The World Is Not Flat

Rendering shapes defined by latitude and longitude with WebGL2.

Only tested on Chrome so far.

Build

npm run test

Use arrow keys to pan and +/- to zoom in/out

TWINF allows to draw shapes defined by latitude and longitude on a canvas using the WebGL2 context.

The following transformations are applied to shapes:

In the CPU: conversion from latitude/longitude coordinate system to geocentric coordinate system assuming a spherical earth model
In the CPU: triangulation of spherical and planar polygons
In the GPU: conversion from geocentric coordinate system to stereographic coordinate system
In the GPU: conversion from stereographic coordinate system to canvas coordinate system
In the GPU: conversion from canvas to WebGL clipspace