mikolalysenko/alpha-shape

Any dimensional alpha shapes

alpha-shape's Issues

Just asking. Is it working

I suck at math. I just thought I'd try out your library. I probably don't understand alpha shapes but ...

I gave it a sphere point set and I can't seem to get it to generate what I expect. I see a few large triangles etc... Is that expected?

https://jsfiddle.net/greggman/L16jkzbs/

How to use alpha-shapes with GeoJSON

The demo you provided looks great. Good work!

I tried to use your code to generate an alpha-shape around geographical coordinates, but here I am a bit stuck on how to use your return value.
My code uses GeoJSON, so I first extracted points to calculate the alpha-shape from.

I am not sure what the returned value means, but first I thought that the returned array will contain coordinates as well. That's obviously not the case, since the values returned are far off the coordinates given (my coordinates are around 11.35 and 46.50, the values returned are often above 100).
So I thought that the actual coordinates need to be read from the input value (that the returned array references the values in the input array).
Using the parameter this way works somehow, but does not deliver anything near to the result I expected.

I created a JSFiddle 1 with the input array and the expected result: http://jsfiddle.net/Niko_K/weqfy733/
Could you please elaborate a bit on how to use your function's return value and how to exactly use you code to create an alpha-shape that is near the exact solution given in the JSFiddle (and not the red one that I get when calling your function with an alpha value of 10)?

Bug in the demo page

In the demo page, clicking on the slider to change alpha value, unintentionally creates a new point and modifies the set on which the test has to be done.

3D

Can I make a 3D shape from 3D point cloud with this?

Just asking. Is it working

I suck at math. I just thought I'd try out your library. I probably don't understand alpha shapes but ...

I gave it a sphere point set and I can't seem to get it to generate what I expect. I see a few large triangles etc... Is that expected?

https://jsfiddle.net/greggman/L16jkzbs/