Add volume calculator for 3d mesh

[isalgadof]

Description

Three has no native method to calculate mesh's volumes.

Solution

Add a method (mesh.volume) to retrieve the calculated volume of the object-mesh.

Alternatives

Pass through a method using an import for 'three-volume' package

Additional context

https://www.npmjs.com/package/three-volume

[statusunknown418]

what's the state of this PR? bumping for visibility and bc seems like a very useful utility

[Mugen87]

what's the state of this PR?

This is an issue. The respective PR is #27906.

Unfortunately, the OP has to honor the feedback in #27906 (comment) to get the code merged. As long as the code is not in the three repository, you can still use three-volume.

[statusunknown418]

@Mugen87 I'm trying to use the lib but getting this error

TypeError: Cannot read properties of undefined (reading 'attributes')
    at calculateVolume (webpack-internal:///(rsc)/./node_modules/.pnpm/three-volume@2.0.5/node_modules/three-volume/index.js:10:29)
    at POST (webpack-internal:///(rsc)/./src/app/api/analyze/route.ts:29:85)

using this

import { NextResponse, type NextRequest } from "next/server";
import { Box3, Vector3 } from "three";
import { ThreeVolume } from "three-volume";
import { STLLoader } from "three/addons";

export const POST = async (req: NextRequest) => {
  const body = (await req.json()) as { url: string };

  if (!body.url) {
    return NextResponse.json({ error: "No url provided" }, { status: 400 });
  }

  const t1 = performance.now();
  const fileFetch = await fetch(body.url);
  const arrayBuffer = await fileFetch.arrayBuffer();

  const stlLoader = new STLLoader();

  const fileV3 = stlLoader.parse(arrayBuffer);
  const box = new Box3().setFromArray(fileV3.getAttribute("position").array);
  const size = new Vector3();
  const computedVolume = ThreeVolume(fileV3);
  const t2 = performance.now();

  return NextResponse.json(
    { help: true, dimensions: box.getSize(size), computedVolume, took: t2 - t1 },
    { status: 200 },
  );
};

does someone has any solution?

[Mugen87]

Do you mind reporting this issue at https://github.com/isalgadof/Three-volume instead?