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fire/gltf_merge_anim.py

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Created March 3, 2022 07:07
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  1. @scurest scurest created this gist Aug 16, 2017.
    59 changes: 59 additions & 0 deletions gltf_merge_anim.py
    View file
    Original file line number Diff line number Diff line change
    @@ -0,0 +1,59 @@
    #!/bin/env python
    """Merge mutiple glTF 2.0 animations into one."""
    import json
    import sys

    def merge(gltf):
    # Maps (node, path) to (input, output, interpolation)
    target_to_sampler = {}
    for animation in gltf.get('animations', []):
    for channel in animation['channels']:
    target_json = channel['target']
    if 'node' not in target_json:
    continue
    target = (target_json['node'], target_json['path'])
    if target in target_to_sampler:
    raise Exception("Can't merge; multiple channels have the same target")
    sampler_json = animation['samplers'][channel['sampler']]
    sampler = (
    sampler_json['input'],
    sampler_json['output'],
    sampler_json.get('interpolation', 'LINEAR')
    )
    target_to_sampler[target] = sampler

    channels = []
    samplers = []
    for i, (target, sampler) in enumerate(target_to_sampler.items()):
    new_channel = {
    'sampler': i,
    'target': {
    'node': target[0],
    'path': target[1]
    }
    }
    new_sampler = {
    'input': sampler[0],
    'output': sampler[1],
    }
    if sampler[2] != 'LINEAR':
    new_sampler['interpolation'] = sampler[2]
    channels.append(new_channel)
    samplers.append(new_sampler)

    animations = [{
    'channels': channels,
    'samplers': samplers
    }]
    gltf['animations'] = animations


    def convert(infile, outfile):
    with open(infile, "rb") as f:
    gltf = json.load(f)
    merge(gltf)
    with open(outfile, "w+") as f:
    json.dump(gltf, f, indent=4)


    convert(sys.argv[1], sys.argv[2])