src/STL.php
public function setFacetNormal(int $position, STLFacetNormal $facetNormal) : STL
    {
        $this->facets[$position] = $facetNormal;
        return $this;
    }
public function setFacetNormal(int $position, STLFacetNormal $facetNormal) : STL
    {
        $this->facets[$position] = $facetNormal;
        return $this;
    }
public function setFacetNormal ( int $ position , STLFacetNormal $ facetNormal ) : STL { $ this -> facets [ $ position ] = $ facetNormal ; return $ this ; }
Sets a facet normal at a given position.

@param int $position
@param STLFacetNormal $facetNormal
@return STL
Sets a facet normal at a given position .