The avatar for @msurguy
Maksim Surguy
Design Technologist, creator of plotterfiles.com and drawingbots.net, open source tools creator. On twitter: @msurguy
Published
Edited
May 14, 2020
Fork of Hillshader
1 star
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function getDerivatives(top, left, bottom, right) {
const dzdx = right - left;
const dzdy = top - bottom;
return {
dzdx,
dzdy,
}
}
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getSlope = (dzdx, dzdy, z=.2) => Math.atan(z * Math.sqrt(dzdx ** 2 + dzdy ** 2)); // the z factor controls how exaggerated the peaks look
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getAspect = (dzdx, dzdy) => {
return Math.atan2(-dzdy, -dzdx);
}
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function getReflectance(aspect, slope, sunAzimuth, sunElevation) {
return Math.cos(Math.PI * .5 - aspect - sunAzimuth) * Math.sin(slope) * Math.sin(Math.PI * .5 - sunElevation) +
Math.cos(slope) * Math.cos(Math.PI * .5 - sunElevation);
}
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