internal static SCNVector3?UnprojectPointLocal(this ARSCNView self, CGPoint point, NMatrix4 planeTransform)
{
var result = self.Unproject(point, planeTransform);
// Convert the result into the plane's local coordinate system.
var pt = new SCNVector4(result.X, result.Y, result.Z, 1);
var invertedPlane = planeTransform.ToSCNMatrix4();
invertedPlane.Invert();
var localResult = invertedPlane.Times(pt);
return(localResult.Xyz);
}
