def update(self, aspect_ratio=None, fov=None, near=None, far=None):
self.aspect_ratio = aspect_ratio or self.aspect_ratio<EOL>self.fov = fov or self.fov<EOL>self.near = near or self.near<EOL>self.far = far or self.far<EOL>self.matrix = Matrix44.perspective_projection(self.fov, self.aspect_ratio, self.near, self.far)<EOL>
Update the internal projection matrix based on current values
or values passed in if specified.

:param aspect_ratio: New aspect ratio
:param fov: New field of view
:param near: New near value
:param far: New far value