Luke The Dev
29 lines
814 B
JavaScript
29 lines
814 B
JavaScript
async function main() {
|
|
const THREE = await import("three");
|
|
|
|
// Earth radius = 2.
|
|
// latitude 40.7, longitude -74.
|
|
function latLonToVector3(lat, lon, radius) {
|
|
const phi = (90 - lat) * (Math.PI / 180);
|
|
// three.js spherical maps usually have lon=0 at +Z, and lon=90 at +X.
|
|
const theta = (lon + 90) * (Math.PI / 180); // Wait, standard spherical coords in three.js.
|
|
|
|
const x = -radius * Math.sin(phi) * Math.cos(theta);
|
|
const y = radius * Math.cos(phi);
|
|
const z = radius * Math.sin(phi) * Math.sin(theta);
|
|
|
|
return new THREE.Vector3(x, y, z);
|
|
}
|
|
|
|
// NY.
|
|
console.log("NY:", latLonToVector3(40.7, -74, 2));
|
|
|
|
// Let's try London.
|
|
console.log("London:", latLonToVector3(51.5, 0, 2));
|
|
|
|
// Let's try SF.
|
|
console.log("SF:", latLonToVector3(37.7, -122, 2));
|
|
}
|
|
|
|
void main();
|