Volume of Mesh Calculation With WebGL

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//Created by Ken on Oct 20,2016 for volume compute when uploadfunction SignedVolumeOfTriangle(p1, p2, p3) {   var v321 = p3.X*p2.Y*p1.Z;   var v231 = p2.X*p3.Y*p1.Z;   var v312 = p3.X*p1.Y*p2.Z;   var v132 = p1.X*p3.Y*p2.Z;   var v213 = p2.X*p1.Y*p3.Z;   var v123 = p1.X*p2.Y*p3.Z;   var singnedVolume=(1/6)*(-v321 + v231 + v312 - v132 - v213 + v123);   return singnedVolume;}function VolumeOfMesh(points) {       var i= 0,vols=0;   var P1,P2,P3;   do   {      P1={X:points[i],Y:points[i+1],Z:points[i+2]};      P2={X:points[i+3],Y:points[i+4],Z:points[i+5]};      P3={X:points[i+6],Y:points[i+7],Z:points[i+8]};      vols+=SignedVolumeOfTriangle(P1, P2, P3);      i+=9;   }   while (i<points.length);   return customRound(Math.abs(vols)/1000,2);}function customRound(number,fractiondigits){   with(Math){      return round(number*pow(10,fractiondigits))/pow(10,fractiondigits);   }}

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