Interpolation Method for Projection Transition in d3.js -


i attempting toggle between 2 animations while having them interactive (drag/zoom) - orthographic , equirectangular. grateful if shed light on issues i'm explain. without explanation, math little on head.

my interpolation method based off of extremely helpful answer: how smooth transition map reprojection in d3 js

i've created 2 similar examples on jsfiddle - 1 starts out orthographic projection without being interpolated , is. on line 24 can switch between interpolated projection , normal orthographic.

these identical except projection getting applied (line 24/25):

you'll notice visually quite different, brings me questions:

  1. i believe way handle toggle create 2 interpolating projections (as seen in jsfiddle). 1 going orthographic equirectangular (ortho2equi), doing opposite. apply them path when appropriate (equi2ortho). or there better more efficient way?
  2. you'll notice interpolated method causes globe lose of styling - centering, inner blue sphere, , clipping. loss of clipangle() seems main culprit in interpolated orthographic projection. there anyway keep transform(), clipangle(), rotate() , scale() on vanilla orthographic? suspect they'll need "hard coded" in each of interpolation methods?
  3. what purpose of 3 deletes @ bottom of interpolation method?

thank you!


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