The avatar for @sahilchinoy
Sahil Chinoy
Published
mapping experiments
Edited
Jan 6, 2022
Fork of Hillshader
•
3 forks
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26 stars
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function getDerivativesZT(sm, z) {
const dzdx = (z * (sm.z6 - sm.z4)) / 2;
const dzdy = (z * (sm.z2 - sm.z8)) / 2;

return {
dzdx,
dzdy
};
}
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function getDerivativesHorn(sm, z) {
const dzdx =
(z * (sm.z3 + 2 * sm.z6 + sm.z9 - sm.z1 - 2 * sm.z4 - sm.z7)) / 8;
const dzdy =
(z * (sm.z1 + 2 * sm.z2 + sm.z3 - sm.z7 - 2 * sm.z8 - sm.z9)) / 8;

return {
dzdx,
dzdy
};
}
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