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34 lines
929 B
34 lines
929 B
1 year ago
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import {asin, atan2, cos, sin, sqrt} from "./math";
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export function spherical(cartesian) {
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return [atan2(cartesian[1], cartesian[0]), asin(cartesian[2])];
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}
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export function cartesian(spherical) {
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var lambda = spherical[0], phi = spherical[1], cosPhi = cos(phi);
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return [cosPhi * cos(lambda), cosPhi * sin(lambda), sin(phi)];
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}
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export function cartesianDot(a, b) {
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return a[0] * b[0] + a[1] * b[1] + a[2] * b[2];
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}
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export function cartesianCross(a, b) {
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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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}
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// TODO return a
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export function cartesianAddInPlace(a, b) {
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a[0] += b[0], a[1] += b[1], a[2] += b[2];
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}
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export function cartesianScale(vector, k) {
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return [vector[0] * k, vector[1] * k, vector[2] * k];
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}
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// TODO return d
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export function cartesianNormalizeInPlace(d) {
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var l = sqrt(d[0] * d[0] + d[1] * d[1] + d[2] * d[2]);
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d[0] /= l, d[1] /= l, d[2] /= l;
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}
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