A.1 Bring Mixamo Animation to Omniverse

In this part, we are going to show how to bring characters and animation clips from Adobe Mixamo into Omniverse Create

Method one: use omniverse directly

0. Requirements

Warning

Please refer to the licenses (License) if necessary.

1. Download character & Animation from MIXAMO

Visit Adobe Mixamo, then save the character (e.g. peasant_girl.fbx) and the animation clip (e.g. Silly Dancing.fbx)

log image 1

Note

The animation clip can be saved with skeletal animation only (without skin).

2. Import FBX into Omniverse

(Optional) to convert FBX into USD, please call the python code:

from pathlib import Path

# character
test_data_path = "E:/researches/VRKitchen2.0-Tutorial/asset/mixamo/peasant_girl.fbx"

# for animation, the same story applies
# test_data_path = "E:/researches/VRKitchen2.0-Tutorial/asset/mixamo/Silly Dancing.fbx"


converter_manager = omni.kit.asset_converter.get_instance()
context = omni.kit.asset_converter.AssetConverterContext()
context.keep_all_materials = True
context.merge_all_meshes = True

# character
output_path = "E:/researches/VRKitchen2.0-Tutorial/asset/mixamo/peasant_girl_converted.usd"
# output_path = "E:/researches/VRKitchen2.0-Tutorial/asset/mixamo/silly_dancing_converted.usd"

task = converter_manager.create_converter_task(test_data_path, output_path, None, context)

success = await task.wait_until_finished()
assert success, "convert not successful"
assert Path(output_path).is_file()

3. Load character and animation into Omnvierse

Finally, load character and select your animation clip in Omnvierse.

import a c1 image

Note

We can open USD file from script

omni.usd.get_context().open_stage_async(output_path)

  1. Now you can see the mixamo animation:

amim1 image

Method two: use Maya USD converter

Requirements

Warning

Please refer to the licenses (License) if necessary.

Download character & Animation from MIXAMO

Visit Adobe Mixamo, then save the character (e.g. peasant_girl.fbx) and the animation clip (e.g. Silly Dancing.fbx)

log image

Note

The animation clip can be saved with skeletal animation only (without skin).

Import FBX into maya

import image

We can also try import with Python code:

import maya.cmds as cmds

fbx_path = "E:/researches/VRKitchen2.0-Tutorial/asset/mixamo/peasant_girl.fbx"
cmds.file(fbx_path, i=True, type='Fbx')

Group character and export

group image
export c image 
cmds.group( 'Peasant_girl', 'Hips', n='Character')

# file -force -options ";exportUVs=1;exportSkels=auto;exportSkin=auto;exportBlendShapes=0;exportDisplayColor=0;exportColorSets=1;defaultMeshScheme=catmullClark;animation=0;eulerFilter=0;staticSingleSample=0;startTime=0;endTime=115;frameStride=1;frameSample=0.0;defaultUSDFormat=usdc;parentScope=;shadingMode=useRegistry;convertMaterialsTo=[UsdPreviewSurface];exportInstances=1;exportVisibility=1;mergeTransformAndShape=1;stripNamespaces=0" -typ "USD Export" -pr -es "E:/researches/VRKitchen2.0-Tutorial/asset/mixamo/peasant_girl.usd";

options = ";exportUVs=1;exportSkels=auto;exportSkin=auto;exportBlendShapes=0;exportDisplayColor=0;exportColorSets=1;defaultMeshScheme=catmullClark;animation=0;eulerFilter=0;staticSingleSample=0;startTime=0;endTime=115;frameStride=1;frameSample=0.0;defaultUSDFormat=usdc;parentScope=;shadingMode=useRegistry;convertMaterialsTo=[UsdPreviewSurface];exportInstances=1;exportVisibility=1;mergeTransformAndShape=1;stripNamespaces=0"

usd_path = "E:/researches/VRKitchen2.0-Tutorial/asset/mixamo/peasant_girl.usd"
cmds.file(usd_path, force = True, options = options, type="USD Export", exportSelected=True, preserveReferences=True)

Import and export animation

Now we do the same step for the animation clip.

export a image 
# import animation clip
fbx_path = "E:/researches/VRKitchen2.0-Tutorial/asset/mixamo/Silly Dancing.fbx"
cmds.file(fbx_path, i=True, type='Fbx')

# group skeleton only
cmds.group('Hips', n='Character')

# output animation
max_time = int(cmds.playbackOptions(maxTime=-1, q=True)) # get timeline max time

# file -force -options ";exportUVs=1;exportSkels=auto;exportSkin=auto;exportBlendShapes=0;exportDisplayColor=0;exportColorSets=1;defaultMeshScheme=catmullClark;animation=1;eulerFilter=0;staticSingleSample=0;startTime=0;endTime=100;frameStride=1;frameSample=0.0;defaultUSDFormat=usdc;parentScope=;shadingMode=useRegistry;convertMaterialsTo=[UsdPreviewSurface];exportInstances=1;exportVisibility=1;mergeTransformAndShape=1;stripNamespaces=0" -typ "USD Export" -pr -es "E:/researches/VRKitchen2.0-Tutorial/asset/mixamo/silly_dance.usd";

options =f";exportUVs=1;exportSkels=auto;exportSkin=auto;exportBlendShapes=0;exportDisplayColor=0;exportColorSets=1;defaultMeshScheme=catmullClark;animation=1;eulerFilter=0;staticSingleSample=0;startTime=0;endTime={max_time};frameStride=1;frameSample=0.0;defaultUSDFormat=usdc;parentScope=;shadingMode=useRegistry;convertMaterialsTo=[UsdPreviewSurface];exportInstances=1;exportVisibility=1;mergeTransformAndShape=1;stripNamespaces=0"

usd_path = "E:/researches/VRKitchen2.0-Tutorial/asset/mixamo/silly_dance2.usd"
cmds.file(usd_path, force = True, options = options, type="USD Export", exportSelected=True, preserveReferences=True)

Load character and animation into Omnvierse

Finally, load character and select your animation clip in Omnvierse.

import a c image

Now you can see the mixamo animation:

amim image