| 1 | import {asin, atan2, cos, sin, sqrt} from "./math.js";
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| 2 |
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| 3 | export function spherical(cartesian) {
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| 4 | return [atan2(cartesian[1], cartesian[0]), asin(cartesian[2])];
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| 5 | }
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| 6 |
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| 7 | export function cartesian(spherical) {
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| 8 | var lambda = spherical[0], phi = spherical[1], cosPhi = cos(phi);
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| 9 | return [cosPhi * cos(lambda), cosPhi * sin(lambda), sin(phi)];
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| 10 | }
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| 11 |
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| 12 | export function cartesianDot(a, b) {
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| 13 | return a[0] * b[0] + a[1] * b[1] + a[2] * b[2];
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| 14 | }
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| 15 |
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| 16 | export function cartesianCross(a, b) {
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| 17 | return [a[1] * b[2] - a[2] * b[1], a[2] * b[0] - a[0] * b[2], a[0] * b[1] - a[1] * b[0]];
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| 18 | }
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| 19 |
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| 20 | // TODO return a
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| 21 | export function cartesianAddInPlace(a, b) {
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| 22 | a[0] += b[0], a[1] += b[1], a[2] += b[2];
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| 23 | }
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| 24 |
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| 25 | export function cartesianScale(vector, k) {
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| 26 | return [vector[0] * k, vector[1] * k, vector[2] * k];
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| 27 | }
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| 28 |
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| 29 | // TODO return d
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| 30 | export function cartesianNormalizeInPlace(d) {
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| 31 | var l = sqrt(d[0] * d[0] + d[1] * d[1] + d[2] * d[2]);
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| 32 | d[0] /= l, d[1] /= l, d[2] /= l;
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| 33 | }
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