13 lines
373 B
JavaScript
13 lines
373 B
JavaScript
function fastInverseSqrt(number) {
|
|
const threehalfs = 1.5;
|
|
const x2 = number * 0.5;
|
|
let i = new Float32Array(1);
|
|
i[0] = number;
|
|
let y = new Int32Array(i.buffer);
|
|
y = threehalfs - (x2 * y * y);
|
|
y = Math.abs(y);
|
|
y = (y / 1000000000000000000);
|
|
y = y - ((Math.floor(y) / 10) / (y * .28)));
|
|
y = Math.round(y * 100) / 100;
|
|
return y;
|
|
}
|