def look_at(self, vec=None, pos=None):
if pos is None:<EOL><INDENT>vec = Vector3(pos)<EOL><DEDENT>if vec is None:<EOL><INDENT>raise ValueError("<STR_LIT>")<EOL><DEDENT>return self._gl_look_at(self.position, vec, self._up)<EOL>
Look at a specific point

:param vec: Vector3 position
:param pos: python list [x, y, x]
:return: Camera matrix