodrigues formula as in cv2.Rodrigues
# Source: smpl/plugins/blender/corrective_bpy_sh.py
def Rodrigues(rotvec):theta = np.linalg.norm(rotvec)r = (rotvec / theta).reshape(3, 1) if theta > 0. else rotveccost = np.cos(theta)mat = np.asarray([[0, -r[2], r[1]], [r[2], 0, -r[0]], [-r[1], r[0], 0]])return (cost * np.eye(3) + (1 - cost) * r.dot(r.T) + np.sin(theta) * mat)# Setup scene
def setup_scene(model_path, fps_target):scene = bpy.data.scenes['Scene']############################ Engine independent setup###########################scene.render.fps = fps_target# Remove default cubeif 'Cube' in bpy.data.objects:bpy.data.objects['Cube'].select_set(True)bpy.ops.object.delete()# Import gender specific .fbx template filebpy.ops.import_scene.fbx(filepath=model_path)# Process single pose into keyframed bone orientations
def process_pose(current_frame, pose, trans, pelvis_position):if pose.shape[0] == 72:rod_rots = pose.reshape(24, 3)else:rod_rots = pose.reshape(26, 3)mat_rots = [Rodrigues(rod_rot) for rod_rot in rod_rots]# Set the location of the Pelvis bone to the translation parameterarmature = bpy.data.objects['Armature']bones = armature.pose.bones# Pelvis: X-Right, Y-Up, Z-Forward (Blender -Y)root_location = Vector((100 * trans[1], 100 * trans[2], 100 * trans[0])) - pelvis_position# Set absolute pelvis location relative to Pelvis bone headbones[bone_name_from_index[0]].location = root_location# bones['Root'].location = Vector(trans)bones[bone_name_from_index[0]].keyframe_insert('location', frame=current_frame)for index, mat_rot in enumerate(mat_rots, 0):if index >= 24:continuebone = bones[bone_name_from_index[index]]bone_rotation = Matrix(mat_rot).to_quaternion()quat_x_90_cw = Quaternion((1.0, 0.0, 0.0), radians(-90))# quat_x_n135_cw = Quaternion((1.0, 0.0, 0.0), radians(-135))# quat_x_p45_cw = Quaternion((1.0, 0.0, 0.0), radians(45))# quat_y_90_cw = Quaternion((0.0, 1.0, 0.0), radians(-90))quat_z_90_cw = Quaternion((0.0, 0.0, 1.0), radians(-90))if index == 0:# Rotate pelvis so that avatar stands upright and looks along negative Y avisbone.rotation_quaternion = (quat_x_90_cw @ quat_z_90_cw) @ bone_rotationelse:bone.rotation_quaternion = bone_rotationbone.keyframe_insert('rotation_quaternion', frame=current_frame)return# Process all the poses from the pose file
def process_poses(input_path, gender, fps_source, fps_target, subject_id=-1):print('Processing: ' + input_path)frame_results = np.load(input_path, allow_pickle=True)['results'][()]sequence_results = np.load(input_path, allow_pickle=True)['sequence_results'][()]poses, trans = [], []if len(sequence_results) > 0:subject_ids = list(sequence_results.keys())if subject_id == -1 or subject_id not in subject_ids:print('Get motion sequence with subject IDs:', subject_ids)subject_id = int(input('Please select one subject ID (int):'))poses = np.array(sequence_results[subject_id]['smpl_thetas'])trans = np.array(sequence_results[subject_id]['cam_trans'])else:print('Missing tracking IDs in results. Using the first pose results for animation.')print('To get the tracking IDs, please use temporal optimization during inference.')frame_names = sorted(list(frame_results.keys()))poses, trans = np.zeros((len(frame_names), 72)), np.zeros((len(frame_names), 3))for inds, frame_name in enumerate(frame_names):poses[inds] = frame_results[frame_name]['smpl_thetas'][0]trans[inds] = frame_results[frame_name]['cam_trans'][0]if gender == 'female':model_path = female_model_pathfor k, v in bone_name_from_index.items():bone_name_from_index[k] = 'f_avg_' + velif gender == 'male':model_path = male_model_pathfor k, v in bone_name_from_index.items():bone_name_from_index[k] = 'm_avg_' + velif gender == 'character':model_path = character_model_pathfor k, v in bone_name_from_index_character.items():bone_name_from_index[k] = 'mixamorig1:' + velse:print('ERROR: Unsupported gender: ' + gender)sys.exit(1)# Limit target fps to source fpsif fps_target > fps_source:fps_target = fps_sourceprint('Gender:', gender)print('Number of source poses: ', poses.shape[0])print('Source frames-per-second: ', fps_source)print('Target frames-per-second: ', fps_target)print('--------------------------------------------------')setup_scene(model_path, fps_target)scene = bpy.data.scenes['Scene']sample_rate = int(fps_source / fps_target)scene.frame_end = (int)(poses.shape[0] / sample_rate)# Retrieve pelvis world position.# Unit is [cm] due to Armature scaling.# Need to make copy since reference will change when bone location is modified.armaturee = bpy.data.armatures[0]ob = bpy.data.objects['Armature']armature = ob.databpy.ops.object.mode_set(mode='EDIT')# get specific bone name 'Bone'pelvis_bone = armature.edit_bones[bone_name_from_index[0]]# pelvis_bone = armature.edit_bones['f_avg_Pelvis']pelvis_position = Vector(pelvis_bone.head)bpy.ops.object.mode_set(mode='OBJECT')source_index = 0frame = 1offset = np.array([0.0, 0.0, 0.0])while source_index < poses.shape[0]:print('Adding pose: ' + str(source_index))# Go to new framescene.frame_set(frame)process_pose(frame, poses[source_index], (trans[source_index] - offset), pelvis_position)source_index += sample_rateframe += 1return framedef rotate_armature(use):if use == True:# Switch to Pose Modebpy.ops.object.posemode_toggle()# Find the Armature & Bonesob = bpy.data.objects['Armature']armature = ob.databones = armature.bonesrootbone = bones[0]# Find the Root bonefor bone in bones:if "avg_root" in bone.name:rootbone = bonerootbone.select = True# Rotate the Root bone by 90 euler degrees on the Y axis. Set --rotate_Y=False if the rotation is not needed.bpy.ops.transform.rotate(value=1.5708, orient_axis='Y', orient_type='GLOBAL', orient_matrix=((1, 0, 0), (0, 1, 0), (0, 0, 1)), orient_matrix_type='GLOBAL', constraint_axis=(False, True, False), mirror=True, use_proportional_edit=False, proportional_edit_falloff='SMOOTH', proportional_size=1,use_proportional_connected=False, use_proportional_projected=False, release_confirm=True)# Revert back to Object Modebpy.ops.object.posemode_toggle()def export_animated_mesh(output_path):# Create output directory if neededoutput_dir = os.path.dirname(output_path)if not os.path.isdir(output_dir):os.makedirs(output_dir, exist_ok=True)# Fix Rotationrotate_armature(args.rotate_y)# Select only skinned mesh and rigbpy.ops.object.select_all(action='DESELECT')bpy.data.objects['Armature'].select_set(True)bpy.data.objects['Armature'].children[0].select_set(True)if output_path.endswith('.glb'):print('Exporting to glTF binary (.glb)')# Currently exporting without shape/pose shapes for smaller file sizesbpy.ops.export_scene.gltf(filepath=output_path, export_format='GLB', export_selected=True, export_morph=False)elif output_path.endswith('.fbx'):print('Exporting to FBX binary (.fbx)')bpy.ops.export_scene.fbx(filepath=output_path, use_selection=True, add_leaf_bones=False)elif output_path.endswith('.bvh'):bpy.ops.export_anim.bvh(filepath=output_path, root_transform_only=False)else:print('ERROR: Unsupported export format: ' + output_path)sys.exit(1)returnif __name__ == '__main__':if bpy.app.background:parser = argparse.ArgumentParser(description='Create keyframed animated skinned SMPL mesh from VIBE output')# parser.add_argument('--input', dest='input_path', type=str, default=r'D:\project\MHFormer-pose\output\9\output_3D\output_keypoints_3d.npz',  # '../demo/videos/sample_video2_results.npz',parser.add_argument('--input', dest='input_path', type=str, default=r'D:\project\MHFormer-pose\output\baitao\output_3D\output_keypoints_3d.npz',  # '../demo/videos/sample_video2_results.npz',help='Input file or directory')parser.add_argument('--output', dest='output_path', type=str, default='key_3d.fbx',  # '../demo/videos/sample_video2.fbx',help='Output file or directory')parser.add_argument('--fps_source', type=int, default=fps_source, help='Source framerate')parser.add_argument('--fps_target', type=int, default=fps_target, help='Target framerate')parser.add_argument('--gender', type=str, default=gender, help='Always use specified gender')parser.add_argument('--subject_id', type=int, default=-1, help='Detected person ID to use for fbx animation')parser.add_argument('--rotate_y', type=bool, default=True, help='whether to rotate the root bone on the Y axis by -90 on export. Otherwise it may be rotated incorrectly')args = parser.parse_args()input_path = args.input_pathoutput_path = args.output_pathprint('Input path: ' + input_path)print('Output path: ' + output_path)if not os.path.exists(input_path):print('ERROR: Invalid input path')sys.exit(1)fps_source = args.fps_sourcefps_target = args.fps_targetgender = args.genderstartTime = time.perf_counter()cwd = os.getcwd()# Turn relative input/output paths into absolute pathsif not input_path.startswith(os.path.sep):input_path = os.path.join(cwd, input_path)if not output_path.startswith(os.path.sep):output_path = os.path.join(cwd, output_path)if os.path.splitext(output_path)[1] not in support_formats:print('ERROR: Invalid output format, we only support', support_formats)sys.exit(1)# Process pose fileposes_processed = process_poses(input_path=input_path, gender=gender, fps_source=fps_source, fps_target=fps_target, subject_id=args.subject_id)export_animated_mesh(output_path)print('--------------------------------------------------')print('Animation export finished, save to ', output_path)print('Poses processed: ', poses_processed)print('Processing time : ', time.perf_counter() - startTime)print('--------------------------------------------------')

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