Live data from Hacker News

Show HN: Test your shape rotation skills

0xf00ff00f.github.io

71–80 of 210 posts

Re: Show HN: Test your shape rotation skills

#71
post #67

Curious about group theory take on this. It seems that symmetry helps to easily exclude multiple shapes at the beginning of each round.

If you can turn one into the other with a single reflection, then you can't rotate them. Two reflections, and you can.

Re: Show HN: Test your shape rotation skills

#73
First game

- I briefly go through each shapes

- Anchor on a particular shape

- Check other shapes based on that shapes

- Realize the number of cubes is the distinguishing factor not the shape itself

- Exclude the first focused shape from future comparison

- Try to compare 2 shapes randomly

- And after 4 clicks of match attempts I find a match

2nd Game

- Go through the first 2 rounds with ease as they were essentially in the same row or the same column

- Second game I get confused as the obvious matches aren't obvious

- I time out

- I didn't even notice how the timing worked in the first game

3rd game

- I try to count the number of blocks between each 'lines' of shapes

- But for shapes that have 3 or more turn of these lines matching them is very difficult

Re: Show HN: Test your shape rotation skills

#74
post #26

I know it's not the point, but I find it way easier to just brute force it. Got 31 pairs matched that way (three matches in the last two seconds, even).

Makes sense, you have to wait to see enogh information to be able to actually submit choices, vs being able to start brute forcing immediately

Re: Show HN: Test your shape rotation skills

#75
post #32

10 shapes 12 sec/shape (2nd try, no brute-force, mobile) 16 shapes (3rd try) 18 shapes (4th try) 24 shapes (5th try, no brute-force) P.S. I had 7 years of art school in addition to engineering

Wow, that's impressive. After figuring out the game I got 8 shapes which I thought was good!

Re: Show HN: Test your shape rotation skills

#77

First game - I briefly go through each shapes - Anchor on a particular shape - Check other shapes based on that shapes - Realize the number of cubes is the distinguishing factor not the shape itself - Exclude the first focused shape from future comparison - Try to compare 2 shapes randomly - And after 4 clicks of match attempts I find a match 2nd Game - Go through the first 2 rounds with ease as they were essentially…

First game

- I quickly glance each shape

- Select the ones that "feel" more similar.

- Scored 13 on my first run

Sometimes I think thinking less is better. Same for a lot of sports, things that require careful motor control and fast-pacing.

Re: Show HN: Test your shape rotation skills

#78
post #33

Scored 7 my first go but that was aided by one or two that were more or less had the same orientation and could spotted pretty easily.

I thought I'd be good at this since I do 3D editing all day, but apparently not. In my first try I couldn't get even one. Practicing some more I got up to 4 in a game. I wonder if this game can distinguish between people who have rich mental imagery and those who don't?

When you don't know the shapes, you have to do lots and lots of comparisons since you don't know what info you're missing behind the shape.

Once you do it a couple times, you can skip a lot of the conparison

Re: Show HN: Test your shape rotation skills

#79

Earlier quoted context omitted.

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.

[deleted]

Re: Show HN: Test your shape rotation skills

#80
post #8

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...

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

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

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

Post reply on HN