ThreeJS: 3D Object Area Calculation (Triangulated)

Question

I need to calculate the area/surface of a whole object in threeJS. Thats what I have:

    var _len = object.geometry.faces.length,
        _area = 0.0;

    if          


        

Answer 1

You are using lengthSq(), is that right? I guess you need the length of the cross vector, not the length squared.