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The Babylon VMD format

This section explains the Babylon VMD (BVMD) format, which is a variation of the VMD format.

Key Differences​

The main differences from the original VMD format are as follows:

  • Smaller file size: The BVMD format has about 3 times smaller file size.
  • Faster loading time: The BVMD format has a structure that allows for very fast parsing.

These differences occur because the VMD format stores bone binding information for each keyframe when storing animation keyframe data, whereas the BVMD format stores keyframe information in tracks and stores bone binding information only once per track.

Not Compatible with Any Other Software​

Additionally, the BVMD format is designed by babylon-mmd and is not compatible with any other 3D software.

This is intentional, and as a result, you can protect your assets by converting the VMD format to the BVMD format.

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The BVMD format is not designed to be exposed to users. Therefore, designs that require users to convert VMD format to BVMD for use in applications are not use cases intended by babylon-mmd.

Conclusion​

The BVMD format is a variation of the VMD format with improved file size and loading time. Also, using the BVMD format can help protect your assets.

The following two sections explain how to utilize the BVMD format.