Hi. I need to devide one of the axes ex. “x” (50mm height) / 1 (1mm height of layer). after I need to calculate volume of each layer. here is code with formula
import React, { useRef, useEffect } from 'react';
import { useLoader } from '@react-three/fiber';
import { STLLoader } from 'three/examples/jsm/loaders/STLLoader';
import * as THREE from 'three';
const STLModel = ({ stlFile, onDimensionsCalculated }) => {
const geometry = useLoader(STLLoader, stlFile);
const ref = useRef();
useEffect(() => {
const calculateDimensionsAndVolume = () => {
if (ref.current) {
const box = new THREE.Box3().setFromObject(ref.current);
const dimensions = box.getSize(new THREE.Vector3());
//formula for volume
const getVolume = (geometry) => {
let position = geometry.attributes.position;
let faces = position.count / 3;
let sum = 0;
let p1 = new THREE.Vector3(),
p2 = new THREE.Vector3(),
p3 = new THREE.Vector3();
for (let i = 0; i < faces; i++) {
p1.fromBufferAttribute(position, i * 3 + 0);
p2.fromBufferAttribute(position, i * 3 + 1);
p3.fromBufferAttribute(position, i * 3 + 2);
sum += signedVolumeOfTriangle(p1, p2, p3);
}
return sum;
};
const signedVolumeOfTriangle = (p1, p2, p3) => {
return p1.dot(p2.cross(p3)) / 6.0;
};
const volume = getVolume(geometry);
onDimensionsCalculated(dimensions, volume);
}
};
calculateDimensionsAndVolume();
}, [geometry, onDimensionsCalculated]);
return (
<group ref={ref}>
<mesh geometry={geometry}>
<meshMatcapMaterial />
</mesh>
</group>
);
};
export default STLModel;
