Broken New Taipei area in 3dmap2 about twgeojson HOT 3 CLOSED

http://imgur.com/08OWFmp

It gets better if hole removed.
http://imgur.com/w2M3L3c

from twgeojson.

Fixed at 73dc0b1

The THREE.Shape.Utils.triangulateShape() can't work on polygon with holes and some concave polygon, like the area of New Taipei City.

It's known issue ( Thanks to yllan )
mrdoob/three.js#907
mrdoob/three.js#3386

I found the commented code : THREE.Shape.Utils.triangulate2(), and injected it into THREE.Shape.Utils as a replacement for triangulateShape(). The reason for injection instead of change Three.js is, the work was done before, but not subject for merge.

Then, the triangulation is broken again at New Taipei City and Hualien, since poly2try doesn't accept repeated vertices. So, I fixed it by adding filter functions with tolerance value.

We may ask if Three.js accept customised triangulation function, or to provide alternative option when poly2tri is present.

from twgeojson.

為何會有 repeated vertex 呢？是不是我們應該從原始 json 檔裡把這些重複的點清乾淨？

from twgeojson.