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Comment by svet_0 | Hacker News Reader

Small bug: occasionally there are multiple matching pairs, although only 1 works (screenshot: https://ibb.co/JpRp0Pm)

Additionally, the auto rotation itself is mostly confusing, could be better to enable manual mouse rotation.

Cool game nonetheless!

Edit: The bug seems to be that shapes with different "DNA" can still be isometric in some cases: https://github.com/0xf00ff00f/rotator/blob/master/demo.cc#L4...

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Ouch. Thank you so much for noticing this! Looks like I need a more robust test.

Ismorphism is hard to detect, even in reduced spaces. Really hard in arbitrary graphs.

For a "fast filter" generate the center of gravity for each (just the average of the voxel points as doubles) and abs+sort the resulting vector and assume they match if the "Sorted Cog Vector" matches. It will have false positives sometimes but no false negatives.

Great suggestion, thanks!

In chemistry, there is the problem of normalization of molecule identifiers that looks like this problem.

https://en.wikipedia.org/wiki/International_Chemical_Identif...

Ok so I'm not crazy. The shapes moving had me second guessing myself trying to compare them.

Hey, this should be fixed now. Thanks again!

I still run into the bug

https://i.ibb.co/y4p4JSM/20220220-231734.jpg

I feel stupid. Now it should be fixed, for real.

Thank you!

I encountered the same bug and it was also a donut kind of shape, maybe something to do with the closing of the loop?

Probably. L-U-R-D is the mirror of R-D-L-U but not the mirror of L-D-R-U, although isometric to both.

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