| ACL Plugin v2.1.0 | ACL Plugin v2.0.0 | UE v5.2.0 | |
|---|---|---|---|
| Compressed size | 67.92 MB | 75.55 MB | 99.74 MB |
| Compression ratio | 21.05 : 1 | 18.92 : 1 | 14.33 : 1 |
| Compression time | 2m 48.78s | 2m 19.06s | 5m 54.28s |
| Compression speed | 8671.99 KB/sec | 10525.35 KB/sec | 4131.39 KB/sec |
| Max ACL error | 0.1299 cm | 0.0833 cm cm | 0.1520 cm |
| Max UE error | 0.0662 cm | 0.0816 cm | 0.0995 cm |
| ACL Error 99th percentile | 0.0092 cm | 0.0088 cm | 0.0283 cm |
| Samples below ACL error threshold | 99.61 % | 99.93 % | 49.12 % |
ACL was smaller for 2533 clips (99.96 %)
ACL was more accurate for 2500 clips (98.66 %)
ACL has faster compression for 2518 clips (99.37 %)
ACL was smaller, better, and faster for 2483 clips (97.99 %)
Would the ACL Plugin have been included in the Automatic Compression permutations tried, it would have won for 2534 clips (100.00 %)
Note: Numbers for ACL 2.0 were extracted with UE 4.25.
To compile the statistics, the animation database from Carnegie-Mellon University is used. The raw animation clips in FBX form can be found on the Unity asset store here. They were converted to the ACL file format using the fbx2acl script. Data available upon request, it is far too large for GitHub.
- Number of clips: 2534
- Sample rate: 24 FPS
- Total duration: 9h 49m 37.58s
- Raw size: 1429.38 MB (10x float32 * num bones * num samples)
To measure and extract the compression statistics, the provided commandlet is used along with a python script to parse the results.
The ACL Plugin uses the default settings with an error threshold of 0.01cm while UE uses the Automatic Compression with an error threshold (master tolerance) of 0.1 cm. Both error thresholds used are suitable for production use. The 99th percentile and the number of samples below the ACL error threshold are calculated by measuring the error with ACL on every bone at every sample.
ACL and UE both use separate methods to measure the error and both values are shown for transparency.