optional<Vector3> Plane::intersectLine( const Line3& line, Vector3& target ) {
auto direction = line.delta();
auto denominator = normal.dot( direction );
if ( denominator == 0 ) {
// line is coplanar, return origin
if( distanceToPoint( line.start ) == 0 ) {
target.copy( line.start );
return target;
}
// Unsure if this is the correct method to handle this case.
return nullptr;
}
auto t = - ( line.start.dot( normal ) + constant ) / denominator;
if( t < 0 || t > 1 ) {
return nullptr;
}
return target.copy( direction ).multiplyScalar( t ).add( line.start );
}
bool Plane::intersectLine(const Line3& line, Vector3* result) const
{
const Vector3 direction = line.delta();
float denominator = normal().dot( direction );
if ( denominator == 0 ) {
// line is coplanar, return origin
if ( distanceToPoint( line.start() ) == 0 ) {
if (result) {
result->copy( line.start() );
}
return true;
}
// Unsure if this is the correct method to handle this case.
return false;
}
float t = - ( line.start().dot( normal() ) + constant() ) / denominator;
if( (t < 0 || t > 1) ) {
return false;
}
if (result)
result->copy( direction ).multiplyScalar( t ).add( line.start() );
return true;
}