julian

I needed a PHP-script that gives me the volume of an STL-File for my 3D-Printer.
I took the script from here and modified it to accept STL-Files, which are encoded in ASCII
In most of the cases the volume is an overestimate, but it works.

<?php

function stlhandling($volume=0,$toobig=0,$filepath){
$x_max = 0;
$y_max = 0;
$z_max = 0;
$x_min = 0;
$y_min = 0;
$z_min = 0;
//$filepath = "4.stl";
//$filepath = "k.stl";
$fp = fopen($filepath, "rb");

$section = file_get_contents($filepath, NULL, NULL, 0, 79);

$sizeoff=filesize( $filepath );

fseek($fp, 80);
$data = fread($fp, 4);

$numOfFacets = unpack("I", $data);
//echo $numOfFacets[1];
$pointer=12.5*$i+4;
$binary=1;
if(($numOfFacets[1]*12.5)>$sizeoff)$binary=0;

if($binary==0){fseek($fp, 0);
fgets($fp,100);
fgets($fp,100);
fgets($fp,100);
//echo "ascii";
}

echo $numOfFacets[1];
for ($i = 0; $i < $numOfFacets[1]; $i++){
 //Start Normal Vector
if($binary==1){
 $data = fread($fp, 4);
 $hold = unpack("f", $data);
 $normalVectorsX[$i] = $hold[1];
 $data = fread($fp, 4);
 $hold = unpack("f", $data);
 $normalVectorsY[$i] = $hold[1];
 $data = fread($fp, 4);
 $hold = unpack("f", $data);
 $normalVectorsZ[$i] = $hold[1];
 //End Normal Vector
 //Start Vertex1
 $data = fread($fp, 4);
 $hold = unpack("f", $data);
 $vertex1X[$i] = $hold[1];
 $data = fread($fp, 4);
 $hold = unpack("f", $data);
 $vertex1Y[$i] = $hold[1];
 $data = fread($fp, 4);
 $hold = unpack("f", $data);
 $vertex1Z[$i] = $hold[1];
 //End Vertex1
 //Start Vertex2
 $data = fread($fp, 4);
 $hold = unpack("f", $data);
 $vertex2X[$i] = $hold[1];
 $data = fread($fp, 4);
 $hold = unpack("f", $data);
 $vertex2Y[$i] = $hold[1];
 $data = fread($fp, 4);
 $hold = unpack("f", $data);
 $vertex2Z[$i] = $hold[1];
 //End Vertex2
 //Start Vertex3
 $data = fread($fp, 4);
 $hold = unpack("f", $data);
 $vertex3X[$i] = $hold[1];
 $data = fread($fp, 4);
 $hold = unpack("f", $data);
 $vertex3Y[$i] = $hold[1];
 $data = fread($fp, 4);
 $hold = unpack("f", $data);
 $vertex3Z[$i] = $hold[1];
 //End Vertex3
 //Attribute Byte Count
 $data = fread($fp, 2);
 $hold = unpack("S", $data);
 $abc[$i] = $hold[1];
 }
 if($binary==0){

 //echo substr(fgets($fp,100),13);
 $vertexarray1=explode(" ",substr(fgets($fp,150),13));
 $vertexarray2=explode(" ",substr(fgets($fp,150),13));
 $vertexarray3=explode(" ",substr(fgets($fp,150),13));
 //echo "\n k".floatval($vertexarray1[0]);
 //echo "\n".fgets($fp,100);
 $vertex1X[$i]=$vertexarray1[0];
 $vertex1Y[$i]=$vertexarray1[1];
 $vertex1Z[$i]=$vertexarray1[2];
 $vertex2X[$i]=$vertexarray2[0];
 $vertex2Y[$i]=$vertexarray2[1];
 $vertex2Z[$i]=$vertexarray2[2];
 $vertex3X[$i]=$vertexarray3[0];
 $vertex3Y[$i]=$vertexarray3[1];
 $vertex3Z[$i]=$vertexarray3[2];
 fgets($fp,80);
 fgets($fp,80);
 $ko=fgets($fp,80);
 //echo substr($ko,0,8)."\n ";
 if(substr($ko,0,8)=="endsolid")$numOfFacets[1]=$i-1;//found the end of the file
 fgets($fp,190);

}

 $x_vals = array($vertex1X[$i], $vertex2X[$i], $vertex3X[$i]);
 $y_vals = array($vertex1Y[$i], $vertex2Y[$i], $vertex3Y[$i]);
 $z_vals = array($vertex1Z[$i], $vertex2Z[$i], $vertex3Z[$i]);
 if(max($x_vals) > $x_max) {
 $x_max = max($x_vals);
 }
 if(max($y_vals) > $y_max) {
 $y_max = max($y_vals);
 }
 if(max($z_vals) > $z_max) {
 $z_max = max($z_vals);
 }
 if(min($x_vals) < $x_min) {
 $x_min = min($x_vals);
 }
 if(min($y_vals) < $y_min) {
 $y_min = min($y_vals);
 }
 if(min($z_vals) < $z_min) {
 $z_min = min($z_vals);
 }

}
$x_dim = $x_max - $x_min;
$y_dim = $y_max - $y_min;
$z_dim = $z_max - $z_min;

$volume = $x_dim*$y_dim*$z_dim;

$raw_cost = 15;
$tray_cost = $raw_cost;
$material_cost = $raw_cost*$volume*1.02;
$support_cost = $raw_cost*2;
$total = $tray_cost + $material_cost + $support_cost;
echo "$".number_format($total, 2, '.', ',');
$fits=0;
if($x_dim<140 && $x_dim<140 && $z_dim<90)
 $fits=1;
if($x_dim<140 && $x_dim<90 && $z_dim<140)
 $fits=1;
if($x_dim<90 && $x_dim<140 && $z_dim<140)
 $fits=1;
$volumeovercharge=$volume/30000;

$volumeovercharge=round($volumeovercharge,0);

//is volume < 0.5
if($volumeovercharge==0 && $volume>0)$volumeovercharge=1;
if($fits==0)$volumeovercharge=-1;
echo "\n ".$x_dim;echo "\n ";
echo "$".number_format($volume, 2, '.', ',');
echo "\n ".$y_dim;
echo "\n ".$z_dim;
echo "\n ".$fits;
echo "\n k".$volumeovercharge;

return $volumeovercharge;
}
//stlhandling(0,0,"4.stl");
?>